Java银行账户管理子系统

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@Overridepublic 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}@Overridepublic 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;}@Overridepublic String toString() {return "CreditAccount [getCeiling()=" + getCeiling() + ", getId()=" + getId() + ", getPassword()="+ getPassword() + ", getName()=" + getName() + ", getPersonId()=" + getPersonId() + ", getEmail()="+ getEmail() + ", getBalance()=" + getBalance() + ", getType()=" + getType() + "]";}@Overridepublic 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Idpublic 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);}}

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Java银行账户管理子系统

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

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