class Account1                             //帳戶緩沖區(qū)
{
    private String name;
    private int value;
    void put(int i)                        //欲存入金額i
    {
        value = value + i;                 //存入時,value值增加
    }
    int get(int i)                         //欲取金額i,返回實際取到金額
    {
        if (value>i)
            value = value - i;             //取走時,value值減少
        else                               //帳戶金額不夠所取時
        {
            i = value;
            value = 0;                     //取走全部所余金額
        }
        return i;                      
    }
    int howmatch()                         //查看帳戶上現(xiàn)有金額
    {
        return value;                      
    }
}
class  Save1 extends Thread                //存款線程
{
    private Account1 a1;
    private int amount;
    public Save1(Account1 a1,int amount)
    {
        this.a1 = a1;
        this.amount = amount;
    }
    public void run()
    {
        int k = a1.howmatch();
        try
        {
            sleep(1);                      //花費時間
        }
        catch(InterruptedException e)
        {
            System.out.println(e);
        }
        a1.put(amount);
        System.out.println("現(xiàn)有"+k+", 存入"+amount+
                                ", 余額"+a1.howmatch());
    }
    public static void main (String args[])
    {
        Account1 a1 = new Account1();
        (new Save1(a1,100)).start();
        (new Save1(a1,200)).start();
        (new Fetch1(a1,500)).start();
    }
}
class Fetch1 extends Thread                //取款線程
{
    private Account1 a1;
    private int amount;
    public Fetch1(Account1 a1,int amount)
    {
        this.a1 = a1 ;
        this.amount = amount;
    }
    public void run()
    {
        int k = a1.howmatch();
        try
        {
            sleep(1);                      //花費時間
        }
        catch(InterruptedException e)
        {
            System.out.println(e);
        }
        System.out.println("現(xiàn)有"+k+", 取走"+a1.get(amount)+
                                     ", 余額"+a1.howmatch());
    }
}