Java is one of the most commonly used programming languages. It is also an IDE-intensive programming language, with tight integration with Eclipse. If you are just starting out learning Java, here is a basic guide to help you start running the Java application from the command prompt (in Windows).

Compiling and running a Java application on Mac OSX, or any major operating system, is very easy. Apple includes a fully-functional Java runtime and development environment out-of-the-box with OSX, so all you have to do is write a Java program and use the built-in tools to compile and run it. To compile a Java file to runnable.class file you can run. Javac filename.java and run it. Java file It is the most simple use-case and mostly it doesn't work because java classes mostly depends on other java classes placed in libraries. So you would probably like to use some more sophisticated solutions. Online Java Compiler - Online Java Editor - Online Java IDE - Java Coding Online - Online Java Runner - Share Save Java online. Execute Mode, Version, Inputs. Online Java Compiler, Online Java Editor, Online Java IDE, Java Coding Online, Practice Java Online, Execute Java Online, Compile Java Online, Run Java Online, Online Java Interpreter, Compile and Execute Java Online (JDK 1.8.0).

Installing the Java Development Kit (JDK)

Before you can run a Java program on your computer, you’ll need a Java compiler installed. That comes with the Java Development Kit, or JDK. It’s an essential tool for developing in Java on any platform. The JDK is not the same as the Java Runtime Environment, or JRE, which you’ll already have installed if you’ve ever used a Java application on your machine.

1. Download the JDK from Oracle’s website. Make sure not to download the JRE to Server editions.

2. Make sure you grab the Windows version of the development kit.

3. Run the installer normally.

How to compile, package and run a Java program using command-line tools (javac, jar and java) Java Hello World for Beginner with NetBeans IDE; How to create, build and run a Java Hello World program with Eclipse; How to Compile and Run a Java Program with TextPad; How to compile and run a Java program with Sublime Text 3. Have you ever thought if it’s possible to compile and run a java program from another java program? We can use Runtime.exec(String cmd) to issue commands to the underlying operating system. We will use the same approach to compile and run a java program from another java program. Today I’ll explain how to compile and run Java code on Linux environment. Personally, I like Ubuntu, that’s why I’ll show you how to do it there. First of all, you have to be sure that Java is installed on your machine.

Running a Java Program from the Command Prompt

1. Create a simple Java program like the one below using Notepad or another text editor. Make sure to save the file with the extension “.java” rather than “.txt.”

2. Open the Command Prompt from the Start Menu. You can also press Win + R, then type cmd.exe into the Run field.

3. Use the cd command to change your working directory to the directory containing your Java program. Mine is saved in my “Scripts” folder, but you can save your file anywhere you’d like on your system.

4. Locate the path to the version of the Java Development Kit (JDK) on your computer. If you’re running 64-bit Windows, that will typically be in “C:Program FilesJava.”

5. Set the path to the JDK with the “set” command, as seen below:

You may need to change the directory path to reflect the current version of Java. Make sure you’re using the Java Development Kit (JDK) directory and pointing to the “bin” folder. The Java Runtime Environment (JRE) folder also contains a “bin” folder but doesn’t hold the Java compiler. If you get errors around the compilation, make sure you’re using the correct directory path.

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6. Compile the Java program with the javac command, as seen below:

7. You should see absolutely nothing happen. But if you use the dir command, you’ll notice a new file in your directory ending in the “.class” extension. This indicates the program has been compiled.

8. Use the java command to run your program:

Setting Your PATH Permanently

The above command doesn’t set your Java compiler PATH permanently. It sets the environmental variable for that session, but that change will be wiped away when you close the Command Prompt session. Follow the steps below to change your PATH variable for all future sessions.

