交替输出abc

package cn.meowrain;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class WaitNotify {
    private int loopNumber;
    private int flag;
    public WaitNotify(int loopNumber, int flag) {
        this.flag = flag;
        this.loopNumber = loopNumber;
    }

    public void print(String str,int waitFlag,int nextFlag) {
        for (int i = 0; i < loopNumber; i++) {
            synchronized (this) {
                while (waitFlag != flag) {
                    try{
                        this.wait();
                    }catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.print(str);
                flag = nextFlag;
                this.notifyAll();
            }
        }
    }
    public static void main(String[] args) {
        WaitNotify waitNotify = new WaitNotify(5,1);
        new Thread(()->{
            waitNotify.print("a",1,2);
        }).start();
        new Thread(()->{
            waitNotify.print("b",2,3);
        }).start();
        new Thread(()->{
            waitNotify.print("c",3,1);
        }).start();
    }
}

package cn.meowrain;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

@Slf4j
public class AwaitSignal extends ReentrantLock {
    private int loopNumber;

    public AwaitSignal(int loopNumber) {
        this.loopNumber = loopNumber;
    }

    public void print(String str, Condition thisCondition, Condition nextCondition) {
        for (int i = 0; i < loopNumber; i++) {
            try {
                lock();
                thisCondition.await();
                System.out.print(str);
                nextCondition.signal();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                unlock();
            }
        }
    }
}

class Tests {
    public static void main(String[] args) {
        AwaitSignal signal = new AwaitSignal(5);

        Condition a = signal.newCondition();
        Condition b = signal.newCondition();
        Condition c = signal.newCondition();
        new Thread(() -> signal.print("a", a, b)).start();
        new Thread(() -> signal.print("b", b, c)).start();
        new Thread(() -> signal.print("c", c, a)).start();
        try {
            TimeUnit.SECONDS.sleep(1);
            signal.lock();
            a.signal();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } finally {
            signal.unlock();
        }
    }
}

package cn.meowrain;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.LockSupport;

public class ParkUnPark {
    private final int loopNumber;
    public ParkUnPark(int loopNumber) {
        this.loopNumber = loopNumber;
    }
    public void print(String str,Thread next) {
        for (int i = 0; i < loopNumber; i++) {
            LockSupport.park();
            System.out.print(str);
            LockSupport.unpark(next);
        }
    }
}
class Tests2 {
    static Thread t1;
    static Thread t2;
    static Thread t3;
    public static void main(String[] args) throws InterruptedException {

        ParkUnPark parkUnPark = new ParkUnPark(5);
        t1 = new Thread(() -> parkUnPark.print("a", t2));
        t2 = new Thread(() -> parkUnPark.print("b", t3));
        t3 = new Thread(() -> parkUnPark.print("c", t1));
        t1.start();
        t2.start();
        t3.start();
        TimeUnit.SECONDS.sleep(1);
        LockSupport.unpark(t1);

    }
}