As soon as you get close to the left or right border, the tank will move in this direction. The laser needs energy to operate. This energy is always regenrating at a slow rate. Your score is displayed below the Weapons energy. The Radar in the center is showing all enemy ships.
Ships draining energy are red.
The remaining energy of the base is in the upper right part of the console. As soon as this energy reaches zero, the game is over. Unzip with a compression utility. In this tutorial Johannes Wallroth gives a series of fairly simple examples in order to enable you to get a grasp of the possibilities and the syntax of the Java language. Take a step by step walk through the process of building a Java applet with programmer Bavo Bruylandt.