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JAVA Ecosystem - What are JAVA , JRE , JVM and JDK ????

If you are new to JAVA programming then you would often find the following terms confusing. JAVA , JRE , JVM and JDK. They all seem to be same. Following is the link from Oracle's website that gives a very authentic definition of each of these terms and also gives an overall understanding of the JAVA Ecosystem. http://docs.oracle.com/javase/8/docs/index.html