Java Programming Applet

What is Java Applet?:

Applets are simple applications that are accessed on internet server.
Applet program can be displayed in browser or appletviewer.

How to create a java applet program?

  We need to import Abstract Window Toolkit(AWT) classes. AWT supports window based graphical interface.
  Once imported AWT classes, need to extend Applet class and subclass must be public which will be accessed by code.
  paint() method must be overridden by the applet program, this paint method will be called that the applet must redisplay its output.
// java applet program example:
import java.awt.*;                                                              
import java.applet.*;                                                           
/*                                                                              
<applet code="JavaAppletTest" width=500 height=200>                           
</applet>                                                                  
*/                                                                              
                                                                                
public class JavaAppletTest extends Applet {                                    
 public void paint(Graphics gr) {                                               
  //Writes text in the applet window.
  gr.drawString("Java Applet Test", 20, 30);                                    
 }                                                                              
}      

How to run java applet program in appletviewer?

1) Compile the applet program: javac JavaAppletTest.java
2) Create the html file 'RunJavaAppletTest.html'
   <applet code="JavaAppletTest" width=500 height=200>                           
   </applet> 
3) Run th appletviewer command to see the output in appletviewer.
   $ appletviewer RunJavaAppletTest.html

Appletviewer Output:

Java applet program output

How to run applet on browser?

Create a html file should be like this.
<html>                                                                        
<body>                                                                        
<applet code="JavaAppletTest.class" width=500 height=200>                       
</applet>                                                                     
</body>                                                                        
</html> 

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