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java執行緒 存取錢問題

package com.qf.demo;
/**
 * 有一張銀行卡       那朋友存錢  女朋友取錢     多執行緒   並且實現同步操作
 * 
 * 資源共享
	有兩種操作    
 */
public class Thread4 {

	public static void main(String[] args) {
		Card card = new Card();
		
		BoyFriend boyFriend = new BoyFriend(card);
		GirlFriend girlFriend = new GirlFriend(card);
		
		// 
		Thread t = new Thread(boyFriend, "男朋友");
		Thread t2 = new Thread(girlFriend, "女朋友");
		
		t.start();
		t2.start();
		
		
	}
}
/**
 * 共享資源類
 */
class Card {
	
	private int money;

	public int getMoney() {
		return money;
	}

	public void setMoney(int money) {
		this.money = money;
	}
}
/**
 * 存錢類
*/

class  BoyFriend implements Runnable{
	// 將資源共享類作為操作類的屬性
	Card card;
	
	
	public Card getCard() {
		return card;
	}


	public BoyFriend(Card card) {
		super();
		this.card = card;
	}


	public void setCard(Card card) {
		this.card = card;
	}


	@Override
	public void run() {
		
		for (int i = 0; i < 10; i++) {
			synchronized(card){
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			card.setMoney(card.getMoney()+1000);
			System.out.println(Thread.currentThread().getName()+"存了1000,還剩"+card.getMoney());
			}
		}
		
	}
}

class GirlFriend implements Runnable{
	
Card card;


public Card getCard() {
	return card;
}


public GirlFriend(Card card) {
	super();
	this.card = card;
}


public void setCard(Card card) {
	this.card = card;
}
@Override
	public void run() {
		for (int i = 0; i < 10; i++) {
			synchronized(card){
			if(card.getMoney()>=1000){
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			card.setMoney(card.getMoney()-1000);
			System.out.println(Thread.currentThread().getName()+"取了1000.,還剩"+card.getMoney());
			}else {
				System.out.println("餘額不足");
			}
			}
		}
		
	}
}