wait和notify

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public class Input implements Runnable {    private Person person;    private int nameIndex;    public Input(Person person) {        this.person = person;    }    public void run() {        synchronized (person) {            while (true) {                if (person.isFlag()) {                    try {                        person.wait();                        System.out.println("input receive output notify");                    } catch (InterruptedException e) {                        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.                    }                }                person.setName("name:"+nameIndex++);                System.out.println("input:name " + person.getName());                person.setFlag(true);                person.notify();                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.                }            }        }    }}

public class Output implements Runnable {    private Person person;    public Output(Person person) {        this.person = person;    }    public void run() {        synchronized (person) {            while (true) {                if (!person.isFlag()) {                    try {                        person.wait();                        System.out.println("output receive intput notify");                    } catch (InterruptedException e) {                        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.                    }                }                System.out.println("output:name " + person.getName());                person.setFlag(false);                person.notify();                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.                }            }        }    }}

public class Person {    private String name;    private boolean flag;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public boolean isFlag() {        return flag;    }    public void setFlag(boolean flag) {        this.flag = flag;    }}

public class TestDemo {    public static void main(String[] args) {        Person person = new Person();        Input input = new Input(person);        Output output = new Output(person);        Thread thread1 = new Thread(input);        Thread thread2 = new Thread(output);        thread1.start();        thread2.start();        //thread1先运行到  synchronized (person) ，取得对象锁，thread2阻塞，thread1设置name=  "name:0"   ,flag = true        //thread1调用notify，此时等待队列中没有线程        // thread1调用person.wait(),释放 synchronized锁，进入等待队列，此时thread2获取synchronized锁，        // thread2打印name   ,设置flag = false  ，调用notify，此时等待队列中的thread1，被唤醒，打印“input receive output notify” 没有获取synchronized锁        //thread2 调用person.wait()， 释放 synchronized锁，进入等待队列，此时thread1获取synchronized锁    }}

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