Java Program: J2SE Event Model in Java

J2SE Event Model:

An event is issued, when the user performs and action at the user interface level like: clicks a mouse or presses a key.

J2SE Event Model Program:

 import java.awt.*;
 import java.awt.event.*;

 public class EventHandle implements WindowListener, ActionListener{
   private Frame f;
   private Button b1, b2, b3;
   private TextField tf;

   public EventHandle(){
     f = new Frame(”Button Handling”);
     b1 = new Button(”YES”);
     b1.setActionCommand(”yes button”);
     b2 = new Button(”NO”);
     b2.setActionCommand (”no button”);
     b3 = new Button (”Clear”);
     b3.setActionCommand (”clear button”);
     tf = new TextField(30);
   }

   public void launchFrame(){
     b1.addActionListener(this);
     b1.setForeground(Color.white);
     b1.setBackground(Color.blue);

     b2.addActionListener(this);
     b2.setForeground(Color.red);
     b2.setBackground(Color.green);

     b3.addActionListener(this);
     b3.setForeground(Color.blue);
     b3.setBackground(Color.yellow);

     tf.setForeground(Color.blue);
     tf.setBackground(Color.white);

     f.setLayout(new FlowLayout());
     f.add(b1);
     f.add(b2);
     f.add(b3);
     f.add(tf);
     f.addWindowListener(this);
     f.setSize(250, 150);
     f.setBackground(Color.red);
     f.setVisible(true);
   }

   public void actionPer formed(ActionEvent e){
     String str;
     if(e.getActionCommand()==” yes button”){
       str = ”You press YES button ”;
       tf.setText(str);
     }
     if(e.getActionCommand()==”no button”){
       str = ”You press NO button”;
       tf.setText(str);
     }
     if(e.getActionCommand()==” clear button”){
       str = ” ”;
       tf.setText(str);
     }
   }

   public void windowClosing(WindowEvent e){
    System.exit(0);
   }

   public void windowOpened(WindowEvent e){}
   public void windowIconified(WindowEvent e){}
   public void windowDeiconified(WindowEvent e){}
   public void windowClosed(WindowEvent e){}
   public void windowActivated(WindowEvent e){}
   public void windowDeactivated(WindowEvent e){}

   public static void main(String[]args){
     EventHandle eh = new EventHandle();
     eh.launchFrame();
   }
 }