8 Steps to run the Java program using a command prompt.

Step 1: Write a Java code using notepad
For example
  1. class HelloWorld {
  2. public static void main(String args[]) {
  3. System.out.println("Hello Java");
  4. }
  5. }
Step 2: Save it as HelloWorld.java (For example: It is saved in C:\Users\comp\Java Practiced program).
Step 3: Set the environment variable.
Right Click on MyComputer -> Properties -> Advanced System settings -> Inside Advanced tab
Click Environment variables -> Inside System Variables click New -> Give variable name (For example var) -> Give variable value. It is path in your system where java compiler is available (For example variable value :C:\Program Files\Java\jdk1.6.0_23\bin ). Inside bin javac is Java compiler.
Click Ok.
Step 4: Go to the command prompt by using start->Run->cmd OR start-> type cmd in the search program and file.
Press Enter.
Step 5: Use the following command to go to the folder where the previous Java program is stored.
cd C:\Users\comp\Java Practiced program
Press enter
Step 6: Set the path of Compiler. It is a path in your system where java compiler is available
For example, set path=C:\Program Files\Java\jdk1.6.0_23\bin;
Press enter
Step 7: Write the following command for the compilation of the program.
javac HelloWorld.java
Press Enter
Step 8: To run the program using the following command
java HelloWorld
Now output is shown: Hello Java
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