Coding java in cmd

How to run Java Program in cmd (Command Prompt)

In this article, we will learn how to run the Java Program in cmd / using command prompt.

We are using Java compiler javac for compiling the Java program and Java interpreter java for running the Java program.

Let’s get started :

How to run a Java Program using CMD

We need to follow below mentioned steps in order to run the Java in CMD :

• Create a folder in your machine.
• Create one Java class with some logic.
• Open the command prompt or cmd in your machine.
• Run the Program in CMD.

Create a folder

let’s create a folder named as Sample in your C drive of your machine.

Create a Simple Class

Let’s save this class with name – Test.java in the Sample folder.

Open Command Prompt / CMD

Open command prompt in your machine. You can also open it by typing cmd in run window.

Run the Java Program in CMD

Below are the required steps in cmd :

Now the current directory is Sample.

C:\Sample> set path=%path%;C:\Program Files\Java\jdk1.8.0_101\bin

Replace the above JDK version with your installed java version.

This will Compile the program in cmd.

This is how to run the program in cmd using interpreter.

It will print the following output :

Output:Sample Class to test

Additional Points

You need to ensure that your Windows is able to find the Java compiler and interpreter or not.

Follow below steps :

• Go to Start -> Computer -> System Properties -> Advanced System Settings -> Environment Variables -> System Variables -> PATH

• Click on the “Edit” button.

• Append the semicolon and then jdk path at the end.

• Click on OK button.

Conclusion

We have learnt how to run java program in cmd. It is a very basic question yet very important. To install java in your machine, you can visit url.

You can check your java version with following commands in cmd :

Источник

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 952,416 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.

  Thanks! We’re glad this was helpful.
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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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  Thank you for your feedback.
  As a small thank you, we’d like to offer you a $30 gift card (valid at GoNift.com). Use it to try out great new products and services nationwide without paying full price—wine, food delivery, clothing and more. Enjoy! Claim Your Gift If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow

  Thanks! We’re glad this was helpful.
  Thank you for your feedback.
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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 952,416 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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  Источник

  How to run Java programs using the command prompt ( cmd )

  In this, we will discuss, how to run Java programs using the command prompt ( cmd ) while writing the code in text editors like notepad or sublime and about the errors that we encounter while running it, and how to resolve those.

  1. First, let’s run a simple hello world program using a command prompt or cmd

  You can use any text editor to save the below program, eg. notepad, sublime, etc.

  Now, save this file under the same name as that of class, HelloWorld.java and then run the javac HelloWorld.java command from your command prompt or cmd where you saved the file, this command will create a .class file of your java program in the same folder itself.
  I have placed my file in the demo folder as shown below –

  

  As you can see, before running the javac command, there was only one file, whereas after running the command, a .class file is also generated.
  Then we will just run the java Helloword command from our cmd, and it will print Hello World to the output screen.

  

  2. Now we will look at various issues that we can get while running programs using command prompt (cmd)

  In the above program, we can see that both the filename(HelloWorld.java) and classname(HelloWorld) are the same, but there are cases when both are different. So, let’s change the classname in the Helloword.java file

  Now, let’s run the same command( javac Helloworld.java ) and see what happens. We have got the below error, stating that the Test class should be kept in a Test.java file. So, we have to keep both classname and filename the same.

  HelloWorld.java:1: error: class Test is public, should be declared in a file named Test.java public class Test < ^ 1 error

  What if our program is in some package? what will happen if we run the same commands? Let’s take a sneak peek into this

  In our above programs, our program was not in any package, rather our file was in a default package. Let’s look at the below code where we added a package line

  package demo; public class HelloWorld < public static void main(String[] args) < System.out.println("Hello World"); >>

  Now, again run the same commands,

  

  • javac Helloworld.java
  • java Helloworld

  Now after running the same commands, we got the error saying, Error: Could not find or load main class HelloWorld .
  So, What went wrong here? When we compile a file within some package, then it will be compiled as packageName.className, which means we have to run
  java packageName.className here

  

  Again, we are getting the same error because now we are using demo.HelloWorld. So, we have to move into our parent folder and then run the commands again on cmd as shown below

  

  Hurrrrayyy, it works now. Let us know if you faced any other problems while running java programs in the command prompt or cmd.

  Hope you liked this article. If you have any doubts or concerns, please feel free to write us in comments or mail us at [email protected]

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  Coding java in cmd

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