Separate the JDK, JVM, and library - Java | Zoonk

Separate the JDK, JVM, and library - Java | Zoonk

Separate the JDK, JVM, and library

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A simple diagram showing one `Hello.java` file in the center with three separate helpers around it: a wrench labeled `Build tool`, a small engine labeled `Run engine`, and a box of code blocks labeled `Ready-made classes`.

Three jobs, not one thing

A Java program usually starts as a .java file. To become a running app, it needs three different kinds of help: a tool to build it, an engine to run it, and ready-made code to call.