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最新推荐文章于 2024-04-22 14:31:28 发布

lijun0988

最新推荐文章于 2024-04-22 14:31:28 发布

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分类专栏： code 文章标签： exception thread class

本文链接：https://blog.youkuaiyun.com/lijun0988/article/details/7978322

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public 
void testAB() {
        final
Lock3 lock = new
Lock3();
        Thread a =
new Thread() {
            public
void run() {
                    for
(int 
i=1;i<100;i++) {
                        lock.lockA();
                        for
(int 
j=0;j<i;j++) {
                            System.out.print("A");
                        }
                        System.out.println();
                        lock.unlockA();
                    }
            }
        };
        Thread b =
new Thread() {
            public
void run() {
               for
(int 
i=1;i<100;i++) {
                    lock.lockB();
                    for
(int 
j=0;j<i;j++) {
                        System.out.print("B");
                    }
                    System.out.println();
                    lock.unlockB();
                }
            }
        };
        a.start();b.start();
        try
{ a.join(); b.join(); } catch(Exception e) {}
    }
    
     
    public
static class 
Lock3 {
        boolean
isAB = true;//true is A, false is B
         
        public
synchronized void
lockA()  {
            while
(isAB == false) {
               try
{ wait(); } catch(Exception e) {}
            }
            isAB =
true; //current is A
        }
         
        public
synchronized void
lockB()  {
            while
(isAB == true) {
               try
{ wait(); } catch(Exception e) {}
            }
            isAB =
false; //current is B
        }
         
        public
synchronized void
unlockA() {
            isAB =
false; //change to B
            notify();
        }
         
        public
synchronized void
unlockB() {
            isAB =
true; //change to A
            notify();
        }
    }