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Bootstrap Class Loader - This is the root class loader.

There are three built-in class loaders available in Java: Loading involves taking the binary representation (bytecode) of a class or interface with a particular name, and generating the original class or interface from that. There are three phases in the class loading process: loading, linking, and initialization. The first class to be loaded into memory is usually the class that contains the main() method. When you try to use this class in your program, the class loader loads it into the main memory.

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java source file, it is converted into byte code as a. Let's take a look at each of them in more detail. The JVM consists of three distinct components: This space can be used to execute Java programs irrespective of the platform or operating system of the machine. Similar to virtual machines, the JVM creates an isolated space on a host machine. The same class file can be executed on any version of JVM running on any platform and operating system. This class file is then interpreted by the Java Virtual Machine for the underlying platform. Java code is first compiled into byte code to generate a class file. Java uses a combination of both techniques. These languages are called interpreted languages. On the other hand, in languages like JavaScript and Python, the computer executes the instructions directly without having to compile them. These languages are called compiled languages.

In programming languages like C and C++, the code is first compiled into platform-specific machine code. These virtual machines are isolated from each other.

We can call the virtual machine the guest machine, and the physical computer it runs on is the host machine.Ī single physical machine can run multiple virtual machines, each with their own operating system and applications. What is a Virtual Machine?īefore we jump into the JVM, let's revisit the concept of a Virtual Machine (VM).Ī virtual machine is a virtual representation of a physical computer. In this article, we will learn more about the JVM, how it works, and the various components that it is made of. All of these languages are collectively known as JVM languages. However, over the time, many other languages such as Scala, Kotlin and Groovy were adopted on the Java platform. JVM was initially designed to support only Java. You can write Java code on one machine, and run it on any other machine using the JVM.

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JVM is the core of the Java ecosystem, and makes it possible for Java-based software programs to follow the "write once, run anywhere" approach.

Whether you have used Java to develop programs or not, you might have heard about the Java Virtual Machine (JVM) at some point or another.