线程间通信--等待唤醒机制

class Demo4 
{
    public static void main(String[] args) 
    {
        Res r = new Res();
        Input in  = new Input(r);
        Output out  = new Output(r);
        new Thread(in).start();
        new Thread(out).start();
    }
}
class Res
{
    String name;
    int age;
    boolean flag = false;
}
class Input implements Runnable
{
    Res r;
    Input(Res r){this.r = r;}
    public void run(){
        while(true){
            synchronized(r){
                if(r.flag == true){
                    try
                    {
                        r.wait();
                    }
                    catch (InterruptedException e)
                    {
                    }
                }else{
                    r.name = "kobe";
                    r.age = (int)(Math.random()*10);
                    r.flag = true;
                    r.notify();
                }
            }
        }
    }
}
class Output implements Runnable
{
    Res r;
    Output(Res r){this.r = r;}
    public void run(){
        while(true){
            synchronized(r){
                if(r.flag == true){
                    System.out.println(r.name + "::"+ r.age);
                    r.flag = false;
                    r.notify();
                }else{
                    try
                    {
                        r.wait();
                    }
                    catch (InterruptedException e)
                    {
                    }
                }
            }
        }
    }
}