Balloons and Radar with MachineGun

Please note that this applet is written in Java 1.1.4; it may not work on some browsers

Illustration of threads
All of the following are threads in these game:
Machine Gun, Balloon Releaser, Balloons and Bullets
Machine Gun does not fire unless balloons are between the red lines (or triggered by manually from the "Manual Fire" button)

Source code: Animal.java,