java 类的应用

Posted 2020-09-28

• java 类的应用-模拟银行存取款

public class Card {
    String id = "1451151154121";
    static int yue = 10000;
     public Card()                                                //无参数的构造方法    
    {
    }
    void cunqian(int cunkuan)                                    //存钱方法cunqian,存款数cunkuan
    {
        yue = yue + cunkuan;                                    //余额=余额+存款数
        System.out.println("存入"+cunkuan+"元。");
    }
    void quqian(int qukuan)                                        //取钱方法quqian,取钱数qukuan
    {
        yue = yue - qukuan;                                        //余额=余额-取款数
        System.out.println("取出"+qukuan+"元。");
    }
        public static void main(String arg[]){
            Card xxx  = new Card();                                //*无参数*创建卡xxx,初始值-卡号：1451451154121,余额10000
            int c = 2300,d = 2300;
            xxx.cunqian(c);                                        //取钱
            xxx.quqian(d);                                        //存钱
            int biandong = c - d;
            if(biandong > 0)
            {
                System.out.print("您好，卡号为"+xxx.id+"的用户，您的账户增加"+biandong+"元，余额"+Card.yue+"元");        //输出xxx卡的卡号和余额
            }
            else if(biandong == 0)
            {
                System.out.print("您好，卡号为"+xxx.id+"的用户，您的账户变动"+biandong+"元，余额"+Card.yue+"元");        //输出xxx卡的卡号和余额
            }
            else
            {
                System.out.print("您好，卡号为"+xxx.id+"的用户，您的账户减少"+biandong+"元，余额"+Card.yue+"元");        //输出xxx卡的卡号和余额
            }    
        }
}