Java如何实现银行账户管理子系统
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所用到的知识点：面向对象基础语法,封装，方法覆盖（重写）、继承、多态
话不多说，直接上代码
Account.java
package com.task1;
import java.util.Scanner;
public class Account {
//规定账户类型：
//0 – 储蓄账户 1 – 信用账户 2 – 可贷款储蓄账户 3– 可贷款信用账户
private Long id ;//账户号码
private String password;//账户密码
private String name;//真实姓名
private String personId;//身份证号码
private String email;//客户的电子邮箱
private double balance;//账户余额
private int type;//账户类型
//无参的构造方法
public Account(){
}
//有参的构造方法
public Account(long id, String password, String name, String personId, String email, double balance, int type) {
super();
this.id = id;
this.password = password;
this.name = name;
this.personId = personId;
this.email = email;
this.balance = balance;
this.type = type;
}
//get、set方法
public Long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPersonId() {
return personId;
}
public void setPersonId(String personId) {
this.personId = personId;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
//存款
public Account deposit(double money ) {
this.balance+= money; //余额增加
return this;
}
//取款
public Account withdraw(double money) {
if(balance - money >= 0) { //判断余额是否足够
balance -= money; //余额减少
// System.out.println("存款成功");
}
else {
System.out.println("您的余额不足！");
}
return this;
}
//重写toString方法
@Override
public String toString() {
return "Account [id=" + id + ", password=" + password + ", name=" + name + ", personId=" + personId + ", email="
+ email + ", balance=" + balance + ", type=" + type + "]";
}
}SavingAccount.java
package com.task1;
public class SavingAccount extends Account {
public SavingAccount() {
super();
// TODO Auto-generated constructor stub
}
public SavingAccount(long id, String password, String name, String personId, String email, double balance,
int type) {
super(id, password, name, personId, email, balance, type);
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "SavingAccount [getId()=" + getId() + ", getPassword()=" + getPassword() + ", getName()=" + getName()
+ ", getPersonId()=" + getPersonId() + ", getEmail()=" + getEmail() + ", getBalance()=" + getBalance()
+ ", getType()=" + getType() + "]";
}
}CreditAccpunt.java
package com.task1;
public class CreditAccount extends Account{
private double ceiling;
public CreditAccount() {
super();
}
public CreditAccount(long id, String password, String name, String personId, String email, double balance,
int type,double ceiling) {
super(id, password, name, personId, email, balance, type);
this.ceiling = ceiling;
}
public double getCeiling() {
return ceiling;
}
public void setCeiling(double ceiling) {
this.ceiling = ceiling;
}
@Override
public String toString() {
return "CreditAccount [getCeiling()=" + getCeiling() + ", getId()=" + getId() + ", getPassword()="
+ getPassword() + ", getName()=" + getName() + ", getPersonId()=" + getPersonId() + ", getEmail()="
+ getEmail() + ", getBalance()=" + getBalance() + ", getType()=" + getType() + "]";
}
@Override
public Account withdraw(double money) {
if(getBalance() >= money) {
setBalance(getBalance() - money);
}else if(getBalance() + getCeiling() >= money) {
setCeiling(getCeiling()-(money-getBalance()));
setBalance(0);
}else {
System.out.println("对不起，您的余额不足");
}
return this;
}
}Bank.java
package com.task1;
import java.util.Scanner;
public class Bank {
int index = 0; //当前用户数量
Account [] accounts = new Account [100];//数据库
Account account = null;
/*
* 用户开户(register)
参数列表: Long 账号, String密码, String确认密码,String 姓名,String身份证号码,String邮箱,int 账户类型；
