JAVA - ATM机程序

Posted 2020-08-24 唐胜伟

　　　　ATM机程序　　　　　

UnionPayTest.java

package oo.day06.work;

public class UnionPayTest {

}

interface UnionPay{ //银联接口
    public double getBalance(); //查询余额
    public boolean drawMoney(double number); //取款
    public boolean checkPwd(String input); //检查密码
}

interface ABC extends UnionPay{ //农行接口
    /**支付电话费*/
    public boolean payTelBill(String phoneNum,double sum); 
}
interface CCB extends UnionPay {
    /**增加的支付燃气费功能*/
    public void payGasBill(double number);
}



class ABCImpl implements ABC{ //农行卡
    private double money;
    private String pwd;
    
    public ABCImpl(double money,String pwd){
        this.money = money;
        this.pwd = pwd;
    }
    
    @Override
    public double getBalance() {        
        return money;
    }
    @Override
    public boolean drawMoney(double number) {
        if(number <= money){
            money -=number;
            return true;
        }
        return false;
    }
    @Override
    public boolean checkPwd(String input) {
        if(pwd.equals(input))
            return true;
        else
            return false;
    }
    public boolean payTelBill(String phoneNum,double sum){
        if(sum <= money){
            money -=sum;
            return true;
        }
        return false;
    }
}

/**
 * 类：用于描述建设银行实际发行的卡片
 * 该卡片具有的功能来自于继承的已经符合银联规范的CCB接口
 */
class CCBImpl implements CCB {
    private double money;
    private String pwd;
    
    public CCBImpl(double money,String pwd){
        this.money = money;
        this.pwd = pwd;
    }
    
    @Override
    public double getBalance() {        
        return money;
    }
    @Override
    public boolean drawMoney(double number) {
        if(number <= money){
            money -=number;
            return true;
        }
        return false;
    }
    @Override
    public void payGasBill(double number) {
        if(number < money){
            money-=number;
        }
    }
    @Override
    public boolean checkPwd(String input) {
        if(pwd.equals(input))
            return true;
        else
            return false;
    }
}

TestUnionPay.java  (用于测试上面的程序使用)

package oo.day06.work;
import java.util.Scanner;
/**
 * 测试实现接口后的类的方法调用
 */
public class TestUnionPay {
    public static void main(String[] args) {
        //ICBCImpl icbc = new ICBCImpl(2000,"123456");
        //ICBC icbc = new ICBCImpl(2000,"123456");
        //UnionPay icbc = new ICBCImpl(2000,"123456");
        //UnionPay icbc = new ABCImpl(2000,"123456");
        UnionPay ccb = new CCBImpl(2000,"123456");　　　　//这里用了“向上造型”
        Scanner input = new Scanner(System.in);
        System.out.println("请输入密码：");
        if(ccb.checkPwd(input.next())){
            System.out.println("请输入金额：");
            double num = Double.parseDouble(input.next());
            if(ccb.drawMoney(num)){
                System.out.println("取钱成功，卡余额为："+ccb.getBalance());
            }
            else{
                System.out.println("取钱失败");
            }
        }else{
            System.out.println("密码错误");
        }
    }
}

ABCATMTest.java

package oo.day06.work;
import java.util.Scanner;
public class ABCATMTest {
}

/**
 * ABCATM机类，用于描述模拟插入银行卡后的操作
 */
class ABCATM {
    private UnionPay  card;
    
    public void insertCard(UnionPay userCard){
        if (card == null) {
            card = userCard;
        }
    }
    
    private void outCard(){
        card = null;
    }
    
    private void showBalance(){
        System.out.println("当前余额是：" + card.getBalance());
    }
    
    private void takeMoney(){
        Scanner input = new Scanner(System.in);        
        System.out.println("请输入取款数目：");
        double  number = Double.parseDouble(input.next());
        if(card.drawMoney(number)){
            System.out.println("取款成功");
        }else{
            System.out.println("取款失败");
        }
    }
    
    private void payTelBill(){
        Scanner input = new Scanner(System.in);    
        if(card instanceof ABC){
            ABC abcCard = (ABC)card;　　　　　　　　　　//这里用了“向下造型”。
            System.out.println("请输入电话 号码：");
            String telNum = input.next();
            System.out.println("请输入缴费额：");
            double sum = Double.parseDouble(input.next());
            if(abcCard.payTelBill(telNum,sum)){
                System.out.println("缴费成功");
            }else{
                System.out.println("缴费失败");
            }
                
                
        }else{
            System.out.println("您的卡不是农业银行卡，无法完成缴费");
        }
    }
    public void allMenu(){
        Scanner input = new Scanner(System.in);    
        
        System.out.println("请输入密码：");
        String pwd = input.next();
        
        if(card.checkPwd(pwd)){
            System.out.println("请选择功能：\n 1.查看余额   2.取款   3.缴电话费");
            int choice = Integer.parseInt(input.next());
            switch(choice){
                case 1:
                    showBalance();
                    break;
                case 2:
                    takeMoney();
                    break;
                case 3:
                    payTelBill();                    
                    break;
                default:
                    System.out.println("非法输入");
            }
        }else{
            System.out.print("密码错误");
        }
        this.outCard();
    }
}

TestATM.java （用于测试上面的程序使用）

package oo.day06.work;

public class TestATM {
    public static void main(String[] args) {
        ABCATM atm =new ABCATM();
//        ICBCImpl icbc = new ICBCImpl(3000, "123456");//工商银行的卡
        ABCImpl  abc  = new ABCImpl(1000, "123456");//农业银行的卡
//        CCBImpl  abc  = new CCBImpl(1000, "123456");//农业银行的卡
            
            
        
        //atm.insertCard(icbc);
        atm.insertCard(abc);
        atm.allMenu();
    }
}