멀티 쓰레드

import java.util.concurrent.locks.Condition;

import java.util.concurrent.locks.ReentrantLock;

 

class Info {

    String name;

    int value;

 

    // toString을 오버라이드를 했는데 해당 클래스를 출력하면 toString에 있는 내용이 기본적으로 출력

    @Override

    public String toString() {

        return (name +"(" + value +")");

    }

}

 

class Goods {

    Info info;

    private boolean isUploaded;

    // lock을 위한 ReentrantLock

    private final ReentrantLock locker =new ReentrantLock();

    // lock의 상태를 조정할 Condition

    private final Condition lockerCondition = locker.newCondition();

 

    Goods () {

        isUploaded =false;

        info =new Info();

    }

 

    public void setInfo (final String name,final int value) {

        info.name = name;

        info.value = value;

        isUploaded =true;

 

        locker.lock();

        try {

            lockerCondition.signalAll();

        }finally {

            locker.unlock();

        }

 

    }

 

    public Info getInfo() {

        if (isUploaded ==false) {

            locker.lock();

            try {

                lockerCondition.await();

            }catch (Exception ie) {

                ie.printStackTrace();

            }finally {

                locker.unlock();

            }

        }

        return info;

    }

}

 

class HomepageManagerextends Thread {

    private Goods goods;

    private String name;

    private int value;

    HomepageManager (final Goods goods,final String name,final int value) {

        this.goods = goods;

        this.name = name;

        this.value = value;

    }

 

    @Override

    public void run() {

        goods.setInfo(name, value);

    }

}

 

class CustomerViewerextends Thread {

    private Goods goods;

    private String id;

    CustomerViewer (final Goods goods,final String id) {

        this.goods = goods;

        this.id = id;

    }

 

    @Override

    public void run() {

        System.out.println(id +"가 보고있는 쇼핑몰 물품 내용 : " + goods.getInfo());

    }

}

 

public class Test1 {

    public static void main(String[] args) {

        Goods goods =new Goods();

        HomepageManager homepageManager =new HomepageManager(goods,"태블릿",100000);

        CustomerViewer customerViewer1 =new CustomerViewer(goods,"채숨실");

        CustomerViewer customerViewer2 =new CustomerViewer(goods,"이세상바꾼애");

 

        try {

            customerViewer1.start();

            customerViewer2.start();

            homepageManager.start();

 

            customerViewer1.join();

            customerViewer2.join();

            homepageManager.join();

        }catch (InterruptedException ie) {

            ie.printStackTrace();

        }

    }

}

출처: http://eskeptor.tistory.com/83 [Hello World]

http://eskeptor.tistory.com/79