![]() ![]() It has everything the JRE has, but also the compiler (javac) and tools (like javadoc and jdb). It is capable of creating and compiling programs. The new Oracle Technology Network License Agreement for Oracle Java SE is substantially different from prior Oracle JDK licenses. ![]() The new license permits certain uses, such as personal use and development use, at no cost - but other uses authorized under prior Oracle JDK licenses may no longer be available. Sometimes, even if you are not planning to do any Java development on a computer, you still need the JDK installed. Why would you need the JDK then? Because the application server will convert JSP into Java servlets and needs to use the JDK to compile the servlets.įor example, if you are deploying a web application with JSP, you are technically just running Java programs inside the application server. Java is a programming language and software platform. ![]() Examples of applications that use Java are numerous and widespread but include web browsers, office applications and even mainstream games like Minecraft are based on Java. The Java Runtime Environment or JRE contains everything required to run Java applications on your system. The JRE software package includes the Java Virtual Machine (JVM), the Java Class Library, the Java command, and other infrastructure. JRE cannot be used to create new programs. The Java Development Kit (JDK) is the full-featured software development kit for Java developers. It has everything the JRE has, but adds the compiler (javac) and tools (like javadoc and jdb). The JDK allows you to create and compile Java programs. Unless you are a software developer, you only need to install Java JRE in your system to run Java programs. ![]()
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