What is JDK used for?

Since Android apps are written in Java , you will need the Oracle Java compiler and libraries on your system. These are collectively called the Java Development Kit or “JDK” for short. (If you are certain that you already have JDK 1.8 or higher on your computer, such as from taking CS 106A, you can skip to Step 2.)

The JDK is a development environment for building applications, applets, and components using the Java programming language . The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the Java platform.

Writing Java applets and applications needs development tools like JDK . The JDK includes the Java Runtime Environment, the Java compiler and the Java APIs. For Java Developers. Includes a complete JRE plus tools for developing, debugging, and monitoring Java applications.