Before you can run Java programs from the command prompt, you’ll need to ensure you have the following:
- Java Development Kit: The Java compiler (javac) and other crucial tools needed for Java development are included with the JDK. The most recent JDK version is available for download from the official Oracle website, or you can pick an open-source substitute like OpenJDK.
- Text Editor: To create and save Java source code, we need a text editor. Most Commonly used text editors are Visual Studio Code, Notepad (which is included with Windows), and any other code editor of your choice.
Setting Up the Environment
We need to set up our environment variables once we have the JDK installed and a text editor available:
- Install JDK: If you haven’t installed JDK, you can just download it from the official site and follow the installation according to the instructions provided along the way.
- Environment Variable: We need to set the environment variable JAVA_HOME to the location of the JDK’s installation directory. Follow the given below steps:
- Select “Properties” by right-clicking on “This PC” (Windows 10).
- On the left, select “Advanced system settings”.
- At the bottom of the Advanced tab, select the “Environment Variables” button.
- Scroll down to the “System Variables” area, find the Path variable, select it, and then click on “Edit.”
- Select “New” and provide the path to your JDK installation directory (e.g., ‘C:\Program Files\Java\jdk1.8.0_291’) in the JAVA_HOME variable’s name. Make sure to modify the path to reflect the version of your JDK.
- Updating the path variable: Inside the “Environment Variables” window, find the Path variable in the “System Variables” section, select it, and click “Edit.”
- Add ‘%JAVA_HOME%\bin’ to the list of paths. It will help in making sure the system can easily find Java executable files.
- Verifying Setup: Search the command prompt run it as an administrator and run the following command:
Writing a Simple Java Program:
It is time to create a basic Java program. Create a new file with the extension “a.java” in your text editor. Name the files a “HelloWorld.java”.
Save the file in the directory of your choice.
Compiling and Running Your Java Program
Follow these steps to compile and run our Java program:
- To compile your Java program, use the javac command.
This command will create a HelloWorld.class file in the same directory if your code is error-free.
- After compiling successfully, use the Java command to run your Java program:
Woohoh! You’ve successfully written, compiled, and run a Java program from the command prompt.
Java developers must have a basic understanding of how to run Java programs in the Command Prompt. You can write, compile, and run Java programs without difficulty in a command-line environment by setting up your environment variables by following all of the steps listed above.
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