sleep()&yield()&join()&优先级

最新推荐文章于 2023-09-20 21:38:50 发布

原创最新推荐文章于 2023-09-20 21:38:50 发布 · 278 阅读

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本文详细介绍了Java中线程的几种控制方法，包括Thread.sleep()用于暂停当前线程、Thread.yield()让出CPU使用权、Thread.join()等待其他线程结束及设置线程优先级等，通过实例演示了这些方法的具体应用。

//静态Thread.sleep()方法的使用
import java.util.*;
public class TestInterrupt {
public static void main(String[] args) {
    MyThread thread = new MyThread();
    thread.start();
    try {
    Thread.sleep(10000);
    }catch (InterruptedException e) {}
    thread.interrupt();
}
}

class MyThread extends Thread {
boolean flag = true;

public void run(){
    while(flag){
      System.out.println("==="+new Date()+"===");
      try {
        sleep(1000);
      } catch (InterruptedException e) {
        return;
      }
    }
}
}
/*
public void run() {
    while (true) {
      String temp = new Date().toString();
      String t = temp.substring(11, temp.indexOf('C'));
      t = t.trim();
      String[] time = t.split(":");
      if (time.length == 3) {
        System.out.println(“现在是” + time[0] + “点” +
                  time[1] + "分" + time[2] + "秒");
      }
      try {
        Thread.sleep(5000);
      } catch (InterruptedException e) {
        return;
      }
    }
}
}
*/

===============================================================================

//yield()方法：让出cpu
public class TestYield {
public static void main(String[] args) {
    MyThread3 t1 = new MyThread3("t1");
    MyThread3 t2 = new MyThread3("t2");
    t1.start(); t2.start();
}
}
class MyThread3 extends Thread {
MyThread3(String s){super(s);}
public void run(){
    for(int i =1;i<=100;i++){
      System.out.println(getName()+": "+i);
      if(i%10==0){
        yield();
      }
    }
}
}
==================================================================================

//join()方法：合并某个线程
public class TestJoin {
public static void main(String[] args) {
    MyThread2 t1 = new MyThread2("abcde");
    t1.start();
    try {
    t1.join();
    } catch (InterruptedException e) {}

    for(int i=1;i<=10;i++){
      System.out.println("I am main thread");
    }
}
}
class MyThread2 extends Thread {
MyThread2(String s){
super(s);
}

public void run(){
    for(int i =1;i<=10;i++){
      System.out.println("I am "+getName());
      try {
      sleep(1000);
      } catch (InterruptedException e) {
      return;
      }
    }
}
}
====================================================================

//priority优先级
public class TestPriority {
public static void main(String[] args) {
  Thread t1 = new Thread(new T1());
  Thread t2 = new Thread(new T2());
  t1.setPriority(Thread.NORM_PRIORITY + 3);//线程t1获取的cpu多一点
  t1.start();
  t2.start();
}
}

class T1 implements Runnable {
public void run() {
  for(int i=0; i<1000; i++) {
   System.out.println("T1: " + i);
  }
}
}

class T2 implements Runnable {
public void run() {
  for(int i=0; i<1000; i++) {
   System.out.println("------T2: " + i);
  }
}
}