Java学习1209
2016-12-09 本文已影响0人
a04b20daaf33
面向对象入门
- ATM机
- 先创建一个银行账户的类
package com.baidu;
/**
* 银行账户
* @author Yizw
*
*/
public class Account {
private String id;
private double balance;
private String password;
/**
* 构造器
* @param id 银行账户
* @param password 初始密码
* @param balance 初始余额
*/
public Account(String id,String password,double balance){
this.id = id;
this.password = password;
this.balance = balance;
}
/**
* 验证身份
* @param password 输入的密码
* @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 存入金额
*/
public void deposit(double money){
balance += money;
}
/**
* 取钱
* @param money 取出金额
* @return 能否成功取款
*/
public boolean withdraw(double money){
if(money <= balance){
balance -= money;
return true;
}
return false;
}
/**
* 获取银行账户
* @return 账户
*/
public String getId() {
return id;
}
/**
* 获取账户余额
* @return 账户余额
*/
public double getBalance() {
return balance;
}
/**
* 设置密码
* @param password 密码
*/
public void setPassword(String password) {
this.password = password;
}
}
- ATM类
package com.baidu;
/**
* 自动取款机
* @author Yizw
*
*/
public class ATM {
private Account currentAccount;
private Account[] accountsArray={
new Account("1122334455","123456",10000),
new Account("2233445566","123456",1000),
new Account("3344556677","123456",100000)
};
/**
* 读卡
* @param id 银行账户id
* @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;
}
/**
* 验证密码
* @param password 正确密码
* @return 密码匹配返回true 否则返回false
*/
public boolean verfify(String password){
if(currentAccount != null){
return currentAccount.isValid(password);
}
return false;
}
/**
* 显示余额
* @return 余额
*/
public double showBalance(){
return currentAccount.getBalance();
}
/**
* 存钱
* @param money 金额
*/
public void deposit(int money){
currentAccount.deposit(money);
}
/**
* 取钱
* @param money 金额
* @return 取钱成功返回true否则返回false
*/
public boolean withdraw(int money){
return currentAccount.withdraw(money);
}
/**
* 设置密码
* @param newPassword 新密码
*/
public void changePassword(String newPassword){
currentAccount.setPassword(newPassword);
}
/**
* 退卡
*/
public void quitCard(){
currentAccount = null;
}
/**
* 转账
* @param otherId 另一个账户
* @param money 转账金额
*/
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实体
package com.baid.test;
import java.util.Scanner;
import com.baidu.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("欢迎光临");
System.out.println("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.verfify(password);
}while(counter < 3 && !isCorrect);
if(isCorrect){
boolean flag = true;
while(flag){
System.out.println("1.查询余额");
System.out.println("2.存钱");
System.out.println("3.取钱");
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.println("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:{
// 一对花括号就构成了一个作用域（space）
// 在某个作用域中定义的变量只在该作用域生效
System.out.println("请放入钞票:");
int money = input.nextInt();
atm.deposit(money);
System.out.println("存款成功！");
break;
}
case 3:{
System.out.println("请输入或选择取款金额: ");
int money = input.nextInt();
if(atm.withdraw(money)){
System.out.println("取款成功！");
}
else{
System.out.println("余额不足！");
}
break;
}
case 4:{
System.out.println("请输入转入账号: ");
String otherId = input.next();
System.out.println("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.println("请输入新密码 : ");
String newPwd = input.next();
System.out.println("请再输入一次 : ");
String rePwd = input.next();
if(newPwd.equals(rePwd)){
atm.changePassword(newPwd);
System.out.println("密码修改成功！");
}
else{
System.out.println("两次密码不一致。");
}
break;
case 6:
System.out.println("请取走您的卡片");
flag = false;
break;
}
}
}
else{
System.out.println("密码错误3次，你的卡被吞了");
}
}
}
input.close();
}
}
