Environment in Java programming

Commonly used examples:-

1. How to compile a java file?

2. How to run a class file?

3. How to debug a java file?

4. How to set classpath?

5. How to view current classpath?

6. How to set destination of the class file?

7. How to run a compiled class file?

8. How to check version of java running on your system?

9. How to set classpath when class files are in .jar file?