Import Javax.swing.*; Import Java.awt.*;

question 20

Essay

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JMouseActionFrame extends JFrame implements MouseListener
{
   private int x, y;
   private JLabel label = new JLabel("Do something with the mouse");
   String msg = "";
   public JMouseActionFrame()
   {
      setTitle("Mouse Actions"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setLayout(new FlowLayout()); addMouseListener(this);
      add(label);
   }
   public void mouseClicked(MouseEvent e)
   {
      int whichButton = e.getButton(); msg = "You pressed mouse ";
      if(whichButton == MouseEvent.BUTTON1)
         msg += "button 1.";
      else
         if(whichButton == MouseEvent.BUTTON2)
            msg += "button 2.";
         else
            msg += "button 3.";
      msg += " You are at position " +
         e.getX() + ", " + e.getY() + ".";
      if(e.getClickCount() == 2)
         msg += " You double-clicked.";
      else
         msg += " You single-clicked.";
      label.setText(msg);
}
@Override
public void mouseEntered(MouseEvent e)
{
   msg = "You entered the frame.";
   label.setText(msg);
}
@Override
public void mouseExited(MouseEvent e)
{
   msg = "You exited the frame.";
   label.setText(msg);
}
@Override
public void mousePressed(MouseEvent e)
{
}
@Override
public void mouseReleased(MouseEvent e)
{
}
@Override
public static void main(String[] args)
{
   JMouseActionFrame mFrame = new JMouseActionFrame();
   final int WIDTH =  750; final int HEIGHT  =  300; mFrame.setSize(WIDTH, HEIGHT);                mFrame.setVisible(true);
}
}
The above code shows a JMouseActionFrame application that demonstrates several of the mouse listener and event methods. The constructor sets a frame title by passing it to the parent of JMouseActionFrame , sets a close operation, sets the layout manager, enables the frame to listen for mouse events, and adds the JLabel to the JFrame . However, most of the action occurs in the mouseClicked() method. Describe what actions occur in this method.

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