Notifyl学习笔记

/**
     * @param args
     * 等待唤醒机制
     */
    public static void main(String[] args) {
        final Printer p = new Printer();

        new Thread() {
            public void run() {
                while(true) {
                    try {
                        p.print1();
                    } catch (InterruptedException e) {

                        e.printStackTrace();
                    }
                }
            }
        }.start();

        new Thread() {
            public void run() {
                while(true) {
                    try {
                        p.print2();
                    } catch (InterruptedException e) {

                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }

}

//等待唤醒机制
class Printer {
    private int flag = 1;
    public void print1() throws InterruptedException {                          
        synchronized(this) {
            if(flag != 1) {
                this.wait();                    //当前线程等待
            }
            System.out.print("白");
            System.out.print("日");
            System.out.print("一");
            System.out.print("山");
            System.out.print("过");
            System.out.print("\r\n");
            flag = 2;
            this.notify();                      //随机唤醒单个等待的线程
        }
    }

    public void print2() throws InterruptedException {
        synchronized(this) {
            if(flag != 2) {
                this.wait();
            }
            System.out.print("黄");
            System.out.print("河");
            System.out.print("入");
            System.out.print("海");
            System.out.print("流");
            System.out.print("\r\n");
            flag = 1;
            this.notify();
        }
    }
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