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Methods for Drawing and Event Handling (The Java™ Tutorials > Deployment > Applets)
Trail: Deployment
Lesson: Applets
Section: Getting Started with Applets
Home Page > Deployment > Applets
Methods for Drawing and Event Handling

Using the Paint Method

To draw the applet's representation within a browser page, you use the paint method.

For example, the Simple applet defines its onscreen appearance by overriding the paint method:

public void paint(Graphics g) {
	//Draw a Rectangle around the applet's display area.
        g.drawRect(0, 0, 
		   getWidth() - 1,
		   getHeight() - 1);

	//Draw the current string inside the rectangle.
        g.drawString(buffer.toString(), 5, 15);
    }

Applets inherit the paint method from the Abstract Window Toolkit (AWT) Container class.

Handling Events

Applets inherit a group of event-handling methods from the Container class.

The Container class defines several methods, such as processKeyEvent and processMouseEvent, for handling particular types of events, and then one catch-all method called processEvent.

To react to an event, an applet must override the appropriate event-specific method. For example, the following program, SimpleClick, implements a MouseListener and overrides the mouseClicked method.

/*
 * Java(TM) SE 6 version.
 */

import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.applet.Applet;
import java.awt.Graphics;

//No need to extend JApplet, since we don't add any components;
//we just paint.
public class SimpleClick extends Applet 
			 implements MouseListener {

    StringBuffer buffer;

    public void init() {
	addMouseListener(this);
	buffer = new StringBuffer();
        addItem("initializing... ");
    }

    public void start() {
        addItem("starting... ");
    }

    public void stop() {
        addItem("stopping... ");
    }

    public void destroy() {
        addItem("preparing for unloading...");
    }

    void addItem(String newWord) {
        System.out.println(newWord);
        buffer.append(newWord);
        repaint();
    }

    public void paint(Graphics g) {
	//Draw a Rectangle around the applet's display area.
        g.drawRect(0, 0, 
		   getWidth() - 1,
		   getHeight() - 1);

	//Draw the current string inside the rectangle.
        g.drawString(buffer.toString(), 5, 15);
    }

    //The following empty methods could be removed
    //by implementing a MouseAdapter (usually done
    //using an inner class).
    public void mouseEntered(MouseEvent event) {
    }
    public void mouseExited(MouseEvent event) {
    }
    public void mousePressed(MouseEvent event) {
    }
    public void mouseReleased(MouseEvent event) {
    }

    public void mouseClicked(MouseEvent event) {
	addItem("click!... ");
    }
}
Below is the resulting applet. When you click within its rectangle, it displays the word "click!...".


Note: If you don't see the applet running above, you need to install Java Plug-in, which happens automatically when you install the Java(TM) SE JRE or JDK. This applet requires JDK 1.4 or later. You can find more information on the Java Plug-in home page.
Previous page: Methods for Milestones
Next page: Methods for Adding UI Components

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java, Tomcat, MySQL, Apache and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


Web Hosting, web hosting, JSP, Servlets, Tomcat, website hosting, web site hosting
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