How to run java program from command prompt?

Follow below step by step process:-
1. Create a folder C:\java program.
2. Using Notepad or notepad+ text editor, create a small Java file HelloWorld.java

public class HelloWorld
{
  public static void main(String[] args)
  {
    System.out.println("Hello, World!");
  }
}

Save your file as HelloWorld.java in java program folder.

3. Click on start and type command prompt in search and press enter. Command Prompt will open

4. Run Command Prompt 

- Type C:\> cd \java program

This makes C:\java program the current directory.

- Type C:\> \java program\dir

This directory show HelloWorld.java among the files.

- Type C:\> \java program\set path=%path%;C:\Program Files\Java\jdk1.8.0_144\bin

This tells the system where to find JDK programs. Setting path be carefull otherwise system got crash

- C:\java program> javac HelloWorld.java

This runs javac.exe, the compiler. If any error please check text file and set path

-Type C:\> \java program\dir

javac has created the HelloWorld.class file.  You should see HelloWorld.java and HelloWorld.class among the files in same location.

-Type C:\java program> java HelloWorld

This runs the Java interpreter.  You should see the program output:

Hello, World!