Thread类中有一个join方法:
- join():在线程a中调用线程b的join(),此时线程a就进入阻塞状态,直到线程b执行完成以后,线程a才结束阻塞状态。
下面介绍2种写法:
写法1:
public class JoinTest {
public static void main(String[] args) {
Join t1 = new Join();
Join t2 = new Join();
Join t3 = new Join();
t1.setName("线程1");
t2.setName("线程2");
t3.setName("线程3");
t1.setPriority(Thread.MIN_PRIORITY);//1
t2.setPriority(5);
t3.setPriority(Thread.MAX_PRIORITY);//10
t1.start();
try {
t1.join();
System.out.println("------------------------");
} catch (InterruptedException e) {
e.printStackTrace();
}
t2.start();
try {
t2.join();
System.out.println("------------------------");
} catch (InterruptedException e) {
e.printStackTrace();
}
t3.start();
}
}
class Join extends Thread{
@Override
public void run() {
for (int i = 1; i <=10 ; i++) {
System.out.println(getName()+":"+i);
}
}
}
写法2:
public class JoinTest {
public static void main(String[] args) {
Thread t1 = new Thread(new Runnable() {
@Override
public void run() {
System.out.println("t1");
}
}, "线程1");
Thread t2 = new Thread(() -> {
try {
t1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("t2");
}, "线程2");
Thread t3 = new Thread("线程3") {
@Override
public void run() {
try {
t2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("t3");
}
};
t1.setPriority(1);
t2.setPriority(5);
t3.setPriority(10);
t3.start();
t2.start();
t1.start();
}
}