How to use MouseListener Interface to handle Mouse Events in Java

(adsbygoogle = window.adsbygoogle || []).push({});

Image may be NSFW.
Clik here to view.

How to use MouseListener Interface to handle Mouse Events in Java

Concept: In this Java program the problem is to handle mouse click using the concept of an Applet and learn how to use MouseListener Interface in Java to handle Mouse Events. Also display the coordinate of the clicked point on the status and display the status of mouse event in a label.

Introduction to Mouse Events on Java Applets

Mouse events notify when the user uses the mouse (or similar input device) to interact with a component. Mouse events occur when the cursor enters or exits a component’s onscreen area and when the user presses or releases one of the mouse buttons.

To track mouse events on screen, a java program implements different interface, such as if an application requires the detection of both mouse events and mouse-motion events, use the MouseInputAdapter class. This class implements the MouseInputListener, a convenient interface that implements the MouseListener and MouseMotionListener interfaces. However, the MouseInputListener interface does not implement the MouseWheelListener interface.

Here to explain simple APIs of MouseListener Interface, an example of a class applet is made with name MouseApplet which is derived from the Applet class and uses the interface MouseListener.

Explanation about MouseListener Interface and MouseListener APIs in Java Applet

Methods for MouseListener Interface

Methods from MouseEvent Class 

Example: Handling Mouse Event in a Java Applet

//program to handle mouse event in an applet

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

public class MouseApplet extends Applet implements MouseListener{

	Label l;
	int x,y;
	public void init(){
		addMouseListener(this);
		l = new Label("Testing mouse click");
		add(l);	
	}
	public void mouseClicked(MouseEvent me){
		x = me.getX();
		y = me.getY();
		showStatus("X:"+x+"Y:"+y);	
	}
	public void mouseReleased(MouseEvent me){
		l.setText("Released");
		setBackground(Color.red);	
	}
	public void mousePressed(MouseEvent me){
		l.setText("Pressed");
		setBackground(Color.green);
	}
	public void mouseEntered(MouseEvent me){
		l.setText("Entered");
		setBackground(Color.yellow);
}
	public void mouseExited(MouseEvent me){
		l.setText("Exited");
		setBackground(Color.blue);	
	}
}
/*<applet code="MouseApplet" width="200" height="200"></applet>*/

 Running Mouse Click Event from Applet Viewer

Image may be NSFW.
Clik here to view.

Running Java Applet – Mouse Event Handler from MouseListener Interface

• First save the java applet as MouseApplet.java
• Compile the java applet using command
  >javac MouseApplet.java
• Run MouseApplet.java as applet using command
  >appletviewer MouseApplet.java

This article is posted under series of Java Programming Tutorials to make understandable knowledge of using MouseListener Interface to hander Mouse events on Java.

The post How to use MouseListener Interface to handle Mouse Events in Java appeared first on The Computer Students.