Execute java with cmd

How to Compile & Run Java Program Using Command Prompt

This article was co-authored by Yaffet Meshesha. Yaffet Meshesha is a Computer Specialist and the Founder of Techy, a full-service computer pickup, repair, and delivery service. With over eight years of experience, Yaffet specializes in computer repairs and technical support. Techy has been featured on TechCrunch and Time.

This article has been viewed 952,736 times.

While many programming environments will allow you to compile and run a program within the environment, you can also compile and run using Command Prompt. Both Windows and Mac have their own versions of Command Prompt, although it is technically called Terminal on the Mac OS. The process is essentially identical for Windows and Mac.

Compiling and Running

• To ensure that your file is saved as a .java file, be sure to write .java after the file name, and select All Files from the dropdown extension menu.
• Make note of where you saved the file on your system.
• If you are unsure of how to write a program in Java, check out our tutorial on how to program in Java. For the purposes of learning how to compile and run a program, though, you can use any sort of Java program.

• Windows: Press ⇱ Home , then type cmd. Press ↵ Enter to open the Command Prompt.
• Mac: In Finder, press the Go tab, select Applications, select Utilities, then select Terminal.

• If not, you may need to install the Java Development Kit from their website. It is free and can be found at this link: http://www.oracle.com/technetwork/java/javase/downloads/index.html.

• For example, if you were operating in C:\Users\Bob\Project and wanted to get to C:\Users\Bob\Project\TitanProject , enter in cd TitanProject and press ↵ Enter .
• You can see a list of what is in your current directory by typing dir and pressing ↵ Enter .

• If you have any errors in your program, or if there is difficultly compiling, the command prompt will notify you.
• Check out our article about how to fix compiler errors in Java for more help.

• After pressing ↵ Enter , your program should run. If you receive an error, or if your program fails to run in any way, refer to the troubleshooting method.

Troubleshooting

• Windows: Type java -version into the command prompt and press ↵ Enter . Based off the version of Java displayed on the first line, type in set path=%path%;C:\Program Files\Java\jdk1.5.0_09\bin to the command prompt and press ↵ Enter . Substitute jdk1.5.0_09 with whatever version of Java you have installed.
  • Be sure you are entering in this command while in the directory containing your Java project.

  Community Q&A

  What would I do if I type in the Java filename.java and it is not running? The code written in Notepad is correct.

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  Once you are in the correct directory, you can compile the program by typing «javac filename.java» into the command line and pressing enter.

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  Thanks! We’re glad this was helpful.
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  Again, it is important that you have the Java JDK downloaded and installed on your computer. The link is here: http://www.oracle.com/technetwork/java/javase/downloads/index.html.

  

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  About This Article

  This article was co-authored by Yaffet Meshesha. Yaffet Meshesha is a Computer Specialist and the Founder of Techy, a full-service computer pickup, repair, and delivery service. With over eight years of experience, Yaffet specializes in computer repairs and technical support. Techy has been featured on TechCrunch and Time. This article has been viewed 952,736 times.

  1. Type ″cmd″ into Windows search.
  2. Right-click Command prompt.
  3. Click Run as administrator.
  4. Type ″cd \path\to\java\program″.
  5. Press Enter.
  6. Type ″javac -filename.java″.
  7. Press Enter.
  8. Type ″java filename.java″.
  9. Press Enter.

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  How to Run Java Program?

  

  At first, check that Java is installed in your system and the path is properly set then we will see how to run the java program. If Java is not installed on the system or path is not defined properly, then we can’t run any Java programs on our system. After the JDK installation, compiling and running the java program is very easy.

  A java file is compiled using the javac command which generates a platform-independent bytecode that can be executed in any machine by a Java Virtual Machine (JVM). The bytecode is executed using the java command which executes the bytecode and produces the result.

  How to Run a Java Program Using Command Prompt and Notepad?

  Here we will be using Notepad and Command Prompt to run the Java programs. Let’s see the process step-by-step:

  • Create a new folder.
  • Go to the folder, and make the new Java file in that folder.
    • Press Alt+D, and just type Notepad there.
    • Notepad will open, now paste the java code given below in the Notepad and save it with extension java.

    Let’s see the above steps with images:

    Step 1: I have used the code given below for performing all the below operations. Open the Notepad and copy this code in the notepad and save that file with the extension .java.

    You can see in the below images that, I have written the java code and saved it as test.java. Now the new file will be created with the name test.java.

    

    

    

    Step 2: You can see that inside the Art folder, there is a java file with the name test.java.

    

    Step 3: Now press Alt+D , and you will get into the above search bar.

    

    Step 4: Type CMD and press enter key.

    

    Step 5: You can see that the CMD is open. Now type javac test.java , as you can see in the below image.

    

    Step 6: You can see that a new file has been created with the .class extension . The name of the file would be the name of the class you have used inside your program. In my case, I have used the Scaler as a class name.

    

    Step 7: Now again, open the cmd and type the command java Scaler as you can see in the below image.

    

    Step 8: At last, you will see that the content of the file has been displayed .

    

    The javac Command

    Java programs are compiled using the javac command. It takes .java files as input and generates bytecode.

    The java Command

    The java command is used to execute Java bytecodes. It takes bytecode as input, executes it, and outputs the result.

    Conclusion

    • We have seen how to run a Java program using notepad .
    • Create the Java file using Notepad and run it using java and javac commands.
    • Java programs are compiled using the javac command.
    • The java command is used to execute the Java bytecode generated as a result of compilation.

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