Swing Program
import java.awt.*;
import javax.swing.*;
Monday, January 7, 2008
Java Example Event Programming
Servelts Program
import java.io.*;
import javax.servlet.*;
import javax.servlet.http;
public class colorservlet extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException, HttpServletException
{
String color = request.getParameter("color");
res.setContentType("text/html");
PrintWriter pw = res.getWriter();
pw.println(" the selected color is ");
pw.println(color);
pw.close();
}
}
import java.io.*;
import javax.servlet.*;
public class serv1 extends GenericServlet
{
public void service (ServletRequest req, ServletResponse res) throws ServletException,IOException
{
res.setContentType("text/html");
PrintWriter pw = res.getWriter();
pw.println(" Hello Palani");
pw.close();
}
}
Java Example Event Programming
Important points
import java.rmi.* ; all methods in this package throws
RemoteException that must be caught.
Remote in interface indicates that this is remote interface,
the methods can be used by object in the remote machine.
Server extends UnicastRemoteObject implements
remote interface
Also import java.rmi.server.* for server program
Naming.rebind("servername", serverobject);
Others methods are bind , rebind, unbind
In client, Naming.lookup("rmi://ipaddress/servername") method is used to identify the server and returns remote interface. 6. Use inter.method to call the method in client.
Steps to exucute RMI
Write programs for interface, server and client and compile them.
javac inter.java
javac server.java
javac client.java or javac *.java
2. Then use rmi compiler to create stub and skeleton class.
rmic server
3. Copy inter, server, skeleton to server machine and
inter, client and stub to client program
4. Then start rmi registry by
start rmiregistry
5. Run the server program in server machine by
java server
6. Execute the client program by
java client ipaddress arg1 arg2
java client 200.200.1.120 5 8
import java.rmi.*;
public class client
{
public static void main(String arg[])
{
try
{
int a = Integer.parseInt(arg[1]);
int b = Integer.parseInt(arg[2]);
int result;
inter i = (inter) Naming.lookup("rmi://" + arg[0] + "/Addserver");
System.out.println("client");
i.getdata(a,b);
result = i.adddata();
System.out.println(result);
}
catch(Exception e)
{
System.out.println("error " + e);
}
}
}
/* Example for deserialization
ObjectInputStream(FileInputStream f)
*/
import java.io.*;
class myclass implements Serializable
{
String s;
int i;
int j;
myclass(String s1,int m,int n)
{
s=s1; i=m;j=n;
}
public String toString()
{
return (s + i + j);
}
}
class deser
{
public static void main(String arg[]) throws Exception
{
myclass ob2 ;
FileInputStream f = new FileInputStream("obj");
ObjectInputStream o = new ObjectInputStream(f);
ob2 = (myclass) o.readObject();
System.out.println(ob2.s + ob2.i);
o.close();
System.out.println("Obeject2 " + ob2);
}
}
import java.rmi.*;
public interface inter extends Remote
{
public void getdata(int m,int n) throws RemoteException;
int adddata() throws RemoteException;
}
/* Example for serialization
ObjectOutputStream(FileOutputStream f)
o.writeObject(ob)
*/
import java.io.*;
class myclass implements Serializable
{
String s;
int i;
int j;
myclass(String s1,int m,int n)
{
s=s1; i=m;j=n;
}
}
class ser
{
public static void main(String arg[]) throws IOException, NotSerializableException
{
myclass ob = new myclass("Murali",4,5);
FileOutputStream f = new FileOutputStream("obj");
ObjectOutputStream o = new ObjectOutputStream(f);
o.writeObject(ob);
o.flush();
o.close();
System.out.println(ob);
}
}
import java.rmi.*;
import java.rmi.server.*;
public class server extends UnicastRemoteObject implements inter
{
int x,y;
public server() throws RemoteException
{
}
public int adddata() throws RemoteException
{
return x+y;
}
public void getdata(int m, int n) throws RemoteException
{
x=m; y=n;
}
public static void main(String arg[])
{
try
{
server s = new server();
Naming.rebind("Addserver",s);
}
catch(Exception e)
{
System.out.println("Exception e");
}
}
}
import java.rmi.*;
import java.rmiregistry.*;
public class clientport
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == submit)
{
try
{
rmiserver server = (rmiserver) Naming.lookup("rmi//localhost/connect");
String name = getData();
}
catch(Exception e)
{
System.out.pritnln("Unable to connect");
}
}
}
}
import java.sql.*;
public class details
{
private Connection connect = null;
private Statement query =null;
private ResultSet result = null;
String dsn;
public details(String dsn)
{
this.dsn = "jdbc:odbc:" + dsn ;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
connect = DriverManager.getConnection(dsn,"","");
query = connect.createStatement();
}
catch(Exception e)
{
e.printStackTrace();
System.out.println("Connection failed");
}
}
public void setData(String Table, String data)
{
try
{
// String sql = "Insert into " + table + (name) values("'+data+'")";
String sql = "Insert into table(name) values('rrr')";
query.executeUpdate(sql);
}
catch(Exception e)
{
System.out.println("Query failed");
}
}
}
import java.rmi.*;
import java.rmi.server.*;
public class rmidatabase extends UnicastRemoteObject implements rmiserver
{
private details det=null;
public rmidatabase(String name) throws RemoteException
{
super();
try
{
Naming.rebind(name,this);
}
catch(Exception e)
{
System.out.println("Unable to bind");
}
det = new details("student");
}
public String receiveData(String s)
{
return null;
}
public void sendData(String data)
{
System.out.println("Server sending data");
det.sendData("registration",data);
}
public static void main(String a[])
{
try
{
System.setSecurityManager(new RMISecurityManager());
rmidatabase connect = new rmidatabase("connect");
System.out.println("Server started");
}
catch(Exception e)
{
System.out.println("Error in server");
}
}
}
import java.rmi.*;
interface rmiserver extends Remote
{
public void sendData(String data) throws RemoteException ;
public String receiveData(String data) throws RemoteException ;
}
Sunday, January 6, 2008
Java Example Event Programming
Remote Method Invocation [RMI]
allows object in one machine to use method in another machine
one method of creating distributed application
Layers in RMI
Stub/Skeleton Layer
Remote Reference Layer
Transport Layer
Client Server
Stub Skeleton
RRL RRL
Transport Layer Transport Layer
Example program to find the sum of 2 numbers using rmi
inter.java
import java.rmi.*;
public interface inter extends Remote
{
public void getdata(int m,int n) throws RemoteException;
int adddata() throws RemoteException;
}
server.java
import java.rmi.*;
import java.rmi.server.*;
public class server extends UnicastRemoteObject implements inter
{
int x,y;
