Java两个线程交替打印输出a1b2c3d4

1、线程1负责输出abcd

public class Thread1 extends Thread {
    //定义锁对象，负责接收传入对象
    private final Object lock;
    //定义共有构造方法
    public Thread1(Object lock) {
        // TODO Auto-generated constructor stub
        this.lock = lock;
    }

    @Override
    public void run() {
        String[] string = {"a", "b", "c", "d"};
        for (int i = 0; i < string.length; i++) {
            synchronized (lock) {
                //线程1开始执行
                lock.notify();
                try {
                    //线程1开始等待
                    lock.wait();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                //线程1继续执行
                System.out.print(string[i]);
                //线程1运行结束
                lock.notify();
            }
        }
    }
}

2、线程2负责输出1234

public class Thread2 extends Thread {
    //定义锁对象，负责接收传入对象
    private final Object lock;
    //定义共有构造方法
    public Thread1(Object lock) {
        // TODO Auto-generated constructor stub
        this.lock = lock;
    }

    @Override
    public void run() {
        String[] string = {"1", "2", "3", "4"};
        for (int i = 0; i < string.length; i++) {
            synchronized (lock) {
                //线程2开始执行
                lock.notify();
                try {
                    //线程2开始等待
                    lock.wait();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                //线程2继续执行
                System.out.print(string[i]);
                //线程2运行结束
                lock.notify();
            }
        }
    }
}

3、创建测试类

public class Test {
    public static void main(String[] args){
        // TODO Auto-generated method stub
        final Object lock = new Object();
        Thread1 t1 = new Thread1(lock);
        Thread2 t2 = new Thread2(lock);
        t1.start();
        t2.start();
    }
}

输出结果