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();
    }
}