public server() throws RemoteException
{
}
public int adddata() throws RemoteException
{
return x+y;
}
public void getdata(int m, int n) throws RemoteException
{
x=m; y=n;
}
public static void main(String arg[])
{
try
{
server s = new server();
Naming.rebind("Addserver",s);
}
catch(Exception e)
{
System.out.println("can not bund the name " + e);
}
}
}
client.java
import java.rmi.*;
public class client
{
public static void main(String arg[ ])
{
try
{
int a = Integer.parseInt(arg[1]);
int b = Integer.parseInt(arg[2]);
int result;
inter i = (inter) Naming.lookup("rmi://" + arg[0] +
"/Addserver");
System.out.println("client");
i.getdata(a,b);
result = i.adddata();
System.out.println(result);
}
catch(Exception e)
{
System.out.println("can not connect with server " + e);
}
}
}
Pack Programs
import pack.*;
class p
{
public static void main(String arg[])
{
pa p = new pa();
p.m();
}
}
package pack;
public class pa
{
public void m()
{
aa ob = new aa();
System.out.println(ob.a);
}
}
class aa
{
public int a=22;
}
import pack.*;
class pa1
{
public static void main(String arg[])
{
pa p = new pa();
p.m();
}
}
import pack.*;
class s
{
public static void main(String arg[])
{
sample ss = new sample();
ss.m();
c ss1 = new c();
System.out.println(ss1.a);
}
}
package pack;
import p.*;
public class sam
{
public void m()
{
c ob1 = new c();
// c1 ob2 = new c1();
// c2 ob3 = new c2();
ob2.m();
// ob2.m2();
System.out.println(ob1.a);
// System.out.println(ob1.b);
// System.out.println(ob1.c);
// System.out.println(ob1.d);
}
}
class c
{
public int a=55;
}
package pack;
public class sample
{
public void m()
{
c ob1 = new c();
System.out.println(ob1.a);
}
}
class c
{
public int a=55;
}
package p;
public class c
{
public int a=1;
private int b=2;
protected int c=3;
int d =4;
}
package p;
public class c1
{
public void m()
{
System.out.println("m method");
}
public void m1()
{
System.out.println("m1 method");
}
}
package p;
public class c2
{
public static void main(String arg[])
{
System.out.println("this is package");
}
}
interface i
{
final int a=33;
int b=44;
class c
{
}
public void m();
public void m1();
}
class int1 implements i
{
public void m()
{
}
public void m1()
{
}
public static void main(String arg[])
{
c ob = new c();
}
}
package p.p1;
public class c
{
public static void main(String arg[])
{
System.out.println("Subpackage");
}
}
Java Example Event Programming
Network Program
import java.net.*;
class dataclient
{
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void main(String args[]) throws Exception
{
ds = new DatagramSocket(1999);
while(true)
{
DatagramPacket p = new DatagramPacket(buffer,buffer.length);
ds.receive(p);
System.out.println(new String(p.getData(),0,p.getLength()));
}
}
}
import java.net.*;
class dataserver
{
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void main(String args[]) throws Exception
{
InetAddress ia = InetAddress.getByName(args[0]);
ds = new DatagramSocket(1666);
int pos=0;
while(true)
{
int c = System.in.read();
switch(c)
{
case 'q':
System.out.println("Server quits");
return;
case '\r':
break;
case '\n':
ds.send(new DatagramPacket(buffer,pos,ia,1999));
pos=0;
break;
default:
buffer[pos++] = (byte) c;
}
}
}
}
// a simple client that sends lines to server and reads lines from server
import java.net.*;
import java.io.* ;
public class tcpclient
{
public static void main(String arg[]) throws IOException
{
InetAddress addr;
if(arg.length > 0)
addr = InetAddress.getByName(arg[0]);
else
addr = InetAddress.getByName("localhost");
System.out.println("addr = " + addr);
Socket s = new Socket(addr,1666);
try
{
System.out.println("Socket = " + s);
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s.getOutputStream())),true);
for(int i =0;i<5;i++)
{
out.println("howdy " + i);
String str = in.readLine();
System.out.println(str);
}
out.println("End");
} finally
{
System.out.println("closing...");
s.close();
}
}
}
import java.io.* ;
import java.net.* ;
public class tcpserver
{
public static void main(String arg[]) throws IOException
{
ServerSocket ss = new ServerSocket(1666);
System.out.println("Server started " + ss);
try
{
Socket s = ss.accept();
try
{
System.out.println("Connection accepted " + s);
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
// output is flushed by printwriter
PrintWriter pw = new PrintWriter(new OutputStreamWriter(s.getOutputStream()),true);
while(true)
{
String str = br.readLine();
if(str.equals("End"))
break;
System.out.println("Echoing : " + str);
pw.println(str);
}
}
finally
{
System.out.println("closing ...");
s.close();
}
}
finally
{
ss.close();
}
}
}
import java.net.*;
class client
{
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void main(String arg[]) throws Exception
{
ds = new DatagramSocket(6);
while(true)
{
String a;
DatagramPacket p = new DatagramPacket(buffer,buffer.length);
ds.receive(p);
a=new String(p.getData(),p.getLength(),1);
if (a.equals("q"))
{
System.out.println("Server response is shut off now");
return;
}
System.out.println(new String(p.getData(),0,p.getLength()));
}
}
}
import java.net.*;
class dataclient
{
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void main(String args[]) throws Exception
{
ds = new DatagramSocket(1999);
while(true)
{
DatagramPacket p = new DatagramPacket(buffer,buffer.length);
ds.receive(p);
System.out.println(new String(p.getData(),0,p.getLength()));
}
}
}
import java.net.*;
class dataserver
{
public static int serverport = 1666;
public static int clientport = 1999;
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void server() throws Exception
{
int pos=0;
while(true)
{
int c = System.in.read();
switch(c)
{
case -1:
System.out.println("Server quits");
return;
case '\r':
break;
case '\n':
ds.send(new DatagramPacket(buffer,pos,InetAddress.getLocalHost(),clientport));
pos=0;
break;
default:
buffer[pos++] = (byte) c;
}
}
}
public static void client() throws Exception
{
while(true)
{
DatagramPacket p = new DatagramPacket(buffer,buffer.length);
ds.receive(p);
System.out.println(new String(p.getData(),0,p.getLength()));
}
}
public static void main(String args[]) throws Exception
{
if(args.length ==1)
{
ds = new DatagramSocket(serverport);
server();
}
else
{
ds = new DatagramSocket(clientport);
client();
}
}
}
import java.net.*;
class inet
{
public static void main(String arg[]) throws UnknownHostException,MalformedURLException
{
InetAddress b = InetAddress.getLocalHost();
System.out.println(b);
String s = b.getHostAddress();
System.out.println(s);
InetAddress c = InetAddress.getByName(arg[0]);
System.out.println(c);
URL u = new URL("file:/j:/j002");
}
}
import java.net.*;
class server
{
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void main(String a[]) throws Exception
{
