多线程打印：写两个线程，一个线程打印 1~52，另一个线程打印字母A-Z。打印顺序为12A34B56C……5152Z。

喜欢ヅ旅行 2024-04-19 11:25 83阅读 0赞

方法1： wait,notify, synchronized

package com.hnist.lzn.thread;
    
    public class PrintThread {
        /*
        写两个线程，一个线程打印 1~52，另一个线程打印字母A-Z。
        打印顺序为12A34B56C……5152Z。
         */
        static boolean index = true;
    
        static String str = "A";
        static class A implements Runnable{
            int i  = 1;
            @Override
            public void run() {
    
                synchronized (str){
    
                    while(i <= 52){
    
                        if(index){
    
                            System.out.println(i++);
                            System.out.println(i++);
                            index = !index;
                            str.notify();
                        }else{
                            try{
    
                            str.wait();
                            }catch (Exception e){
    
                            }
    
                        }
    
    
                    }
    
    
                }
    
            }
        }
    
    
        static class B implements Runnable{
    
            int i = 0;
            @Override
            public void run() {
    
                synchronized(str){
    
                    while(i < 26){
    
                        if(!index){
    
                            System.out.println((char)(str.charAt(0)+i++));
                            index = !index;
                            str.notify();
                        }else{
    
                            try{
    
                               str.wait();
                            }catch (Exception e){
    
                            }
    
                        }
    
                    }
    
                }
    
            }
        }
    
        public static void main(String[] args) {
    
            Thread th1 = new Thread(new A());
            Thread th2 = new Thread(new B());
            th1.start();
            th2.start();
        }
    
    
    }

方法二：ReentrantLock condition

package com.hnist.lzn.thread;
    
    import java.util.concurrent.ExecutionException;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    
    public class Condition {
    
        /*
        写两个线程，一个线程打印 1~52，另一个线程打印字母A-Z。
        打印顺序为12A34B56C……5152Z。
        用Conditon 实现
         */
        static Lock lock = new ReentrantLock();
        static java.util.concurrent.locks.Condition printcondi = lock.newCondition();
        static java.util.concurrent.locks.Condition printChar = lock.newCondition();
        static boolean index = true;
        static String str = "A";
    
    
        static class PrintNumber implements Runnable{
    
            int i = 1;
            @Override
            public void run() {
    
                lock.lock();
                try{
    
                    while(i <= 52)
                    {
                        if(index){
    
                            System.out.println(i++);
                            System.out.println(i++);
                            index = !index;
                            printChar.signal();
                        }else{
    
                            printcondi.await();
    
                        }
    
    
                    }
    
                }catch (Exception e){
    
                }finally {
                    lock.unlock();
                }
    
            }
        }
    
        static class PrintChar implements Runnable{
    
            int i = 0;
            @Override
            public void run() {
    
                lock.lock();
                try{
    
                  while(i < 26){
    
                     if(!index){
    
                         System.out.println((char)(str.charAt(0)+i));
                         i++;
                         index = !index;
                         printcondi.signal();
                     }else{
    
                         printChar.await();
                     }
                  }
    
                }catch (Exception e){
    
                }finally {
                    lock.unlock();
                }
    
            }
        }
    
        public static void main(String[] args) {
    
            Thread th1 = new Thread(new PrintNumber());
            Thread th2 = new Thread(new PrintChar());
            th1.start();
            th2.start();
    
        }
    
    }