Java Virtual Machine (JVM), Difference JDK, JRE & JVM

Java Virtual Machine (JVM), Difference JDK, JRE & JVM

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  Java Virtual Machine (JVM),Difference JDK, JRE & JVM SOURCE: https://maccablo.com
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  How JVM works
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  PROCEDURE • After reading.class file, class loader save the corresponding byte code in the method area. Generally all JVMs have only one method area which is shared across classes which holds information related to each .class file. • Heap is an integral part of JVM memory in which the objects actually rests. JVM produces the Class object for each .class file. • Unlike Heap, Stack is used for storing temporary variables. • PC-Registers used to keep exact information of all instructions (which instruction is executing and which is going to be executed). • A native method used to access the runtime data of the JVM (java virtual machine). Native Method interface enables java code to call by the native applications (programs that are specific to the hardware and OS).
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  JRE ( JavaRuntime Environment ) • Java Runtime Environment is within which the java virtual machine actually runs. JRE contains Java virtual Machine and other files except development tools (debugger and compiler). So developer can run the source code in JRE but he/she cannot develop and compile the code.
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  JVM ( JavaVirtual Machine ) • JVM runs the program by using libraries and files provided by Java Runtime Environment.
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  JDK ( JavaDevelopment Kit ) • Java Development Kit can be considered as the super-set of JRE. JDK includes all features that JRE has and over and above it contains development tools such like compiler, debugger etc.
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  ARTICLE SOURCE https://maccablo.com/java-virtual-machine-jdk- jre-jvm/