How to compile and run Java Programs

The Java compiler requires that a source file use the .java extension.

Compiling the Program
To compile the program, say Example.java, specify the name of the source file on the command line, as shown here:

$ javac Example.java

Running The Program
In Java, all code must reside within a class (say class name is Example). To run the program, you must use the Java Interpreter, called java and specify the name of the class, as shown here:

$ java Example