Space Invaders 102 is a Java2D tutorial game, written and placed in the public domain by Kevin Glass. It is a successor to the Space Invaders 101 tutorial that aims to cover issues in high-resolution timing in Java games, as well as some basic sprite animation.

See the tutorial for a nuts-and-bolts explanation of how the game was designed and implemented.

Unfortunately, the original version depends upon a now-unavailable timing library (the "GAGE Timer") under Windows. I've updated the code to use System.nanoTime() instead, as that's now widely available. I've lightly edited the tutorial to reflect this change.

As mentioned in the original tutorial, the various timers have different properties across different host platforms of the JVM. Later tutorials in this series use LWJGL, which includes a pair of calls, Sys.getTime() and Sys.getTimerResolution() to provide better, more consistent cross-platform timer behavior.

You'll need Apache Maven 3.0+ and a recent JDK. Clone the repository, and use:

cd spaceinvaders-102-java
mvn package

to create an executable jar in target.

You can execute the jar by double-clicking it in your GUI, or using

java -jar spaceinvaders-java-102-1.0.0-SNAPSHOT.jar

after navigating to the target directory.

All Java code placed in the public domain by Kevin Glass.

Sprites taken from SpriteLib, licensed under the Common Public License 1.0.