The full form of JVM stands for Java Virtual Machine. It is an abstract machine that executes Java bytecode. Bytecode is a machine-independent format that can be interpreted by any virtual machine. This makes Java code platform-independent, meaning that it can run on any operating system that has a java virtual machine installed.
The machine is responsible for loading, verifying, and executing its bytecode. It also manages memory, garbage collection, and other tasks.
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The machine is divided into five main parts:
- Class loader: The class loader loads Java classes into memory.
- Runtime data area: This area stores all the data that is needed to execute a Java program, such as class variables, method arguments, and return values.
- Instruction set interpreter: This part of the virtual machine interprets Java bytecode and executes it.
- Garbage collector: The garbage collector manages memory by automatically deleting objects that are no longer needed.
- Native interface: This part of the machine allows Java code to call native code, which is code that is written in a language other than Java.
The machine is a critical part of the Java platform. It is responsible for making Java code platform-independent and for providing a runtime environment for Java programs.
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Here are some of the benefits of JVM –
- Platform independence: Java code can run on any operating system that has a JVM installed.
- Security: The JVM has a built-in security mechanism that helps to protect against malicious code.
- Performance: The JVM is optimized for performance, so Java programs can run quickly.
- Portability: Java code can be easily ported to other platforms.
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Here are some of the uses of JVM –
- Developing and running Java applications.
- Creating Java applets.
- Creating Java games.
- Developing and running Java-based web applications.
- Developing and running Java-based mobile applications.
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