(Long id, String password, String repassword, String name, String personID, String email, int type)
返回类型：Account
规定账户类型：0 – 储蓄账户 1 – 信用账户 2 – 可贷款储蓄账户 3– 可贷款信用账户
*/
//用户开户
public Account register(Long id, String password, String repassword, String name, String personId, String email, int type) {
if(password.equals(repassword)) { // 判断两次输入密码是否一致
switch (type) { //根据用户类型创建不同账户
case 0:
account = new SavingAccount(id, repassword, name, personId, email, 0, type); //创建储蓄账户
break;
case 1:
account = new CreditAccount(id, repassword, name, personId, email, 0, type,1000); //创建信用账户
}
accounts[index++] = account; //账户信息存到数据库，用户数量+1
}
// else {
// System.out.println("两次输入的密码不一致");
// }
return account;
}
//用户登录
public Account login(Long id, String password) {
int find = searchIdPassword(index, id, password); //当前用户数组下标
if(find >= 0) { //判断账户密码是否正确
// System.out.println("登录成功");
return accounts[find]; //返回当前对象
}
// else {
// System.out.println("用户名密码错误");
// }
return null; //如果账户密码错误返回空
}
//用户存款
public Account deposit(Long id, double money) {
int find = searchId(index, id);当前用户数组下标
if(find >= 0) { //判断账户是否存在
accounts[find].deposit(money); //调用Account类的存款方法
// System.out.println("存款成功");
return accounts[find]; //返回当前对象
// accounts[find].setBalance(accounts[find].getBalance()+money);
}
// else {
// System.out.println("用户不存在");
// }
return null; //如果账户不存在返回空
}
//用户取款
public Account withdraw(Long id, String password, double money) {
int find = searchIdPassword(index, id, password);//当前用户数组下标
if(find >= 0) { //判断账户密码是否正确
accounts[find].withdraw(money); //调用当前对象的取款方法
// System.out.println("取款成功");
return accounts[find]; //返回当前对象
}
return null;
}
//设置透支额度
public Account updateCeiling(Long id, String password, double money) {
int find = searchIdPassword(index, id, password);//获取当前用户数组下标
if((find >= 0) && (accounts[find].getType()) == 1){ //判断账户号码和密码是否正确，账户类型是否为信用账户
((CreditAccount)accounts[find]).setCeiling(((CreditAccount)accounts[find]).getCeiling() + money); //调用set方法设置透支额度
return accounts[find];
}
return null;
}
// 转账功能
// 参数：from转出账户，passwordFrom 转出账号的密码，to转入账户，money转账的金额
public boolean transfer(Long from, String passwordFrom, Long to, double money) {
int find = searchIdPassword(index, from, passwordFrom); //转账账户数组下标
int find2 = searchId(index, to); //收款账户数组下标
if(find >= 0 && find2 >= 0 && accounts[find].getBalance() >= money) { //判断转账账户密码、收款账户是否匹配，判断转账用户余额是否足够
accounts[find].withdraw(money);//转账用户转账操作==取款
accounts[find2].deposit(money);//收款用户 == 存款
return true;
}
return false;
}
//统计银行所有账户余额总数
public double balanceSum() {
double sum = 0; //初始化所有账户余额
for(int i = 0; i < index; i++) { //遍历数组
sum += accounts[i].getBalance();//求和(账户余额)
}
return sum;
}
//统计所有信用账户透支额度总数
public double ceilingSum() {
double sum = 0; //初始化所有透支额度和
for(int i = 0; i < index; i++) { //遍历
if(accounts[i].getType() == 1) { //判断账户类型是否为信用账户
sum += ((CreditAccount)accounts[i]).getCeiling(); //求和
}
}
return sum;
}
//搜索Id与密码返回数组下标位置
public int searchIdPassword(int index, Long id, String password) {
for(int i = 0; i < index; i++) {
if(id.equals(accounts[i].getId()) && password.equals(accounts[i].getPassword())){ //比较账户和密码是否匹配
return i ; //匹配则返回账户数组下标
}
}
return -1; //不匹配则返回-1
}
//搜索Id
public int searchId(int index, Long id) {
for(int i = 0; i < index; i++) {
if(id.equals(accounts[i].getId())){ //比较账户是否匹配
return i ; //匹配则返回账户数组下标
}
}
return -1; //不匹配则返回-1
}
}TestAccount.java
package com.task1;
