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Module 1: Introduction to Java

20267m

A Java program is required to run on different operating systems without recompilation of the source code. Analyse the role of bytecode, JVM and JDK in achieving Java's platform-independent execution model.

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Bytecode, JVM and JDK

  1. Source: The programmer writes .java files.
  2. Compiler: javac (part of the JDK) compiles source into bytecode in .class files.
  3. JVM: A platform-specific JVM loads, verifies and executes bytecode, interpreting it or compiling hot code with a JIT compiler.
  4. JDK: The Java Development Kit contains development tools such as javac, runtime components and debugging/documentation tools. The JVM is the execution engine, not the compiler.
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Thus Java source generally need not be recompiled for each OS, provided a compatible JVM and required libraries are available.

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