The installer is relatively straightforward to use. Downloading the Java SE version of the JDK. The JDK has many flavors, including a micro edition and an enterprise development edition, but for learning Java, the right one to download and install is the standard edition: Java SE (Figure 1).įigure 1.

To acquire the tools that allow you to compile source code, package Java applications in Java archives (JAR files) and acquire a JVM on which your Java programs can run, you need to download and install the Java development toolkit from Oracle. 'Write once, run anywhere,' or WORA, as it is often abbreviated, is one of the key reasons Java has become such a popular programming language. Any JVM is capable of running bytecode, so any computer that has a JVM installed is capable of running Java programs. In order for Java programs to run, source code needs to be compiled into Java bytecode, which contains the low-level instructions understood by the Java virtual machine. Writing Java-based applications requires a bit of up-front installation and configuration.

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