InetAddress ia = InetAddress.getByName("tmproj13");
System.out.print("Connect to ");
System.out.println(ia);
ds = new DatagramSocket(123);
int pos=0;
while(true)
{
int c = System.in.read();
switch(c)
{
case 'q':
System.out.println("Server quits");
return;
case '\r':
break;
case '\n':
DatagramPacket dp = new DatagramPacket(buffer,pos,ia,456);
ds.send(dp);
pos=0;
break;
default:
buffer[pos++] = (byte) c;
}
}
}
}
// a simple client that sends lines to server and reads lines from server
import java.net.*;
import java.io.* ;
public class tcpclient
{
public static void main(String arg[]) throws IOException
{
InetAddress addr = InetAddress.getByName(null);
// instead of null you can use localhost
System.out.println("addr = " + addr);
Socket s = new Socket(addr,tcpserver.port);
try
{
System.out.println("Socket = " + s);
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s.getOutputStream())),true);
for(int i =0;i<10;i++)
{
out.println("howdy " + i);
String str = in.readLine();
System.out.println(str);
}
out.println("End");
} finally{
System.out.println("closing...");
s.close();
}
}
}
import java.io.* ;
import java.net.* ;
public class tcpserver
{
public static final int port=8080;
public static void main(String arg[]) throws IOException
{
ServerSocket ss = new ServerSocket(port);
Socket s ;
System.out.println("Server started " + ss);
try {
s = ss.accept();
System.out.println("Connection accepted " + s);
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
// output is flushed by printwriter
PrintWriter pw = new PrintWriter(new OutputStreamWriter(s.getOutputStream()),true);
while(true)
{
String str = br.readLine();
if(str.equals("stop"))
break;
System.out.println("Echoing : " + str);
pw.println(str);
}
}finally {
System.out.println("closing ...");
s.close();
ss.close();
}}}
import java.net.*;
class udpclient
{
public static int serverport = 666;
public static int clientport = 999;
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void client() throws Exception
{
while(true)
{
DatagramPacket p = new DatagramPacket(buffer,buffer.length);
ds.receive(p);
System.out.print(new String(p.getData(),0,p.getLength()));
}
}
public static void main(String args[]) throws Exception
{
ds = new DatagramSocket(clientport);
client();
}
}
import java.net.*;
class udpserver
{
public static int serverport = 666;
public static int clientport = 999;
public static DatagramSocket ds;
public static byte buffer[] = new byte[1024];
public static void server() throws Exception
{
int pos=0;
while(true)
{
InetAddress ia = InetAddress.getByName("rad-tm-17");
int c = System.in.read();
ds.send(new DatagramPacket(buffer,pos,ia,clientport));
pos=0;
buffer[pos++] = (byte) c;
}
}
public static void main(String args[]) throws Exception
{
ds = new DatagramSocket(serverport);
server();
}}
Java Example Event Programming
JDBC Program
import java.sql.*;
import java.sql.Types.*;
import java.util.*;
import java.io.*;
class callstatapp
{
public static final int VARCHAR=2;
public static void main(String args[])
{
try
{
String st;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
Connection con=DriverManager.getConnection(url,"palani","kumar");
CallableStatement cst;
cst=con.prepareCall("?=call fun");
con.close();
cst.registerOutParameter(1,VARCHAR);
st=cst.getString(1);
System.out.println("The result is "+st);
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
}
import java.sql.*;
import java.util.*;
class connecapp
{
public static void main(String sarg[])
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
Connection con=DriverManager.getConnection(url);
DatabaseMetaData meta=con.getMetaData();
System.out.println("database : "+meta.getDatabaseProductName());
System.out.println("version : "+meta.getDatabaseProductVersion());
System.out.println("username : "+meta.getUserName());
con.close();
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
}
import java.sql.*;
class dbcon
{
static Connection con;
public static void main(String a[ ]) throws Exception
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
try
{
con = DriverManager.getConnection("jdbc:odbc:empdsn","palani","kumar");
System.out.println("Connected to database");
Statement s = con.createStatement();
int rows = s.executeUpdate("Insert into emp values(110,'murali1',19000)");
System.out.println(rows + " rows inserted");
rows = s.executeUpdate("Update emp set salary=1200 where empid=120");
System.out.println(rows + " rows updated");
s.close();
con.close();
}
catch(SQLException e)
{
System.out.println("not Connected to database"+ e);
}
}
}
import java.sql.*;
class dbcon1
{
static Connection con;
public static void main(String a[ ]) throws Exception
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
try
{
con = DriverManager.getConnection("jdbc:odbc:odbcoracle","palani","kumar");
System.out.println("Connected to database");
Statement s = con.createStatement();
int rows = s.executeUpdate("create table runtt (sno number, sname varchar2(20))");
System.out.println(rows + " table created");
s.close();
con.close();
}
catch(SQLException e)
{
System.out.println("not Connected to database"+ e);
}
}
}
import java.sql.*;
import java.util.*;
class driverapp
{
public static void main(String args[])
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Enumeration drivers=DriverManager.getDrivers();
System.out.println("The list of drivers in the system");
while(drivers.hasMoreElements())
{
Driver driver=(Driver)drivers.nextElement();
System.out.println("Driver: "+driver.getClass().getName());
System.out.println("Major version: "+driver.getMajorVersion());
System.out.println("Minor version: "+driver.getMinorVersion());
System.out.println("JDBC complaint: "+driver.jdbcCompliant());
DriverPropertyInfo props[]=driver.getPropertyInfo(" ",null);
if(props!=null)
{
System.out.println("The list of properties");
for(int i=0;i less than props.length;i++)
{
System.out.println(" Name : "+props[i].name);
System.out.println(" Description : "+props[i].description);
System.out.println(" value : "+props[i].value);
if(props[i].choices!=null)
{
System.out.println("The list of choices");
for(int j=0;i less than props[i].choices.length;j++)
System.out.println(" "+props[i].choices[j]);
}
System.out.println("requires :"+props[i].required);
}
}
}
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
}
import java.sql.*;
import java.util.*;
import java.io.*;
class prestat
{
public static void main(String args[])
{
int i=1;
try
{
String no;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
Connection con=DriverManager.getConnection(url,"palani","kumar");
PreparedStatement pst;
ResultSet rs;
boolean hasResults;
while(i<=2)
{
pst=con.prepareStatement("insert into tt values(?)");
