![]() In addition, two key deployment technologies are part of the JRE: Java Plug-in, which enables applets to run in popular browsers and Java Web Start, which deploys standalone applications over a network. JDK and JRE To explain the difference between JDK and JRE, the best is to read the Oracle documentation and consult the diagram: Java Runtime Environment (JRE) The Java Runtime Environment (JRE) provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language. Indeed there are specific implementations of the JVM for different systems (Windows, Linux, MacOS, see the wikipedia list.), the aim is that with the same bytecodes they all give the same results. It's also the entity that allows Java to be a 'portable language' (write once, run anywhere). The JVM doesn't understand Java typo, that's why you compile your.java files to obtain.class files that contain the bytecodes understandable by the JVM.
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