运行机制

public class Hello {

public static void main (String[] args) {
	System.out.println("Jessica is a student");
	 }

}

public class dog{

​ public Static void main (String[] args){

​ System.out.println("hello,狗~");

​ }

}

编译运行1. javac Hello.java 回车
2.java Hello 回车 / Java dog 回车
java(文件)——Javac(编译)-class——java(运行)----结果