1. Open Control Panel from the Start Menu and click “System.”

2. Click “Advanced System Settings” in the left menu pane.

3. Click the “Environment Variables…” button at the bottom of the System Properties window.

4. Select the “Path” variable, then click the “Edit” button.

5. Click “New” to add a new directory to your path.

6. Paste the directory path you used above into the text box. Again, make sure you’re using the Java Development Kit (JDK) directory and not the Java Runtime Environment (JRE) directory next to it, then click “OK” to commit to the change.

Conclusion

We ran an extremely simple Java program in our example. But you can initiate Java programs of greater complexity from the Command Prompt. Just use javac to compile a file ending in “.java,” then use the java command to execute the compiled program.

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Active9 months ago

How do I compile and run a program in Java on my mac?

I'm new.

Compile And Run Java

Also I downloaded a program that was suggested to me on here called text wrangler if that has any bearing on the situation.

Peter O.
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DavidDavid
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5 Answers

Compiling and running a Java application on Mac OSX, or any major operating system, is very easy. Apple includes a fully-functional Java runtime and development environment out-of-the-box with OSX, so all you have to do is write a Java program and use the built-in tools to compile and run it.

Writing Your First Program

The first step is writing a simple Java program. Open up a text editor (the built-in TextEdit app works fine), type in the following code, and save the file as 'HelloWorld.java' in your home directory.

For example, if your username is David, save it as '/Users/David/HelloWorld.java'. This simple program declares a single class called HelloWorld, with a single method called main. The main method is special in Java, because it is the method the Java runtime will attempt to call when you tell it to execute your program. Think of it as a starting point for your program. The System.out.println() method will print a line of text to the screen, 'Hello World!' in this example.

Using the Compiler

Now that you have written a simple Java program, you need to compile it. Run the Terminal app, which is located in 'Applications/Utilities/Terminal.app'. Type the following commands into the terminal:

You just compiled your first Java application, albeit a simple one, on OSX. The process of compiling will produce a single file, called 'HelloWorld.class'. This file contains Java byte codes, which are the instructions that the Java Virtual Machine understands.

Running Your Program

To run the program, type the following command in the terminal.

This command will start a Java Virtual Machine and attempt to load the class called HelloWorld. Once it loads that class, it will execute the main method I mentioned earlier. You should see 'Hello World!' printed in the terminal window. That's all there is to it.

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As a side note, TextWrangler is just a text editor for OSX and has no bearing on this situation. You can use it as your text editor in this example, but it is certainly not necessary.

William BrendelWilliam Brendel
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I will give you steps to writing and compiling code.Use this example:

  1. Save the code as Paycheck.java
  2. Go to terminal and type cd Desktop
  3. Type javac Paycheck.java
  4. Type java Paycheck
  5. Enjoy your program!
Kieran
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Rishi ShahRishi Shah

Download and install Eclipse, and you're good to go.
http://www.eclipse.org/downloads/

Apple provides its own version of Java, so make sure it's up-to-date.
http://developer.apple.com/java/download/

Eclipse is an integrated development environment. It has many features, but the ones that are relevant for you at this stage is:

  • The source code editor
    • With syntax highlighting, colors and other visual cues
    • Easy cross-referencing to the documentation to facilitate learning
  • Compiler
    • Run the code with one click
    • Get notified of errors/mistakes as you go

As you gain more experience, you'll start to appreciate the rest of its rich set of features.

polygenelubricantspolygenelubricants
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You need to make sure that a mac compatible version of java exists on your computer. Do java -version from terminal to check that. If not, download the apple jdk from the apple website. (Sun doesn't make one for apple themselves, IIRC.)

From there, follow the same command line instructions from compiling your program that you would use for java on any other platform.

How To Compile And Execute Java Program In Ubuntu

Rob LachlanRob Lachlan
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Other solutions are good enough to answer your query. However, if you are looking for just one command to do that for you -

Create a file name 'run', in directory where your Java files are. And save this in your file -

give this file run permission by running -

Now you can run any of your files by merely running -

ayaio
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DarpanDarpan
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protected by Community♦May 25 '17 at 17:19

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Compiling And Running Java Program In Linux

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