Event Handing-list

 program to show message on applet status according to selected option of list

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class pst10 extends Applet implements ItemListener

{

       List l;

       String msg;

       public void init()

       {

              l=new List();

              l.add("apple");

              l.add("mango");

              l.add("banana");

              add(l);

              l.addItemListener(this);

             

       }

       public void itemStateChanged(ItemEvent ie)

       {

              repaint();

       }

       public void paint(Graphics g)

       {

              msg="your selection string";     

       msg+=l.getSelectedItem();//this method is use to specify which item is currentely selected

              g.drawString(msg,20,200);

       }

}

/*

<applet code="pst10.java" width=100 height=200>

</applet>

*/
output:

 

Event handling -Radio button

Program to change background color of frame  according to radio button.

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

/*

<applet code="pst19.java" width=100 height=200>

</applet>

*/

public class pst19 extends JApplet implements ActionListener

{

       Container contentPane=getContentPane();

      

       public void init()

       {

             

              contentPane.setLayout(new FlowLayout());

      

              JTextField jtf=new JTextField(17);

              contentPane.add(jtf);

             

              JRadioButton rb=new JRadioButton("Red");

              rb.addActionListener(this);

              contentPane.add(rb);

              JRadioButton rb1=new JRadioButton("Yellow");

              rb1.addActionListener(this);

              contentPane.add(rb1);

              JRadioButton rb2=new JRadioButton("Blue");

              rb2.addActionListener(this);

              contentPane.add(rb2);

      

              ButtonGroup bg=new ButtonGroup();

              bg.add(rb);

              bg.add(rb1);

              bg.add(rb2);

       }

       public void actionPerformed(ActionEvent ae)

       {

              String str;

              str=ae.getActionCommand();

      

              if(str=="Red")

              {

             

              contentPane.setBackground(Color.red);

              showStatus(str);

              }

                    

              else if(str=="Yellow")

              {

             

              contentPane.setBackground(Color.yellow);

              showStatus(str);

              }

             

              else if(str=="Blue")

              contentPane.setBackground(Color.blue);

       showStatus(str);

             

             

       }

}

Java Program(Network)

Java program of URL connection to get Port ,get Content Type, get Last Modified etc.

import java.net.*;

import java.io.*;

import java.util.Date;

class pst15

{

       public static void main(String str[])throws Exception

       {

              URL u=new URL("http://presidentofindia.nic.in/speeches.html");

             

              URLConnection uc=u.openConnection();

              System.out.println("Date:"+ new Date(uc.getDate()));

              System.out.println("port is"+u.getPort());

              System.out.println("type of content:"+ uc.getContentType());

              System.out.println("Expire:"+ uc.getExpiration());

              System.out.println("date of last modified:"+ new Date(uc.getLastModified()));

              int len=uc.getContentLength();

              System.out.println("length"+len);

       }

      

}

/*output:

payal@payal-HP-Notebook:~$ javac pst15.java

payal@payal-HP-Notebook:~$ java pst15

Date:Thu Jan 01 05:30:00 IST 1970

type of content:null

Expire:0

date of last modified:Thu Jan 01 05:30:00 IST 1970

length-1

*/

java program to perform to understand the InetAddress in Advance java

import java.net.InetAddress;

import java.net.UnknownHostException;

public class pst27

{

       public static void main(String arg[])

       {

              try

              {

                     InetAddress local=InetAddress.getLocalHost();

                     String address=local.getHostAddress();

                     String hostName=local.getHostName();

                    

                     System.out.println("local host IP address:"+address);

                     System.out.println("local host name:"+hostName);

              }

              catch(UnknownHostException e)

              {

                     e.printStackTrace();

              }

       }

}

/*

payal@payal-HP-Notebook:~$ javac pst27.java

payal@payal-HP-Notebook:~$ java pst27

local host IP address:127.0.1.1

local host name:payal-HP-Notebook

*/     

 Java Program to perform some of the function of URL class

import java.net.*;

import java.io.*;

public class pst28

{

       public static void main(String obj[])

       {

              try

              {

                     URL u=new URL("http://www.tutorialpoint.com/java8/index.htm");

                     System.out.println("URL is"+u.toString());

                     System.out.println("protocol is"+u.getProtocol());

                     System.out.println("authority is"+u.getAuthority());

                     System.out.println("file name is"+u.getFile());

                     System.out.println("host is"+u.getHost());

                     System.out.println("path is"+u.getPath());

                     System.out.println("port is"+u.getPort());

                     System.out.println("default port"+u.getDefaultPort());

                           System.out.println("query is"+u.getQuery());

              System.out.println("ref is"+u.getRef());

System.out.println("External form:"+u.toExternalForm());

              }

              catch(Exception e)

              {

                     e.printStackTrace();

              }

}

/*output

payal@payal-HP-Notebook:~$ javac URLDemo.java

payal@payal-HP-Notebook:~$ java URLDemo

URL ishttp://www.tutorialpoint.com/java8/index.htm

protocol ishttp

authority iswww.tutorialpoint.com

file name is/java8/index.htm

host iswww.tutorialpoint.com

path is/java8/index.htm

port is-1

default port80

query isnull

ref isnull

*/ 

   

}