System.out.println("\n Enter the employee no needed");
no=br.readLine();
System.out.println("\n The employee number chosen is "+no);
pst.setString(1,no);
hasResults=pst.execute();
if(hasResults)
{
rs=pst.getResultSet();
if(rs!=null)
disp(rs);
hasResults=false;
}
i=i+1;
}
con.close();
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
static void disp(ResultSet r) throws SQLException
{
System.out.print(r.getString(1));
boolean m =r.next();
System.out.print(r.getString(1));
}
}
}
import java.sql.*;
import java.util.*;
import java.io.*;
class prestatapp
{
public static void main(String args[])
{
int i=1;
try
{
String no;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
Connection con=DriverManager.getConnection(url,"palani","kumar");
PreparedStatement pst;
ResultSet rs;
boolean hasResults;
while(i<=3)
{
pst=con.prepareStatement("insert into tt values(?)");
System.out.println("\n Enter the employee no needed");
no=br.readLine();
System.out.println("\n The employee number chosen is "+no);
pst.setString(1,no);
hasResults=pst.execute();
if(hasResults)
{
rs=pst.getResultSet();
if(rs!=null)
disp(rs);
hasResults=false;
}
i=i+1;
}
con.close();
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
static void disp(ResultSet r) throws SQLException
{
ResultSetMetaData rmeta=r.getMetaData();
int numcol=rmeta.getColumnCount();
for(int i=1;i less than numcol;++i)
System.out.print(rmeta.getColumnName(i));
while(r.next())
{
for(int i=1;i less than numcol;++i)
System.out.print(r.getString(i));
}
}
}
import java.sql.*;
import java.util.*;
class resulapp
{
public static void main(String sarg[])
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
Connection con=DriverManager.getConnection(url,"palani","kumar");
Statement st=con.createStatement();
String sql="select * from emp";
ResultSet rs=st.executeQuery(sql);
disp(rs);
con.close();
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
static void disp(ResultSet r) throws SQLException
{
ResultSetMetaData rmeta=r.getMetaData();
int numcol=rmeta.getColumnCount();
for(int i=1;i<=numcol;++i)
System.out.print(rmeta.getColumnName(i)+"\t");
Sytem.out.print("\n");
while(r.next())
{
for(int i=1;i<=numcol;++i)
System.out.print(r.getString(i)+ "\t" );
System.out.print("\n");
}
}
}
import java.sql.*;
import java.util.*;
class statapp
{
public static void main(String args[])
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
Connection con=DriverManager.getConnection(url,"palani","kumar");
Statement st=con.createStatement();
String sql=args[0];
System.out.println(sql);
boolean hasResults=st.execute(sql);
if(hasResults)
{
ResultSet rs=st.getResultSet();
if(rs!=null)
disp(rs);
}
con.close();
}
catch(Exception ex)
{
System.out.println(ex);
System.exit(0);
}
}
static void disp(ResultSet r) throws SQLException
{
ResultSetMetaData rmeta=r.getMetaData();
int numcol=rmeta.getColumnCount();
for(int i=1;iless than numcol;++i)
System.out.print(rmeta.getColumnName(i));
while(r.next())
{
for(int i=1;i less than numcol;++i)
System.out.print(r.getString(i));
}
}
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
/* Table emp in oracle user palani columns eno ename sal */
class fram extends JFrame implements ActionListener
{
TextField txteno, txtename, txtsal ;
JLabel lbleno, lblename, lblsal, lblstat ;
Container cp;
Connection con;
Statement st;
JButton butinsert;
fram()
{
txteno = new TextField(12);
txtename = new TextField(12);
txtsal = new TextField(12);
lbleno = new JLabel("Empno ");
lblename= new JLabel("Ename ");
lblsal = new JLabel("salary");
lblstat = new JLabel("");
butinsert = new JButton("Insert");
cp = this.getContentPane();
cp.setLayout(new FlowLayout());
cp.add(lbleno);
cp.add(txteno);
cp.add(lblename);
cp.add(txtename);
cp.add(lblsal);
cp.add(txtsal);
cp.add(butinsert);
cp.add(lblstat);
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:odbcoracle";
con=DriverManager.getConnection(url,"palani","kumar");
lblstat.setText("successfully connected");
st=con.createStatement();
}
catch(Exception ex)
{
System.out.println("Cannot connect " + ex);
}
butinsert.addActionListener(this);
addWindowListener(new w(this));
}
class w extends WindowAdapter
{
fram f1;
w(fram f2)
{
f1 = f2;
}
public void windowClosing(WindowEvent we)
{
f1.setVisible(false);
f2.dispose();
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == butinsert)
{
try
{
int rows = st.executeUpdate("insert into emp values(121,'melvin',5500)");
lblstat.setText(rows+ "inserted");
} catch(SQLException se) { }
}
}
}
class swodbc
{
public static void main(String arg[])
{
fram f = new fram();
f.setVisible(true);
f.setSize(400,400);
f.setLocation(200,200);
}
}
Java Example Event Programming
Infterface Program
interface callback
{
void callback(int param);
}
class imp2 implements callback
{
public void callback(int p)
{
System.out.println("callback called with " + p);
}
}
class imp1
{
public static void main(String a[])
{
callback c = new imp2();
c.callback(42);
}
}
class imp3 implements callback
{
public void callback(int t)
{
System.out.println("Interface");
}
public static void main(String a[])
{
imp3 i = new imp3();
i.callback(6);
}
}
class int1 implements inter
{
public void m()
{
}
}
public interface inter
{
public void m();
}
import java.io.*;
class read
{
public static void main(String a[]) throws IOException
{
char c;
InputStreamReader i = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
c = (char) br.read();
System.out.println(c);
c = (char) i.read();
System.out.println(c);
}
}
import java.io.*;
class read1
{
public static void main(String a[]) throws IOException
{
char c;
String s;
InputStreamReader i = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("press chars");
do
{
s = br.readLine();
System.out.println(s);
}while(!s.equals("stop"));
System.out.println("press chars");
do
{
// s = i.readLine();
System.out.println(s);
} while(!s.equals("stop"));
}
}
import java.io.*;
class fileread
{
public static void main(String a[]) throws IOException
{
int i;
FileInputStream fin;
try{
fin = new FileInputStream(a[0]);
}
catch(FileNotFoundException e)
{
System.out.println("File not found");
return ;
}
do
{
i = fin.read();
if(i != -1)
System.out.print((char) i);
}
while(i!= -1);
fin.close();
}
}
import java.io.*;
class files
{
public static void main(String arg[])
{
File f = new File ("c.c");
System.out.println("File Name : " + f.getName());
System.out.println(f.getPath());
System.out.println(f.getAbsolutePath());
String s;
s = (f.canRead()? "is readable" : "is writable");
System.out.println(s);
s = (f.isDirectory()? "dir" : "not dir");
System.out.println(s);
s = (f.isFile()? "file" : "not file");
System.out.println(s);
boolean b = f.delete();
}
}
import java.io.*;
class filewrite
{
