You’ll probably be familiar with some of them, for example: What else is in the JRE? #Īlso in the JRE are many libraries that Java applications may rely on at runtime. So you can think of JRE as containing the JVM, but more accurately the JRE has the libraries to start the JVM. When you do this, a JVM starts up to execute statements contained within. Use the java command to execute Java application. The most important is java.exe inside the bin directory. This is the minimum set of files needed to run any Java application. What sort of library? Here’s what we see if we list of the contents of the JRE. It’s a library which you install on any machine you need to run Java programs. While the focus of the JDK is on developing Java applications, the JRE (Java Runtime Environment) is all about running them. Install and use it on your development machineĪlso use on Continuous Integration (CI) servers to build Java applications Has many other tools within bin directory ( jar, javadoc etc.) Includes the javac compiler command to generate Java bytecode from source code It’s a set of tools for developing Java applications We’ll learn more about the JVM later when we use it to run our HelloWorld application. Bytecode has been optimised and compressed specifically for the JVM to run as fast as possible. Well, it’s important to know that the JVM (Java Virtual Machine) receives instructions through bytecode (. If you don’t want to specify the full path to your JDK, then setup your PATH environment variable as described in this tutorial. Let’s try compiling this simple HelloWorld.java class using javac. Without it you wouldn’t be able to compile your source code to later run using the JRE (more on that later). One of the most important tools in the JDK is javac. Have a look yourself and try running them! Let’s compile something using the JDK # There are in total 35 tools in the JDK bin directory, including JConsole, used to monitor Java applications. Javadoc: generates HTML documentation from your Java source files The JDK bin directory #įor example, in the bin directory are these programs: What the heck is all this stuff? It’s a suite of juicy tools to help you do an awesome job as a Java developer.
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