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- What is the difference between JDK, JRE and JVM?
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The JVM runs Java bytecode; the JRE is the JVM plus the standard libraries needed to run programs; the JDK is the JRE plus development tools like javac.
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Think of it as layers: JDK ⊃ JRE ⊃ JVM. You install the JDK to write code and the JRE to only run it.
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