Java多线程2--线程控制

1、sleep()方法

sleep()是一个静态方法，可以通过类名直接调用，会抛出InterruptedException

public class testSleep {

public static void main(String[] args) {
subThread st = new subThread();
Thread t = new Thread(st);
t.start();
try {
//主进程sleep5s，然后调用thread类的interrupt方法，
//t catch到InterruptedException，结束死循环
Thread.sleep(5000);
t.interrupt();
} catch (InterruptedException e) {
e.printStackTrace();
}

}

}
class subThread implements Runnable{
public void run() {
while(true){
System.out.println("subThread is running");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
return;
}
}
}
}

输出应该为5行“subThread is running”

2、join()方法

将一个进程合并到另一个进程中，相当于直接调用run()方法

public class testJoin {

public static void main(String[] args) throws InterruptedException {
subThread1 st = new subThread1();
Thread t = new Thread(st);
System.out.println("MainThread:1");
t.start();
t.join();
System.out.println("MainThread:2");
}

}
class subThread1 implements Runnable{
public void run() {
for(int i=0;i<3;i++){
System.out.println("subThread:"+i);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

}
}

运行结果为：MainThread:1
subThread:0
subThread:1
subThread:2
MainThread:2

3、yield()方法

yield()方法用于让出cpu时间片给其他进程

4、setPriority()和getPriority()

设置进程优先级，优先级越高得到的cpu执行的时间片就越多，具体多少由操作系统分配

进程的优先级最高为10，最低为1，缺省值为5