线程分为用户线程和守护线程，如果代码中不特殊设置一般都为用户线程。
虚拟机必须确保用户线程执行完毕
虚拟机不必等待守护线程执行完毕
一般用在监控记录等需求中
package com.example.demo.thread;
/**
* @projectName: demo
* @package: com.example.demo.thread
* @className: TestDeamon
* @author:
* @description: 测试守护线程
* @date: 2021/12/7 22:17
*/
public class TestDeamon {
public static void main(String[] args) {
Teacher teacher = new Teacher();
Student student = new Student();
Thread threadT = new Thread(teacher);
threadT.setDaemon(true);
threadT.start();
new Thread(student).start();
}
}
class Teacher implements Runnable {
@Override
public void run() {
while (true) {
try {
Thread.sleep(500);
System.out.println("老师在监考");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Student implements Runnable {
@Override
public void run() {
for (int i = 1; i < 5; i++) {
try {
Thread.sleep(1000);
System.out.println("学生在考试：完成第" + i + "题");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("考试完成！");
}
}
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