Java线程yield和join总结
1.yield
- 线程礼让(让出cpu),让当前执行的线程暂停,但是不阻塞
- 让当前线程从执行状态转为就绪状态,等待cpu重新调度(不一定能礼让成功)
public class TestYeid {
public static void main(String[] args) throws InterruptedException {
new testThread("A").start();
new testThread("B").start();
}
}
class testThread extends Thread {
public testThread(String name) {
super(name);
}
@Override
public void run() {
System.out.println(Thread.currentThread().getName() + ":processing.");
Thread.yield();
System.out.println(Thread.currentThread().getName() + ":end.");
}
}
执行结果:
2.join
合并线程(可以理解为插队),当此线程执行完毕后,再执行其他线程(其他线程阻塞)
public class TestJoin {
public static void main(String[] args) throws InterruptedException {
Thread subThread = new Thread(new JoinThread());
subThread.start();
for (int i = 0; i < 100; i++) {
if (i == 10) {
System.out.println("subThread join!");
subThread.join();
} else {
System.out.println("main Thread:" + i);
}
}
}
}
class JoinThread implements Runnable {
@Override
public void run() {
for (int i = 0; i < 10000; i++) {
System.out.println("subThread:" + i);
}
}
}
执行结果: