You can use it as your text editor in this example, but it is certainly not necessary.Compiling and Running a Java Program Using the Command Line Compiling and Running a Java Program Using the Command Line That's all there is to it.Īs a side note, TextWrangler is just a text editor for OSX and has no bearing on this situation. You should see 'Hello World!' printed in the terminal window. Once it loads that class, it will execute the main method I mentioned earlier. This command will start a Java Virtual Machine and attempt to load the class called HelloWorld. To run the program, type the following command in the terminal. This file contains Java byte codes, which are the instructions that the Java Virtual Machine understands. The process of compiling will produce a single file, called 'HelloWorld.class'. You just compiled your first Java application, albeit a simple one, on OSX. Type the following commands into the terminal: Run the Terminal app, which is located in 'Applications/Utilities/Terminal.app'. Now that you have written a simple Java program, you need to compile it. The () method will print a line of text to the screen, 'Hello World!' in this example. Think of it as a starting point for your program.
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. This simple program declares a single class called HelloWorld, with a single method called main. 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.įor example, if your username is David, save it as '/Users/David/HelloWorld.java'.
The first step is writing a simple Java program. 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.
#COMPILING JAVA IN CMD HOW TO#
This likely breaks when you upgrade your JDK installation but you have access to all the command line tools now.įollow comments above about how to compile the file ('javac MyFile.java' then 'java MyFile') Ħ,165 28 28 gold badges 66 66 silver badges 94 94 bronze badges 5 AnswersĬompiling and running a Java application on Mac OSX, or any major operating system, is very easy.
#COMPILING JAVA IN CMD WINDOWS#
Within this folder are symbolic links to a handful of java executables but 'javac' is NOT one of them so when trying to run 'javac' from Windows command line it throws an error.
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