How does a java program run?

The java program execution process is divided into two steps. The following figure is a schematic diagram of the process

The first step: convert the java source code (.java file) Compile it into a JVM file (.class file) through the compiler (javac.exe)

Step 2: Execute the JVM file through java.exe and output the result (Recommended learning: java course )

Through the above analysis, we found that the JVM is very important. It shields the differences in operating systems. It is precisely because of this role of the JVM that Java programming is The language can achieve cross-platform, and its principle can be roughly described as follows:

Handwritten java source program

1. Use notepad to handwrite a java program and save it as JavaRunProcess.java.

Tip: The file name should be consistent with the class name as much as possible

//测试java运行过程
public class JavaRunProcess {
    public static void main(String[] args){
        System.out.println("Test java Runing Process");
    }
}

## 2. Use javac.exe to copy the JavaRunProcess.java you just saved The file is compiled into a JavaRunProcess.class file

##3.java.exe executes the JavaRunProcess.class file and outputs the result

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