public class TestAccount {
public static void main(String[] args) {
Account a =new Account(123456L, "123456","张三", "421356", "tt@tt.com", 100.0, 0);
System.out.println(a);
}
}TestBank.java
package com.task1;
import java.util.Scanner;
public class TestBank {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
Bank bank = new Bank();
String action =null;
do {
System.out.println("菜单：");
System.out.println("---[1.开户]---");
System.out.println("---[2.登录]---");
System.out.println("---[3.存款]---");
System.out.println("---[4.取款]---");
System.out.println("---[5.设置透支额度]---");
System.out.println("---[6.转账]---");
System.out.println("请选择服务");
int choice =sc.nextInt();
switch(choice) {
case 1: //开户
System.out.println("请输入账户号码：");
Long id = sc.nextLong();
System.out.println("请输入账户密码：");
String password = sc.next();
System.out.println("请确认账户密码：");
String repassword = sc.next();
System.out.println("请输入真实姓名：");
String name = sc.next();
System.out.println("请输入身份证号：");
String personId = sc.next();
System.out.println("请输入电子邮箱：");
String email = sc.next();
System.out.println("请输入账户类型：0 – 储蓄账户 1 – 信用账户 2 – 可贷款储蓄账户 3– 可贷款信用账户");
int type = sc.nextInt();
Account a1 = bank.register(id, password, repassword, name, personId, email, type);
if(a1 != null) {
System.out.println(a1);
System.out.println("开户成功");
}else {
System.out.println("两次输入密码不一致");
}
break;
case 2: //登录
System.out.println("请输入账户号码：");
id = sc.nextLong();
System.out.println("请输入账户密码：");
password = sc.next();
Account a2 = bank.login(id, password);
if(a2 != null) {
System.out.println(a2);
System.out.println("登录成功");
}else {
System.out.println("账户号码密码错误");
}
break;
case 3: //存款
System.out.println("请输入账户号码：");
id = sc.nextLong();
System.out.println("请输入存款金额：");
double money = sc.nextDouble();
Account a3 = bank.deposit(id, money);
if(a3 != null) {
System.out.println(a3);
System.out.println("存款成功");
}else {
System.out.println("账户不存在");
}
break;
case 4: //取款
System.out.println("请输入账户号码：");
id = sc.nextLong();
System.out.println("请输入账户密码：");
password = sc.next();
System.out.println("请输入取款金额：");
money = sc.nextDouble();
Account a4 = bank.withdraw(id, password, money);
if(a4 != null ) {
System.out.println(a4);
System.out.println("取款成功");
}else {
System.out.println("账户号码密码错误");
}
break;
case 5://设置透支额度
System.out.println("请输入账户号码：");
id = sc.nextLong();
System.out.println("请输入账户密码：");
password = sc.next();
System.out.println("请输入透支金额：");
money = sc.nextDouble();
Account a5 = bank.updateCeiling(id, password, money);
if(a5 != null ) {
System.out.println(a5);
System.out.println("设置透支额度成功");
}else {
System.out.println("账户号码密码错误或账户类型错误");
}
break;
case 6:// 转账功能
System.out.println("请输入转账账户号码：");
Long from = sc.nextLong();
System.out.println("请输入转账账户密码：");
String passwordFrom = sc.next();
System.out.println("请输入收款账户号码：");
Long to = sc.nextLong();
System.out.println("请输入转账金额：");
money = sc.nextDouble();
boolean flag = bank.transfer(from, passwordFrom, to, money);
if(flag) {
System.out.println("转账成功");
}else {
System.out.println("转账失败");
}
break;
default:
System.out.println("服务选择错误");
}
System.out.println("是否继续(y/n)?");
action = sc.next();
}while("y".equals(action));
double balanceSum = bank.balanceSum();
double ceilingSum = bank.ceilingSum();
System.out.println("银行所有账户余额总数:"+balanceSum);
System.out.println("所有信用账户透支额度总数"+ceilingSum);
}
}读到这里，这篇“Java如何实现银行账户管理子系统”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注蜗牛博客行业资讯频道。
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