This is a simple applet program

//importing the packages
import java.applet.*;
import java.awt.*;

//this will include the class file for running in the browser
/*<applet code="FirstApplet.java" width=100 height=100 >< /applet >*/

//main function begins here
public class FirstApplet extends Applet{

public void paint(Graphics g){
//it will prints the string in the applet viewer
g.drawString("Welcome in Java Applet.",40,20);
}
}


Save the above program as FirstApplet.java

compile the program by using javac FirstApplet.java

execute the program by

appletviewer FirstApplet.java or appletviewer FirstApplet.html

the out put of the above program will be