java-多线程4

等待唤醒机制

package test;

/*
 * 生产者消费者问题
 * 分析：
 *             资源类：Student
 *             设置学生数据：SetThread(生产者)
 *             获取学生数据：GetThread(消费者)
 *             测试类：Test01
 * */

public class Test01{
    public static void main(String[] args) {
        Student s=new Student();
        
        SetThread st=new SetThread(s);
        GetThread gt=new GetThread(s);
        
        Thread t1=new Thread(st);
        Thread t2=new Thread(gt);
        
        t1.start();
        t2.start();
    }
}

package test;

public class Student {
     String name;
     int age;
     boolean flag;  //默认是false;
}

package test;

public class SetThread implements Runnable {
    private Student s;
    private int x = 0;

    public SetThread(Student s) {
        this.s = s;
    }

    @Override
    public void run() {
        while (true) {
            // TODO Auto-generated method stub
            synchronized (s) {
                if(s.flag){
                    try {
                        s.wait();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                if (x % 2 == 0) {
                    s.name = "hello";
                    s.age = 22;
                } else {
                    s.name = "龙头";
                    s.age = 10;
                }
                x++;
                
                s.flag=true;
                s.notify();
            }
        }
    }
}

package test;

public class GetThread implements Runnable{
    private Student s;
    
    public GetThread(Student s){
        this.s=s;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(true){
            synchronized (s) {
                if(!s.flag){
                    try {
                        s.wait();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                System.out.println(s.name + "--" + s.age);
                s.flag=false;
                s.notify();
            }
        }
        
    }
}