两个线程交替打印1-100

public class Test {
    public static volatile int flag = 0;
    public static void main(String[] args) {
        new Thread(new Runnable1()).start();
        new Thread(new Runnable2()).start();
    }
}
class Runnable1 implements Runnable {
    @Override
    public void run() {
        int i = 1;
        while (i < 100) {
            if (Test.flag == 0) {
                System.out.println("线程1：" + i);
                i += 2;
                Test.flag = 1;
            }
        }
    }
}
class Runnable2 implements Runnable {
    @Override
    public void run() {
        int i = 2;
        while (i <= 100) {
            if (Test.flag == 1) {
                System.out.println("线程2：" + i);
                i += 2;
                Test.flag = 0;
            }
        }
    }
}

public class Test {
    public static void main(String[] args) {
        MyRunnable myRunnable = new MyRunnable();
        new Thread(myRunnable, "线程1").start();
        new Thread(myRunnable, "线程2").start();
    }
}
class MyRunnable implements Runnable {
    private int i = 1;
    @SneakyThrows
    @Override
    public void run() {
        while (i <= 100) {
            synchronized (this) {
                System.out.println(Thread.currentThread().getName() + "：" + i++);
                notify();
                if (i <= 100) {
                    wait();
                }
            }
        }
    }
}

public class Test {
    public static void main(String[] args) {
        MyRunnable myRunnable = new MyRunnable();
        new Thread(myRunnable, "线程1").start();
        new Thread(myRunnable, "线程2").start();
    }
}
class MyRunnable implements Runnable {
    private int i = 1;
    private ReentrantLock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();
    @Override
    public void run() {
        while (i <= 100) {
            lock.lock();
            System.out.println(Thread.currentThread().getName() + "：" + i++);
            condition.signal();
            try {
                if (i <= 100) {
                    condition.await();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                lock.unlock();
            }
        }
    }
}