线程通讯三种方式

public class Test {
    static Thread t1=null,t2=null;
    public static void main(String[] args) {
        //1a2b3c4d交替执行
        final Object o = new Object();
        char[] c1="1234".toCharArray();
        char[] c2="abcd".toCharArray();
        //线程t1
        t1=new Thread(()->{
            synchronized (o){
                for (char c:c1){
                    System.out.println(c);
                    try {
                        o.notify();
                        Thread.sleep(1000);//休眠1s
                        o.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                o.notify();
            }
        },"t1");
        //线程t2
        t2=new Thread(()->{
            synchronized (o){
                for (char c:c2){
                    System.out.println(c);
                    try {
                        o.notify();
                        Thread.sleep(1000);
                        o.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                o.notify();
            }
        },"t2");
        t1.start();
        t2.start();
    }
}

public class Test2 {
    //定义一个共享变量实现通信
    static volatile boolean notice=false;
    static Thread t1=null,t2=null;
    public static void main(String[] args) {
        char[] c1="1234".toCharArray();
        char[] c2="abcd".toCharArray();
        t1=new Thread(()->{
            System.out.println("线程t1开始执行");
            for (char c:c1){
                System.out.println(c);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                while (c==‘4‘){
                    notice=true;
                    break;
                }
            }
        });
        t2=new Thread(()->{
            while (true){
                if (notice){
                    System.out.println("线程t2收到通知，开始执行");
                    for (char c:c2){
                        System.out.println(c);
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    break;
                }
            }
        });
        t2.start();
        t1.start();
    }
}

public class Test3 {
    static Thread t1=null,t2=null;
    public static void main(String[] args) {
        //1a2b3c4d交替执行
        char[] c1="1234".toCharArray();
        char[] c2="abcd".toCharArray();
        ReentrantLock lock = new ReentrantLock();
        Condition condition = lock.newCondition();
        //线程t1
        t1=new Thread(()->{
            lock.lock();
                for (char c:c1){
                    System.out.println(c);
                    try {
                        condition.signal();
                        Thread.sleep(1000);//休眠1s
                        condition.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                lock.unlock();
        });
        //线程t2
        t2=new Thread(()->{
            lock.lock();
                for (char c:c2){
                    System.out.println(c);
                    try {
                        condition.signal();
                        Thread.sleep(1000);
                        condition.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                lock.unlock();
        });
        t1.start();
        t2.start();
    }
}