Question

JAVA双线程 用两个线程交替打印从1到100。 如：线程1 1 线程2 2

JAVA双线程
用两个线程交替打印从1到100。
如：线程1 1
线程2 2
线程1 3
谢谢。

Answer 1

public class Spider {
    class Egg implements Runnable {
        String name;
        public Egg(String name) {
            this.name = name;
        }
        Thread thread;
        public void start() {
            if (null == thread) {
                thread = new Thread(this);
                thread.setName(name);
                thread.start();
            }
        }
        public synchronized void stop() {
            if (null != thread) {
                thread.interrupt();
                thread = null;
                notifyAll();
            }
        }
        public void run() {
            Thread me = Thread.currentThread();
            while (me == thread) {
                if (count > 99) {
                    stop();
                    break;
                }
                try {
                    Thread.sleep(50);
                } catch (Exception e) {}
                System.out.println(me.getName() + " " + count++);
            }
        }
    }
    int count = 1;
    public Spider(int num) {
        for (int i = 0; i < num; i++) {
            Egg egg = new Egg("线程" + (i + 1));
            egg.start();
        }
    }
    public static void main(String[] args) {
        new Spider(2);
    }
}

Answer 2

通过公平锁实现
import java.util.concurrent.locks.ReentrantLock;

public class FairLock implements Runnable {
private static ReentrantLock fairLock = new ReentrantLock(true);
private static int i = 1;
@Override
public void run() {
while(i < 100){
try{
fairLock.lock();
System.out.println(Thread.currentThread().getName()+" " + i++);
}finally{
fairLock.unlock();
}
}
}

public static void main(String[] args) throws InterruptedException {
FairLock r1 = new FairLock();
Thread t1=new Thread(r1,"Thread_t1");
Thread t2=new Thread(r1,"Thread_t2");
t1.start();t2.start();
}
}