public static void main(String a[]) throws IOException,FileNotFoundException
{
FileOutputStream fin = new FileOutputStream(a[0]);
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
// int i = br.read();
String str = br.readLine();
byte[] b = str.getBytes();
fin.write(b);
System.out.print("Stored in the file");
fin.close();
}
}
import java.io.*;
class filewrite
{
public static void main(String a[]) throws IOException,FileNotFoundException
{
FileOutputStream fin = new FileOutputStream(a[0]);
BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
InputStreamReader br2 = new InputStreamReader(System.in));
// int i = br.read();
byte b = br.read();
byte b1 = br2.read();
String str = br.readLine();
// byte[] b = str.getBytes();
fin.write(b);
System.out.print("Stored in the file");
fin.close();
}
}
import java.io.*;
class in
{
public static void main(String arg[]) throws Exception
{
System.out.println("enter a number");
char c =(char) System.in.read();
System.out.println(c);
}
}
import java.io.*;
class pw
{
public static void main(String a[])
{
PrintWriter pw = new PrintWriter(System.out,true);
pw.print("this is the string");
int i=9;
pw.println(i);
double d=34.34;
pw.println(d);
System.out.write('e');
// System.out.write('lle');
System.out.write('\n');
}
}
import java.io.*;
class read
{
public static void main(String a[]) throws IOException,FileNotFoundException
{
int i;
FileInputStream fin = new FileInputStream(a[0]);
do
{
i = fin.read();
if(i != -1)
System.out.print((char) i);
}
while(i!= -1);
fin.close();
}
}
import java.io.*;
class reader
{
public static void main(String a[]) throws IOException
{
char c;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter characters . q to quit");
do
{
c = (char) br.read();
System.out.println(c);
}while(c!= 'q');
}
}
import java.io.*;
class reader1
{
public static void main(String a[]) throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str;
System.out.println("Enter 'stop' to quit");
do
{
str = br.readLine();
System.out.println(str);
}while(!str.equals("stop"));
}
}
class str
{
public static void main(String a[])
{
StringBuffer s1 = new StringBuffer();
StringBuffer s2 = new StringBuffer(12);
StringBuffer s3 = new StringBuffer("palani");
System.out.println(s1.length() +" "+ s2.length() +" " + s3.length());
String s4 ="kumar" ;
String s5 = s4;
s2.append("Radiant");
System.out.println(s4.toUpperCase());
System.out.println(s1.length() +" "+ s2.length() +" " + s3.length());
System.out.println("substring " + s3.substring(3,3));
s3.append("kumar");
System.out.println(s3);
System.out.println(s2.reverse());
System.out.println(s2.delete(2,2));
}
}
Java Example Event Programming
Inh Program
class aa
{
public int a = 11;
private int b = 22;
int c = 33;
protected int d =44;
}
class bb extends aa
{
public void disp()
{
System.out.println(a);
// System.out.println(b);
System.out.println(c);
System.out.println(d);
}
}
class access
{
public static void main(String arg[])
{
bb ob = new bb();
ob.disp();
}
}
class a
{
a()
{
System.out.println("A 's constructor");
}
public void m()
{
System.out.println("a 's method");
}
}
class b extends a
{
b()
{
super();
System.out.println("B's constructor");
super.m();
}
public void a()
{
System.out.println("overrided a");
}
}
class inh1
{
public static void main(String a[])
{
b bb = new b();
}
}
class over
{
public void m()
{
}
public void m(int a)
{
}
public void m(float a)
{
}
public int m(int a)
{
return a;
}
}
class methover
{
public static void main(String arg[])
{
over o = new o();
o.m();
o.m(4);
o.m(9.4f);
int d = o.m(5);
}
}
Java Example Event Programming
Exception Program
class myexception extends Exception
{
public String toString()
{
return "Myexception caught. A should be greater than 10";
}
}
class ex
{
public static void main(String arg[]) throws Exception
{
int a = Integer.parseInt(arg[0]);
if(a<10)
throw new myexception();
System.out.println("A is correct");
}
}
class myexception extends Exception
{
public String getMessage()
{
return "Myexception caught. A should be greater than 10";
}
}
class ex1
{
public static void main(String arg[]) throws Exception
{
int a = Integer.parseInt(arg[0]);
if(a<10)
throw new myexception();
System.out.println("A is correct");
}
}
class ex3
{
public static void main(String a[])
{
int m = Integer.parseInt(a[0]);
int n = Integer.parseInt(a[1]);
int r = m/n;
int k;
System.out.println(r);
// System.out.println(k);
}
}
class ex4
{
public static void main(String a[])
{
int m = Integer.parseInt(a[0]);
int n = Integer.parseInt(a[1]);
try
{
int r = m/n;
}
catch(ArithmeticException e)
{
System.out.println("div by zero");
}
catch(Exception e)
{ System.out.println("general");
}
finally
{
System.out.println("finally");
}
System.out.println("Successfull");
int k;
// System.out.println(r);
// System.out.println(k);
}
}
class A
{
A()
{ System.out.println("A 's constructor");}
}
class B extends A
{
public void A()
{ System.out.println("B 's constructor");}
B()
{
super();
}
}
class C extends B
{
C()
{ System.out.println("C 's constructor");}
}
class ext1
{
public static void main(String a[])
{
C cc = new C();
}
}
Java Example Event Programming
Book Program
class x
{
int a;
float f;
}
class y extends x
{
double c;
}
class clas
{
public static void main(String arg[])
{
x xx = new x();
y yy = new y();
Class ob;
ob = xx.getClass();
System.out.println("xx is object of type : " + ob.getName());
ob = yy.getClass();
System.out.println("yy is object of type : " + ob.getName());
ob = ob.getSuperclass();
System.out.println("y's superclass is : " + ob.getName());
}
}
class disp
{
public static void main(String a[])
System.out.println(a[i]);
}
}
}
class init
{
public static void main(String[] arg)
{
int k;
int n=!1;
System.out.println(n);
System.out.println(arg[0]);
}
}
class out
{
int i=20;
private int j=30;
public int k =40;
protected int l=50;
public void m()
{
in inn = new in();
inn.inmethod();
}
public void mpu()
{
System.out.println("Pub");
}
public void mpr()
{
System.out.println("Pri");
}
void mde()
{
System.out.println("default");
}
class in
{
int j=10;
public void inmethod()
{
System.out.println("Inner method" + (i+j+k+l));
mpr();
mpu();
mde();
System.out.println("this j"+j);
// m();
}
}
}
class inner
{
public static void main(String arg[])
{
out o = new out();
o.m();
}
}
class math
{
public static void main(String arg[])
{
System.out.println(Math.random());
System.out.println(Math.E);
System.out.println(Math.PI);
System.out.println(4^5);
}
}
class mem
{
public static void main(String arg[])
{
Runtime r = Runtime.getRuntime();
long mem1,mem2;
int i;
Integer in[] = new Integer[1000];
System.out.println("total memory " + r.totalMemory());
mem1 = r.freeMemory();
System.out.println("Free memory " + mem1);
r.gc();
