Java call to find runnig programs

For information on different completion modes, refer to Code completion. Valid Java classes can be compiled into bytecode. You can compile and run classes with the main method right from the editor using the green arrow icon in the gutter. Click in the gutter and select Run 'HelloWorld. The IDE starts compiling your code.

When the compilation is complete, the Run tool window opens at the bottom of the screen. The second line shows the program output: Hello, World! And the last line shows the exit code 0 , which indicates that it exited successfully. First, it builds your application. On this stage, javac compiles your source code into JVM bytecode. Once javac finishes compilation, it places the compiled bytecode to the out directory, which is highlighted with yellow in the Project tool window. After that, the JVM runs the bytecode. When the code is ready, you can package your application in a Java archive JAR so that you can share it with other developers.

A built Java archive is called an artifact. Click , point to JAR and select From modules with dependencies.

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To the right of the Main Class field, click and select HelloWorld com. Point to HelloWorld:jar and select Build. Name the new configuration: HelloWorldJar. Doing this means that the HelloWorld. Run configurations allow you to define how you want to run your application, with which arguments and options. You can have multiple run configurations for the same application, each with its own settings. On the toolbar, select the HelloWorldJar configuration and click to the right of the run configuration selector.

As before, the Run tool window opens and shows you the application output. The process has exited successfully, which means that the application is packaged correctly.

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Create your first Java application In this tutorial, you will learn how to create, run, and package a simple Java application that prints Hello, World! Select and download the necessary JDK version. If you're not sure which version you need, select the latest stable version. Create a new Java project In IntelliJ IDEA, a project helps you organize your source code, tests, libraries that you use, build instructions, and your personal settings in a single unit. Name the project, for example: HelloWorld.

What Is a Java Thread?

Create a package and a class Packages are used for grouping together classes that belong to the same category or provide similar functionality, for structuring and organizing large applications with hundreds of classes. Call the println method using code completion After the main method declaration, IntelliJ IDEA automatically places the caret at the next line. Build and run the application Valid Java classes can be compiled into bytecode.

Package the application in a JAR When the code is ready, you can package your application in a Java archive JAR so that you can share it with other developers. Apply the changes and close the dialog.

How to get a list of current open windows/process with Java? - Stack Overflow

Run the packaged application To make sure that the JAR artifact is created correctly, you can run it. But, there are likely to be situations where this is not desired. Once the commands are all added to the command list, they are passed to the ProcessBuilder. The ProcessBuilder takes this list and uses each value contained in it to generate the command.

Each value inside the command list is separated with spaces by the ProcessBuilder. There are other overloads of its constructor, one of which takes in a single string where you can manually define the whole command yourself. This removes the need for you to manually manage the addition of arguments to the command string.

The subprocess is started with its IO passing up to the process that executed it. This is required to see both any stdout s and stderr s it produces.

Running a Java Class as a Subprocess

Finally waitFor tells the executing thread to wait for the spawned subprocess to finish. It does not matter if the process ends successfully or errors — as long as the subprocess finishes somehow. The main execution can carry on going.

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  • How the process finished is detailed by its exitValue. For example, 0 normally denotes a successful execution and 1 details an invalid syntax error. There are many other exit codes and they can all vary between applications. I have cut out a lot of the paths included classpath to keep it a bit tidier.

    Yours will probably look much longer than this. It really depends on your application. The path in the command above is the bare minimum needed to get it to run obviously customized for my machine. The exec method is reasonably flexible and helpful in describing what is going on.

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    Although, if you wish to make it more malleable and applicable in a wider range of situations, I recommend returning the ProcessBuilder itself from the method. Allowing you to reuse this piece of code in several places while providing the flexibility to configure the IO redirects as well as the power to decide whether to run the subprocess in the background or block and wait for it to finish.

    This would look something like:. In my situation, this was very helpful in spawning subprocesses inside of an integration test without needing to pre-build any jars. This allowed control over JVM arguments, such as the memory of the subprocesses, which would not be configurable if run directly inside the existing process. If you enjoyed this post or found it helpful or both , then please feel free to follow me on Twitter at LankyDanDev , and remember to share with anyone else who might find this useful!