Account账户类：
package org.mobiletrain;
/**
* 银行账户
* @author apple
*
*/
public class Account {
private String id; //账号
private double balance; //余额
private String password;//密码
/**
* 构造器
* @param id
*/
public Account(String id,String password,double balance){
this.id = id;
this.password = password;
this.balance = balance;
}
/**
* 验证身份是否有效
* @param password 密码
* @return 密码匹配返回true，否则返回false
*/
public boolean isValid(String password){
return this.password.equals(password);
}
/**
* 存钱
* @param money 存款金额
*/
public void deposit(double money){
balance += money;
}
/**
* 取钱
* @param money 取款金额
* @return 取款成功返回true，否则返回false
*/
public boolean withdraw(double money){//取钱
if (money <= balance) {
balance -= money;
return true;
}
return false;
}
/**
* 获取账户ID
* @return 账户ID
*/
public String getId() {
return id;
}
/**
* 获取账户余额
* @return 账户余额
*/
public double getBalance() {
return balance;
}
/**
* 修改密码
* @param password 密码
*/
public void setPassword(String password) {
this.password = password;
}
}
ATM类：
package org.mobiletrain;
/**
* ATM机
* @author apple
*
*/
public class ATM {
private Account currentAccount = null;
//用一个数组模拟银行的数据库系统 预先保存若干个银行账户
private Account[] accountsArray= {
new Account("11223344","123123",1200),
new Account("22334455","123456",3000),
new Account("33445566","666666",5000)
};
/**
* 读卡
* @param account 银行账户
* @return 读卡成功返回true，否则返回false
*/
public boolean readCard(String id){
for (Account account : accountsArray) {
if (account.getId().equals(id)) {
currentAccount = account;
return true;
}
}
return false;
}
/**
* 验证身份
* @param password 密码
* @return 验证通过返回true，否则返回false
*/
public boolean verify(String password){
if (currentAccount != null) {
return currentAccount.isValid(password);
}
return false;
}
/**
* 查询余额
* @return 当前余额
*/
public double showBalance(){
return currentAccount.getBalance();
}
/**
* 存钱
* @param money
*/
public void deposit(int money){
currentAccount.deposit(money);
}
/**
* 取钱
* @param money
* @return
*/
public boolean withdraw(int money){
return currentAccount.withdraw(money);
}
/**
* 修改密码
* @param newPassword 新密码
*/
public void changePassword(String newPassword){
currentAccount.setPassword(newPassword);
}
/**
* 退卡
*/
public void quitCard(){
currentAccount = null;
}
/**
* 转账
* @param otherId 转入账号
* @param money 转账金额
* @return 转账成功返回true，否则返回false
*/
public boolean transfer(String otherId,double money){
for (Account account : accountsArray) {
if (account.getId().equals(otherId)) {
Account otherAccount = account;
if (currentAccount.getBalance() >= money) {
currentAccount.withdraw(money);
otherAccount.deposit(money);
return true;
}
else {
return false;
}
}
}
return false;
}
}
ATM测试类：
package org.mobiletrain.test;
import java.util.Scanner;
import org.mobiletrain.ATM;
public class ATMtest {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
ATM atm = new ATM();
boolean isRunning = true;
while(isRunning){
System.out.println("欢迎使用XX银行ATM机");
System.out.print("请插入银行卡：");
String id = input.next();
atm.readCard(id);
if (atm.readCard(id)) {
int counter = 0;
boolean isCorrect = false;
do{
counter += 1;
System.out.print("请输入密码：");
String password = input.next();
isCorrect = atm.verify(password);
}while(counter < 3 && !isCorrect);
if (isCorrect) {
boolean flag = true;
while(flag){
System.out.println("1.查询余额");
System.out.println("2.存款");
System.out.println("3.取款");
System.out.println("4.转账");
System.out.println("5.修改密码");
System.out.println("6.退卡");
int choice;
do {
System.out.print("请选择:");
choice = input.nextInt();
} while (choice < 1 || choice > 6);
switch (choice) {
case 1:
System.out.println("账户余额:" + atm.showBalance());
break;
case 2:{//一堆花括号就构成了一个作用域(scope)
//在某个作用域中定义的变量只在该作用域中生效
System.out.print("请放入钞票:");
int money = input.nextInt();
atm.deposit(money);
System.out.println("存款成功！");
break;
}
case 3:{
System.out.print("请输入或选择取款金额:");
int money = input.nextInt();
if (atm.withdraw(money)) {
System.out.println("请取走你的钞票");
}
else {
System.out.println("余额不足！");
}
break;
}
case 4:{
System.out.print("请输入转入账号:");
String otherId = input.next();
System.out.print("请输入转账金额:");
double money = input.nextDouble();
if (atm.transfer(otherId, money)) {
System.out.println("转账成功");
}
else {
System.out.println("转账失败，请检查转入账号和账户余额是否正确!");
}
break;
}
case 5:
System.out.print("请输入新密码：");
String newPwd = input.next();
System.out.print("请再输入一次：");
String rePwd = input.next();
if (newPwd.equals(rePwd)) {
atm.changePassword(newPwd);
System.out.println("密码已修改");
}
else {
System.out.println("两次密码输入不一致.");
}
break;
case 6:
System.out.println("请取走你的卡片");
flag = false;
break;
}
}
}
else {
System.out.println("输入密码错误次数超过3次，你的卡被回收");
}
}
}
input.close();
}
}
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