mem1 = r.freeMemory();
System.out.println("Free memory after garbage " + mem1);
for(i=0;i<1000;i++)
in[i] = new Integer(i);
mem2 = r.freeMemory();
System.out.println("Free memory after decl" + mem2);
System.out.println("diff " + (mem1-mem2));
r.gc();
r.gc();
r.gc();
mem2 = r.freeMemory();
System.out.println("Free memory after gc " + mem2);
}
}
class meth
{
public static void p(String s)
{
System.out.println(s);
}
static
{
p("hello");
}
public static void main(String a[])
{
p("hi");
char k='f';
switch(k)
{
case 'f' :
p("true");
break;
case 'a':
p("false");
break;
default :
p("default");
}
}
}
public class priclass
{
public static void main(String a[])
{
a ob1 = new a();
b ob2 = new b();
c ob3 = new c();
}
}
protected class a
{
public int k=33;
}
class b
{
public int j=23;
}
public class c
{
public int i=24;
}
class quest
{
public static void main(String arg[])
{
int i=7,j=8;
int n=(ij) % (i & j) ;
System.out.println(n);
}
}
/* static class s
{
System.out.println("hi");
}
*/
static class statclass
{
public static void main(String arg[])
{
s ss = new s();
}
}
import java.util.*;
class test19
{
public static void main(String g[])
{
Vector v = new Vector();
v.add("Radiant");
v.add("Software");
System.out.println(v.elementAt(0) + v.elementAt(1));
}
}
Java Example Event Programming
Applet Program
import java.awt.*;
import java.applet.*;
public class appcolor extends Applet
{
public void init()
{
setBackground(Color.yellow);
}
public void paint(Graphics g)
{
g.drawString("Applet ",10,10);
g.setColor(Color.red);
g.drawString("This is red color",20,10);
g.setColor(Color.magenta);
g.drawString("Magenta",30,10);
g.setColor(Color.blue);
g.drawString("Blue",40,10);
g.setColor(Color.green);
g.drawString("Green",30,10);
}
}
import java.awt.*;
import java.applet.*;
public class borderlay extends Applet
{
public void init()
{
BorderLayout f = new BorderLayout();
setLayout(f);
Button b1 = new Button("Left-West");
Button b2 = new Button("Footer-south");
Button b3 = new Button("PALANI");
Button b4 = new Button("Right-East");
Button b5 = new Button("Top-North");
Button b6 = new Button("RADIANT");
add(b1,BorderLayout.WEST);
add(b2,BorderLayout.SOUTH);
add(b3,BorderLayout.CENTER);
add(b4,BorderLayout.EAST);
add(b5,BorderLayout.NORTH);
add(b6,BorderLayout.CENTER);
TextField t = new TextField();
add(t,BorderLayout.CENTER);
}
public Insets getInsets()
{
return new Insets(10,10,10,10);
}
}
import java.awt.*;
import java.applet.*;
public class butt extends Applet
{
public void init()
{
Label one = new Label("mouse");
Label two = new Label();
Label three = new Label("HCL",Label.CENTER);
add(one);
add(two);
add(three);
two.setText("visible");
add(two);
Button b1 = new Button("One");
Button b2 = new Button("Two");
add(b1);
add(b2);
Checkbox c1 = new Checkbox("Required");
Checkbox c2 = new Checkbox();
add(c1);
add(c2);
CheckboxGroup cg = new CheckboxGroup();
Checkbox c3 = new Checkbox("PentiumIII",true,cg);
Checkbox c4 = new Checkbox("Machintosh",false,cg);
Checkbox c5 = new Checkbox("487 machine",cg,false);
add(c3);
add(c4);
add(c5);
}
}
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class card extends Applet implements ActionListener , MouseListener
{
String s="PP";
CardLayout c;
Button one,two;
Panel p,p1,p2;
Checkbox ch,ch1,ch2,ch3;
public void init()
{
one = new Button("one");
two = new Button("two");
add(one);
add(two);
c = new CardLayout();
p = new Panel();
p.setLayout(c);
ch = new Checkbox("Required");
ch1 = new Checkbox("Enable");
p1 = new Panel();
p1.add(ch);
p1.add(ch1);
ch2 = new Checkbox("Required");
ch3 = new Checkbox("Enable");
p2 = new Panel();
p2.add(ch2);
p2.add(ch3);
p.add(p1,"First pane");
p.add(p2,"Second pane");
add(p);
one.addActionListener(this);
two.addActionListener(this);
addMouseListener(this);
}
public void paint(Graphics g)
{
g.drawString(s,100,100);
}
public void mouseClicked(MouseEvent e)
{
}
public void mouseEntered(MouseEvent e)
{
}
public void mousePressed(MouseEvent e)
{
c.next(p);
s="fired";
repaint();
}
public void mouseExited(MouseEvent e)
{
}
public void mouseReleased(MouseEvent e)
{
}
public void actionPerformed(ActionEvent a)
{
if(a.getSource() == one)
{
c.show(p,"First pane");
}
else
{
c.show(p,"Second pane");
}
}
}
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class cardlay extends Applet implements ActionListener , MouseListener
{
CardLayout c;
Button one,two;
Panel p,p1,p2;
Checkbox ch,ch1,ch2,ch3;
public void init()
{
one = new Button("one");
two = new Button("two");
add(one);
add(two);
c = new CardLayout();
p = new Panel();
p.setLayout(c);
ch = new Checkbox("Required");
ch1 = new Checkbox("Enable");
p1 = new Panel();
p1.add(ch);
p1.add(ch1);
ch2 = new Checkbox("Required");
ch3 = new Checkbox("Enable");
p2 = new Panel();
p2.add(ch2);
p2.add(ch3);
p.add(p1,"First");
p.add(p2,"Second");
add(p);
one.addActionListener(this);
two.addActionListener(this);
addMouseListener(this);
}
public void mouseClicked(MouseEvent e)
{
}
public void mouseEntered(MouseEvent e)
{
}
public void mousePressed(MouseEvent e)
{
c.next(p);
}
public void mouseExited(MouseEvent e)
{
}
public void mouseReleased(MouseEvent e)
{
}
public void actionPerformed(ActionEvent a)
{
if(a.getSource() == one)
{
c.show(p,"First");
}
else
{
c.show(p,"Second");
}
}
}
import java.applet.*;
import java.awt.*;
public class cho extends Applet
{
public void init()
{
Choice ch = new Choice();
ch.add("One");
ch.add("Two");
ch.addItem("Three");
ch.addItem("Four");
add(ch);
List l = new List();
l.add("One");
l.add("Two");
l.addItem("Three");
l.addItem("Four");
add(l);
List l1 = new List(3);
l1.add("One");
l1.add("Two");
l1.addItem("Three");
l1.addItem("Four");
add(l1);
List l2 = new List(3,true);
l2.add("One");
l2.add("Two");
l2.addItem("Three");
l2.addItem("Four");
add(l2);
Scrollbar s1 = new Scrollbar();
Scrollbar s2 = new Scrollbar(Scrollbar.HORIZONTAL);
Scrollbar s3 = new Scrollbar(Scrollbar.VERTICAL,10,1,1,100);
add(s1);
add(s2);
add(s3);
}
}
import java.applet.*;
import java.awt.*;
public class cho1 extends Applet
{
public void init()
{
Choice ch = new Choice();
ch.add("One");
ch.add("Two");
ch.add("Three");
ch.add("Four");
add(ch);
List l = new List();
l.add("One");
l.add("Two");
l.add("Three");
l.add("Four");
add(l);
List l1 = new List(3);
l1.add("One");
l1.add("Two");
l1.add("Three");
l1.add("Four");
add(l1);
List l2 = new List(3,true);
l2.add("One");
l2.add("Two");
l2.add("Three");
l2.add("Four");
add(l2);
}
}
import java.applet.*;
import java.awt.*;
public class colors extends Applet
{
public void paint(Graphics g)
{
g.setFont(new Font("Arial",Font.BOLD,20));
g.drawString("Default color",10,10);
g.setColor(Color.red.green.yellow.red.cyan);
g.drawString("Find the color",10,30);
g.setColor(Color.pink);
