使用Java线程锁方式打印十次ABC

喜欢ヅ旅行 2024-04-19 12:42 26阅读 0赞

package com.cw.thread;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    
    public class PrintABC { 
        private static Lock lock = new ReentrantLock();//通过JDK5中的锁来保证线程的访问的互斥
        private static int state = 0;
    
        static class ThreadA extends Thread { 
            @Override
            public void run() { 
                for (int i = 0; i < 10;) { 
                    lock.lock();
                    if (state % 3 == 0) { 
                        System.out.print("A");
                        state++;
                        i++;
                    }
                    lock.unlock();
                }
            }
        }
    
        static class ThreadB extends Thread { 
            @Override
            public void run() { 
                for (int i = 0; i < 10;) { 
                    lock.lock();
                    if (state % 3 == 1) { 
                        System.out.print("B");
                        state++;
                        i++;
                    }
                    lock.unlock();
                }
            }
        }
    
        static class ThreadC extends Thread { 
            @Override
            public void run() { 
                for (int i = 0; i < 10;) { 
                    lock.lock();
                    if (state % 3 == 2) { 
                        System.out.print("C");
                        state++;
                        i++;
                    }
                    lock.unlock();
                }
            }
        }
    
        public static void main(String[] args) { 
            new ThreadA().start();
            new ThreadB().start();
            new ThreadC().start();
        }
    }