The example applet from Wikipedia

Applet.java

import java.applet.Applet;
import java.awt.*;
 
// Applet code for the "Hello, world!" example.
// This should be saved in a file named as "HelloWorld.java".
public class HelloWorld extends Applet {
    // This method is mandatory, but can be empty (i.e., have no actual code).
    public void init() {
    }
 
    // This method is mandatory, but can be empty.(i.e., have no actual code).
    public void stop() {
    }
 
    // Print a message on the screen (x=20, y=10).
    public void paint(Graphics g) {
        g.drawString("Hello, world!", 20, 10);
 
        // Draws a circle on the screen (x=40, y=30).
        g.drawArc(40, 30, 20, 20, 0, 360);
    }
}