g.drawString("Pink color",10,50);
g.setColor(Color.cyan);
g.drawString("Cyan color",10,70);
g.fillArc(80,80,120,120,0,90);
g.drawString("Squiggle #9",10,130);
}
}
import java.awt.*;
import java.applet.*;
public class draw1 extends Applet
{
public void paint(Graphics g)
{
g.drawOval(60,60,120,120);
g.fillOval(90,120,50,20);
g.drawLine(165,125,165,175);
g.drawArc(110,130,95,95,0,-185);
g.drawLine(165,175,150,160);
}
}
import java.awt.*;
import java.applet.*;
public class draw2 extends Applet
{
public void paint(Graphics g)
{
g.setColor(Color.red);
g.fillOval(205,60,30,30);
g.setColor(Color.orange);
g.fillRoundRect(180,90,80,80,20,20);
g.setColor(Color.blue);
g.fillRect(198,168,10,70);
g.fillRect(228,168,10,70);
g.fillRect(140,80,10,40);
g.fillRect(290,115,10,40);
g.fillRect(260,115,40,10);
g.fillRect(140,115,40,10);
g.setColor(Color.magenta);
g.drawString("Had fun",10,30);
}
}
import java.awt.*;
import java.applet.*;
public class drawstr extends Applet
{
String s;
public void init()
{
s = "Welcome to Java" ;
}
public void paint(Graphics g)
{
g.drawString(s,100,100);
}
}
import java.awt.*;
import java.applet.*;
public class flowlay extends Applet
{
public void init()
{
// FlowLayout f = new FlowLayout(FlowLayout.RIGHT);
FlowLayout f = new FlowLayout(0,10,10);
setLayout(f);
Button b1 = new Button("One");
Button b2 = new Button("One");
Button b3 = new Button("One");
Button b4 = new Button("One");
Button b5 = new Button("One");
add(b1);
add(b2);
add(b3);
}
}
import java.awt.*;
import java.applet.*;
public class fonts extends Applet
{
Font f1,f2 ,f3;
public void init()
{
Font f1 = new Font("Courier",Font.BOLD,8);
Font f2 = new Font("Times Roman",Font.ITALIC,15);
Font f3 = new Font("Arial",Font.PLAIN,22);
}
public void paint(Graphics g)
{
g.setColor(Color.red);
g.drawString("Normal font",20,10);
g.setFont(f1);
g.setColor(Color.green);
g.drawString("Courier font",20,60);
g.setFont(f2);
g.setColor(Color.blue);
g.drawString("Times Roman",20,110);
g.setFont(f3);
g.setColor(Color.magenta);
g.drawString("Arial font",20,160);
}
}
import java.awt.*;
import java.applet.*;
public class graph extends Applet
{
public void paint(Graphics g)
{
setBackground(Color.pink);
g.drawLine(10,10,10,200);
g.drawString("Palani",130,130);
g.drawRect(50,50,120,120);
g.setColor(Color.red);
g.drawRoundRect(150,150,250,250,30,30);
g.fillRect(270,270,50,50);
g.draw3DRect(300,300,10,10,true);
}
}
import java.awt.*;
import java.applet.*;
public class gridlay extends Applet
{
public void init()
{
GridLayout f = new GridLayout(6,6,1,1);
setLayout(f);
Button b1 = new Button("One");
Button b2 = new Button("One");
Button b3 = new Button("One");
Button b4 = new Button("One");
Button b5 = new Button("One");
add(b1);
add(b2);
add(b3);
add(b4);
add(b5);
}
}
import java.applet.*;
import java.awt.*;
public class img extends Applet
{
Image i;
public void init()
{
i = getImage(getCodeBase(),"fish.gif");
}
public void paint(Graphics g)
{
g.drawImage(i,10,10,this);
}
}
import java.awt.*;
import java.applet.*;
public class order extends Applet
{
String s ;
public void init()
{
s = " Init " ;
}
public void start()
{
s = s + " start ";
}
public void paint(Graphics g)
{
s = s + " paint ";
g.drawString(s,100,100);
}
public void stop()
{
repaint();
s = "null";
}
}
import java.applet.*;
import java.awt.*;
public class param extends Applet
{
String str;
public void init()
{
str=getParameter("n");
setBackground(Color.cyan);
str="hai " + str + "How are you";
}
public void paint(Graphics g)
{
g.drawString(str,20,20);
}
}
import java.applet.*;
import java.awt.*;
public class poly extends Applet
{
int xp[]={10,20,30};
int yp[]={10,20,30};
int n =3;
public void paint(Graphics g)
{
g.drawPolygon(xp,yp,n);
}
}
Java Example Event Programming
>>PREVIOUS>>
Frame Program
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class frammenu extends Frame implements ActionListener
{
MenuBar mb; Menu m1,m2 ;
MenuItem mi1,mi2,mi3,mi4;
public void init()
{
mb = new MenuBar();
m1 = new Menu("File");
m2 = new Menu("Color");
mi1 = new MenuItem("Exit");
mi2 = new MenuItem("Blue");
mi3 = new MenuItem("Red");
mi4 = new MenuItem("Green");
mi1.addActionListener(this);
mi2.addActionListener(this);
mi3.addActionListener(this);
mi4.addActionListener(this);
m1.add(mi1);
m2.add(mi2); m2.add(mi3); m2.add(mi4);
mb.add(m1); mb.add(m2);
setMenuBar(mb);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource() == mi2)
setBackground(Color.blue);
if(ae.getSource() == mi3)
setBackground(Color.red);
}
}
public class colormenu extends Applet
{
public void init()
{
Frame f = new frammenu();
f.setSize(400,400);
f.setVisible(true);
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class fra extends Frame
{
fra()
{
super("frame title");
winadapt w = new winadapt(this);
addWindowListener(w);
}
public void paint(Graphics g)
{
g.drawString("This is frame",100,100);
}
}
class winadapt extends WindowAdapter
{
fra f1;
public winadapt(fra f2)
{
f1 = f2;
}
public void windowClosing(WindowEvent e)
{
f1.setVisible(false);
}
}
class filedia
{
public static void main(String a[])
{
Frame f = new fra();
f.setSize(300,300);
f.setVisible(true);
FileDialog fd = new FileDialog(f,"File dialog");
fd.setVisible(true);
String ffile=fd.getFile();
String fdir=fd.getDirectory();
System.out.println("file " + ffile+" " + fdir);
}
}
import java.awt.*;
import java.applet.*;
public class frame1 extends Applet
{
Frame f;
public void init()
{
f = new Frame();
f.setSize(100,100);
f.setVisible(true);
}
public void paint(Graphics g)
{
g.drawString("this is applet",10,10);
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class fra extends Frame
{
public void paint(Graphics g)
{
g.setColor(Color.blue);
g.drawString("This is frame",50,50);
g.drawLine(50,50,100,50);
g.fillOval(100,100,50,50);
}
}
public class frame2 extends Applet
{
Frame f;
public void init()
{
f = new fra();
f.setSize(100,100);
f.setVisible(true);
}
public void paint(Graphics g)
{
g.drawString("this is applet",10,10);
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class fra extends Frame
{
fra()
{
super("frame title");
winadapt w = new winadapt(this);
addWindowListener(w);
}
public void paint(Graphics g)
{
g.drawString("This is frame",100,100);
}
}
class winadapt extends WindowAdapter
{
fra f1;
public winadapt(fra f2)
{
f1 = f2;
}
public void windowClosing(WindowEvent e)
{
f1.setVisible(false);
}
}
public class frame3 extends Applet
{
Frame f;
public void init()
{
f = new fra();
f.setSize(100,100);
f.setVisible(true);
}
public void paint(Graphics g)
{
g.drawString("this is applet",10,10);
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
class fram extends Frame
{
String msg=" ";
fram()
{
super("Menu Frame");
MenuBar mb = new MenuBar();
