How does compilation and execution of a Java program work?

Java, being a platform independent programming language, doesn’t work on one-step-compilation. Instead, it involves a two-step execution, first through an OS independent compiler; and second, in a virtual machine (JVM) which is custom-built for every operating system. The two principle stages are explained below: Compilation

Why are JIT compilers used instead of JVM?

When using a JIT compiler, the hardware can execute the native code, as opposed to having the JVM interpret the same sequence of bytecode repeatedly and incurring the penalty of a relatively lengthy translation process. This can lead to performance gains in the execution speed, unless methods are executed less frequently.

How is the main class loaded in JVM?

The main class is loaded into the memory by passing its ‘.class’ file to the JVM, through invoking the latter. All the other classes referenced in the program are loaded through the class loader. A class loader, itself an object, creates a flat name space of class bodies that are referenced by a string name. The method definition is:

Which is the first stage of compilation in Java?

The two principle stages are explained below: First, the source ‘.java’ file is passed through the compiler, which then encodes the source code into a machine independent encoding, known as Bytecode. The content of each class contained in the source file is stored in a separate ‘.class’ file.

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Frequently Asked Questions

How does compilation and execution of a Java program work?

Java, being a platform independent programming language, doesn’t work on one-step-compilation. Instead, it involves a two-step execution, first through an OS independent compiler; and second, in a virtual machine (JVM) which is custom-built for every operating system. The two principle stages are explained below: Compilation
Why are JIT compilers used instead of JVM?

When using a JIT compiler, the hardware can execute the native code, as opposed to having the JVM interpret the same sequence of bytecode repeatedly and incurring the penalty of a relatively lengthy translation process. This can lead to performance gains in the execution speed, unless methods are executed less frequently.
How is the main class loaded in JVM?

The main class is loaded into the memory by passing its ‘.class’ file to the JVM, through invoking the latter. All the other classes referenced in the program are loaded through the class loader. A class loader, itself an object, creates a flat name space of class bodies that are referenced by a string name. The method definition is:
Which is the first stage of compilation in Java?

The two principle stages are explained below: First, the source ‘.java’ file is passed through the compiler, which then encodes the source code into a machine independent encoding, known as Bytecode. The content of each class contained in the source file is stored in a separate ‘.class’ file.