The source code looks like:

import java.applet.*;
import java.awt.Graphics;

public class VariableDemo extends Applet {

	String message;
	String message2 = "The following are examples of using variables.";
	int x = 5;
	int y, z;
	String myNumber;
	boolean really;

		public void init() {
		resize(300, 100);
		message = "Hello there...";
		y = x + x;
		z = x * x;
		myNumber = "13";
		really = true;
		
	}

	public void paint(Graphics g) {
		String answer1 = java.lang.Integer.toString(y);
		String answer2 = java.lang.Integer.toString(z);
		g.drawString(message, 10, 10);
		g.drawString(message2, 10, 35);
		g.drawString("5 + 5 = " + answer1, 10, 60);
		g.drawString("5 * 5 = " + answer2, 10, 85);

	}

}