package com.soko.quiz;

public class BankOperation
{
    public static void main(String[] args) throws Exception
    {
        int[] addList = new int[]{100, 300, 800, 500, 400, 200, 600, 700};
        int[] takeList = new int[]{300, 800, 500, 400, 100, 700, 600, 300};
        
        Balance balance = new Balance();
        Thread adder = new Adder(balance, addList);
        Thread taker = new Taker(balance, takeList);
        
        System.out.print("List:");
        adder.start();
        taker.start();
        
        Thread.sleep(500);
        System.out.println("\nBalance:" + balance.getMoney()); //正确答案是 -100
    }
}

class Balance {
    
    private int money = 0;
    boolean isAddOver = false;
    
    public synchronized int getMoney()
    {
        return this.money;
    }
    
    public synchronized void add(int num) throws Exception
    {
        this.notifyAll();
        while((money + num) > 1000)
        {
            this.wait();
        } 
        
        money += num;
        
        System.out.print("add" + num + ", ");
System.out.println("balance:" + money);
    }
    
    public synchronized void take(int num) throws Exception
    {
        this.notifyAll();
        while((money - num) < 100 && !isAddOver)
        {        
            this.wait();
System.out.println("陷入循环无法跳出。 此时的money=" + money + "此时isAddOver=" + isAddOver);        
            
        }
        money -= num;
        
        System.out.print("take" + num + ", ");
System.out.println("balance:" + money);
    }
    
}

class Adder extends Thread {
    
    private Balance balance;
    private int[] addList;
    public Adder(Balance balance, int[] addList)
    {
        this.balance = balance;
        this.addList = addList;
    }
    
    public void run()
    {
        for(int i=0; i<addList.length; i++)
        {
            try
            {
                balance.add(addList[i]);
            }
            catch (Exception e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
    }
    
}

class Taker extends Thread {
    
    private Balance balance;
    private int[] takeList;
    public Taker(Balance balance, int[] takeList)
    {
        this.balance = balance;
        this.takeList = takeList;
    }
    
    public void run()
    {
        for(int i=0; i<takeList.length; i++)
        {
            try
            {
                balance.take(takeList[i]);
            }
            catch (Exception e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
}