How to Run Java Program in CMD Prompt
Running a Java program in the Command Prompt (CMD) is a fundamental skill for any Java developer. Whether you are new to Java or have been coding for years, understanding how to execute Java programs from the command line is essential. This article will guide you through the process of running a Java program in CMD, step by step.
1. Set Up Java Development Kit (JDK)
Before you can run a Java program in CMD, you need to have the Java Development Kit (JDK) installed on your computer. The JDK includes the Java Runtime Environment (JRE) and the Java compiler, which are necessary for compiling and running Java programs.
To install the JDK, visit the official Oracle website or download it from a trusted source. Follow the installation instructions provided by the JDK installer, making sure to add the JDK’s bin directory to your system’s PATH environment variable.
2. Create a Java Program
Once you have the JDK installed, you can start creating your Java program. Open a text editor, such as Notepad, and write a simple Java program. Save the file with a .java extension, for example, HelloWorld.java.
Here’s a basic example of a Java program:
“`java
public class HelloWorld {
public static void main(String[] args) {
System.out.println(“Hello, World!”);
}
}
“`
3. Compile the Java Program
To compile your Java program, open the Command Prompt and navigate to the directory where you saved your Java file. You can use the `cd` command to change directories. For example:
“`
cd C:\path\to\your\java\program
“`
Once you are in the correct directory, compile your Java program using the `javac` command followed by the name of your Java file:
“`
javac HelloWorld.java
“`
If the compilation is successful, you will see a message indicating that the class was compiled without errors. If there are any errors, the compiler will output a list of error messages that you need to fix.
4. Run the Java Program
After compiling your Java program, you can run it using the `java` command followed by the name of the class that contains the `main` method. In our example, the class name is `HelloWorld`. Here’s how to run the program:
“`
java HelloWorld
“`
If everything is set up correctly, you should see the output “Hello, World!” displayed in the Command Prompt.
5. Troubleshooting Common Issues
If you encounter any issues while running your Java program in CMD, here are some common troubleshooting steps:
– Ensure that the JDK is installed correctly and that the bin directory is added to the PATH environment variable.
– Verify that you are using the correct class name when running the program.
– Check for any syntax errors in your Java code.
– Make sure that you have the necessary permissions to execute the program.
By following these steps, you should be able to run your Java program in the Command Prompt without any issues. Happy coding!
