Learn how to play with Environment in Java programming. Here are most commonly used examples:
How to compile a java file?
How to run a class file?
How to debug a java file?
How to set classpath?
How to view current classpath?
How to set destination of the class file?
How to run a compiled class file?
How to check version of java running on your system?
How to set classpath when class files are in .jar file?