线程常用方法

守护线程、用户线程

线程默认的都是用户线程，我们需要设置thread.setDaemon(true)来改为守护线程;

守护线程,虚拟机不会监测它，等别的线程都跑完了,守护线程会自动停止;

  public static void main(String[] args) {

        Teacher teacher = new Teacher();
        Thread thread = new Thread(teacher);
        // TODO 老师设置为守护线程
        thread.setDaemon(true);
        thread.start();
        Student student = new Student();
        new Thread(student).start();
    }

    static class Student implements Runnable{

        @Override
        public void run() {
            for (int i = 0; i < 1000; i++) {
                System.out.println("学生到家了!");
            }
            System.out.println("------------------------------------");
        }
    }
    static class Teacher implements Runnable{

        @Override
        public void run() {
            // 死循环,但是因为是守护线程,虚拟机不会监测它，等别的线程都跑完了,守护线程会自动停止;
            while(true){
                System.out.println("老师送学生回家!");
            }
        }
    }

线程礼让yield

Thread.yield();

礼让不一定成功,只是优先级的变化,还是看cpu的调度;

线程插队join

Thread.join();

少用，会导致阻塞，了解即可;

线程状态

Thread.getState();

优先级priority

getPriority(),setPriority(int XXX)

先设置优先级,在启动,优先级只有1~10,默认是5;也不一定优先级高的肯定会跑,看cpu心情;