Deep Research on Java Virtual machine

Java technology and Java virtual machines

The Java programming language is the first thought of Java, but in fact Java is a technology that consists of four aspects: the Java programming language, the Java class file format, the Java Virtual machine, and the Java application interface (Java API). Their relationships are shown in the following illustration:

Figure 1 Java four aspects of the relationship

The runtime environment represents the Java platform in which developers write Java code (. java files) and compile them into bytecode (. class files). The last byte code is loaded into memory, and once the bytecode enters the virtual machine, it is interpreted by the interpreter, or it is chosen by the Instant code generator to be converted into machine code execution. As you can see from the image above, the Java platform is built from Java virtual machines and Java application interfaces, and the Java language is the gateway to this platform, and programs written and compiled in the Java language can run on this platform. The structure of this platform is shown in the following illustration: