Step 2: Compiling the Java Program

Open Command Prompt (CMD) in the Folder

Command Prompt (CMD) is a tool that helps us tell the computer what to do.

Instead of typing cd <path>, you can open CMD directly inside the folder by following these steps:

1. Open your FirstProgram folder.
2. Click on the address bar at the top (where you see the folder’s path).
3. Type cmd and press Enter.
4. A black window (CMD) will open.

Compile the Java Program

Java programs cannot run directly. First, we need to convert the code into a language the computer understands (this process is called compiling).

1. In CMD, type:

javac MyFirstProgram.java

2. Press Enter.

• If there are mistakes in your code, CMD will show errors. You must fix them and compile again.
• If there are no mistakes, CMD will not show anything, and a new file named MyFirstProgram.class will be created in the folder.

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

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