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    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);    }}

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