Menu m1 = new Menu("File");
Menu m2 = new Menu("Edit");
MenuItem mi1 = new MenuItem("Open");
MenuItem mi2 = new MenuItem("Save");
MenuItem mi3 = new MenuItem("Copy");
MenuItem mi4 = new MenuItem("Paste");
m1.add(mi1);
m1.add(mi2);
m2.add(mi3);
m2.add(mi4);
mb.add(m1);
mb.add(m2);
setMenuBar(mb);
winadapt w = new winadapt(this);
addWindowListener(w);
mi1.addActionListener(new mnuhandler(this));
mi2.addActionListener(new mnuhandler(this));
mi3.addActionListener(new mnuhandler(this));
}
public void paint(Graphics g)
{
g.drawString(msg,100,100);
}
}
class mnuhandler implements ActionListener
{
fram f1;
public mnuhandler(fram f2)
{
f1 = f2;
}
public void actionPerformed(ActionEvent ae)
{
String msg;
String s = (String) ae.getActionCommand();
if(s.equals("Open"))
msg = "Open";
else if(s.equals("Save"))
msg ="Save";
else if(s.equals("Copy"))
msg = "Copy";
else
msg = "Paste";
msg = msg +" selected";
f1.msg=msg;
f1.repaint();
}
}
class winadapt extends WindowAdapter
{
fram f1;
public winadapt(fram f2)
{
f1 = f2;
}
public void windowClosing(WindowEvent e)
{
f1.dispose();
}
}
public class frammenu extends Applet
{
Frame f;
public void init()
{
f = new fram();
f.setSize(300,300);
f.setVisible(true);
}
}
import java.awt.*;
import java.applet.*;
public class mnu extends Applet
{
Frame f;
MenuBar mb;
Menu m1,m2;
MenuItem mi1,mi2,mi3,mi4;
public void init()
{
f = new Frame();
f.setSize(400,400);
f.setVisible(true);
mb = new MenuBar();
m1 = new Menu("files");
m2 = new Menu("edit");
mi1 = new MenuItem("new");
mi2 = new MenuItem("open");
mi3 = new MenuItem("cut");
mi4 = new MenuItem("paste");
m1.add(mi1);
m1.add(mi2);
m2.add(mi3);
m2.add(mi4);
mb.add(m1);
mb.add(m2);
f.setMenuBar(mb);
}
}
>>>Next>>>
Java Example Event Programming
import java.awt.*;
import java.applet.*;
public class bounds extends Applet
{
Button b1, b2,b3,b4;
public void init()
{
// setLayout(null);
b1 = new Button("First button");
b2 = new Button("test");
b3 = new Button("First button");
b4 = new Button("test");
Label l = new Label("same Label");
l.setBounds(10,10,40,40);
b1.setBounds(50,50,110,110);
b2.setBounds(200,200,50,20);
add(l);
add(b1);
add(b2);
/* setLayout(new FlowLayout());*/
add(l);
add(b3);
add(b4);
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class butt extends Applet implements ActionListener
{
TextField tx,tx1,tx2;
Button b1,b2;
public void init()
{
tx = new TextField(20);
tx1 = new TextField(20);
tx2 = new TextField(20);
b1 = new Button(" + ");
b2 = new Button(" - ");
b1.addActionListener(this);
b2.addActionListener(this);
add(tx);
add(tx1);
add(tx2);
add(b1);
add(b2);
}
public void actionPerformed(ActionEvent ae)
{
int a,b,c;
a = Integer.parseInt(tx1.getText());
b = Integer.parseInt(tx2.getText());
if(ae.getSource()==b1)
{
c = a + b;
tx.setText(String.valueOf(c));
}
else
{
c = a - b;
tx.setText(String.valueOf(c));
}
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class check extends Applet implements ItemListener
{
Checkbox ch,ch1,ch2,ch3;
CheckboxGroup chg;
TextField tx,tx1;
public void init()
{
ch = new Checkbox("Required");
add(ch);
ch.addItemListener(this);
chg = new CheckboxGroup();
ch1 = new Checkbox("Small",false,chg);
ch2 = new Checkbox("Medium",false,chg);
ch3 = new Checkbox("Large",true,chg);
add(ch1);
add(ch2);
add(ch3);
ch1.addItemListener(this);
ch2.addItemListener(this);
ch3.addItemListener(this);
tx = new TextField(15);
add(tx);
tx1 = new TextField(15);
add(tx1);
}
public void itemStateChanged(ItemEvent e)
{
if(e.getItemSelectable()==ch1)
tx.setText("Small selected");
if(e.getItemSelectable()==ch2)
tx.setText("Medium selected");
if(e.getItemSelectable()==ch3)
tx.setText("Large selected");
if(e.getItemSelectable()==ch)
if(ch.getState()==true)
tx1.setText("Required selected");
else
tx1.setText("Required not selected");
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class choice extends Applet implements ItemListener
{
Choice ch;
TextField tx;
public void init()
{
tx = new TextField(14);
add(tx);
ch = new Choice();
ch.add("Videocon");
ch.add("BPL");
ch.add("Onida");
ch.add("Sony");
add(ch);
ch.addItemListener(this);
}
public void itemStateChanged(ItemEvent e)
{
if(e.getItemSelectable() == ch)
tx.setText(ch.getSelectedItem());
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class drag extends Applet implements MouseMotionListener
{
int x,y;
public void init()
{
addMouseMotionListener(this);
}
public void update(Graphics g)
{
paint(g);
}
public void paint(Graphics g)
{
g.setColor(Color.red);
g.drawOval(x,y,4,4);
}
public void mouseDragged(MouseEvent e)
{
x = e.getX();
y = e.getY();
repaint();
showStatus(x +"," + y);
}
public void mouseMoved(MouseEvent e) { }
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class mseadapt extends Applet
{
public void init()
{
Button b;
b = new Button("click me");
b.addMouseListener(new a());
add(b);
}
class a extends MouseAdapter
{
public void mouseClicked(MouseEvent e)
{
showStatus("clicked");
}
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class mseevents extends Applet implements MouseListener
{
public void init( )
{
addMouseListener(this);
}
public void mouseClicked(MouseEvent e)
{
showStatus("Mouse clicked at " + e.getX( ) +" , " + e.getY( ));
}
// Write above code for other mouse events
public void mouseEntered(MouseEvent e)
{
showStatus("Mouse entered at " + e.getX( ) +" , " + e.getY( ));
}
public void mousePressed(MouseEvent e)
{
showStatus("Mouse pressed at " + e.getX( ) +" , " + e.getY( ));
}
public void mouseExited(MouseEvent e)
{
showStatus("Mouse exited at " + e.getX( ) +" , " + e.getY( ));
}
public void mouseReleased(MouseEvent e)
{
showStatus("Mouse released at " + e.getX( ) +" , " + e.getY( ));
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class drag extends Applet implements MouseMotionListener
{
int x,y,c=0;
public void init()
{
addMouseMotionListener(this);
}
public void update(Graphics g)
{
paint(g);
}
public void paint(Graphics g)
{
if(c==0)
{ g.setColor(Color.blue);
g.drawLine(x,y,x+1,y+1);
}
else
{ g.setColor(Color.red);
g.drawOval(x,y,10,10);
}
}
public void mouseDragged(MouseEvent e)
{
c=1;
x = e.getX(); y = e.getY();
repaint();
}
public void mouseMoved(MouseEvent e)
{
c=0;
x=e.getX(); y=e.getY();
repaint();
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class txt extends Applet implements ActionListener
{
TextField tx;
Button b1,b2;
public void init()
{
tx = new TextField(20);
b1 = new Button("Display");
b2 = new Button("Clear");
b1.addActionListener(this);
b2.addActionListener(this);
add(tx);
add(b1);
add(b2);
}
public void actionPerformed(ActionEvent a)
{
if(a.getSource()==b1)
tx.setText("Welcome to Applet");
else
tx.setText("");
}
}
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