三线程连续打印ABC

package test5;

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

class PrintThread implements Runnable{

    private ReentrantLock lock=new ReentrantLock();
    Condition condition = lock.newCondition();
    private int state=0;
    
    @Override
    public void run() {
        String threadName=Thread.currentThread().getName();
        lock.lock();
        try {
            for(int i=0;i<9;i++){
                if(threadName.equals("A")){
                    while(state%3!=0){
                        condition.await();
                    }
                }else if(threadName.equals("B")){
                    while(state%3!=1){
                        condition.await();
                    }
                }else if(threadName.equals("C")){
                    while(state%3!=2){
                        condition.await();
                    }
                }
                state++;
                System.out.println(threadName);
                condition.signalAll();
            }
        } catch (Exception e) {
            // TODO: handle exception
        }finally{
            lock.unlock();
        }
        
        
    }

}

public class PrintABC{
    public static void main(String[] args) {
        PrintThread pt=new PrintThread();
        Thread t1=new Thread(pt,"A");
        Thread t2=new Thread(pt,"B");
        Thread t3=new Thread(pt,"C");
        t1.start();
        t2.start();
        t3.start();
    }
}

 一条线程连续打印ABC:

class PrintABC implements Runnable{

    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();
    
    @Override
    public void run() {
        String threadName = Thread.currentThread().getName();
        lock.lock();
        int state = 0;
        try{
            while(state < 10){
                if(state % 3 == 0){
                    System.out.print("A ");
                }else if(state % 3 == 1){
                    System.out.print("B ");
                }else if(state % 3 == 2){
                    System.out.print("C ");
                }
                state++;
            }
            
        }finally {
            lock.unlock();
        }
    }
    
}
public class ThreadDemo {

    public static void main(String[] args) {
        PrintABC p = new PrintABC();
        Thread t = new Thread(p);
        t.start();
    }
}