Java如何實現銀行賬戶管理子系統

本文小編為大家詳細介紹“Java如何實現銀行賬戶管理子系統”，內容詳細，步驟清晰，細節處理妥當，希望這篇“Java如何實現銀行賬戶管理子系統”文章能幫助大家解決疑惑，下面跟著小編的思路慢慢深入，一起來學習新知識吧。

所用到的知識點：面向對象基礎語法,封裝，方法覆蓋（重寫）、繼承、多態

話不多說，直接上代碼

Account.java

package com.task1;

import java.util.Scanner;

public class Account {
    //規定賬戶類型：
    //0 – 儲蓄賬戶  1 – 信用賬戶 2 – 可貸款儲蓄賬戶 3– 可貸款信用賬戶
    private Long id ;//賬戶號碼
    private String password;//賬戶密碼
    private String name;//真實姓名
    private String personId;//身份證號碼
    private String email;//客戶的電子郵箱
    private double balance;//賬戶余額
    private int type;//賬戶類型
    
    //無參的構造方法
    public Account(){
        
    }
    
    //有參的構造方法
    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;   //余額增加
        return this;
    }
    
    //取款
    public Account withdraw(double money) {
        if(balance - money >= 0) { //判斷余額是否足夠
            balance -= money;  //余額減少
//            System.out.println("存款成功");
        }
        else {
            System.out.println("您的余額不足！");
        }
        return this;
    }

    //重寫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("對不起，您的余額不足");
        }
        return this;
    }  

    
}

Bank.java

package com.task1;

import java.util.Scanner;

public class Bank {
    int index = 0; //當前用戶數量
    Account [] accounts = new Account [100];//數據庫
    Account account = null;
    /*
     * 用戶開戶(register)
      參數列表: Long 賬號, String密碼, String確認密碼,String 姓名,String身份證號碼,String郵箱,int 賬戶類型；

(Long id, String password, String repassword, String name, String personID, String email, int type)

      返回類型：Account

      規定賬戶類型：0 – 儲蓄賬戶  1 – 信用賬戶 2 – 可貸款儲蓄賬戶 3– 可貸款信用賬戶
     */
    //用戶開戶
    public Account register(Long id, String password, String repassword, String name, String personId, String email, int type) {

        if(password.equals(repassword)) {  // 判斷兩次輸入密碼是否一致
            switch (type) {          //根據用戶類型創建不同賬戶
            case 0: 
                account = new SavingAccount(id, repassword, name, personId, email, 0, type);   //創建儲蓄賬戶
                
                break;
            case 1:
                account = new CreditAccount(id, repassword, name, personId, email, 0, type,1000);   //創建信用賬戶
            }
            accounts[index++] = account;    //賬戶信息存到數據庫，用戶數量+1
        }
//        else {
//            System.out.println("兩次輸入的密碼不一致");
//        }
        return account;
    }
    
    //用戶登錄
    public Account login(Long id, String password) {
        int find = searchIdPassword(index, id, password); //當前用戶數組下標
        if(find >= 0) {                        //判斷賬戶密碼是否正確
//            System.out.println("登錄成功");
            return accounts[find];         //返回當前對象
        }
//        else {
//            System.out.println("用戶名密碼錯誤");
//        }
        
        return null;   //如果賬戶密碼錯誤返回空
    }
    
    //用戶存款
    public Account deposit(Long id, double money) {
        int find = searchId(index, id);當前用戶數組下標
        if(find >= 0) {                            //判斷賬戶是否存在
            accounts[find].deposit(money);      //調用Account類的存款方法
//            System.out.println("存款成功");
            return accounts[find];             //返回當前對象
//            accounts[find].setBalance(accounts[find].getBalance()+money);
        }
//        else {
//            System.out.println("用戶不存在");
//        }
        

        return null;   //如果賬戶不存在返回空
    }
    
    //用戶取款
    public Account withdraw(Long id, String password, double money) {
        int find = searchIdPassword(index, id, password);//當前用戶數組下標
        if(find >= 0) {         //判斷賬戶密碼是否正確
            
            accounts[find].withdraw(money);     //調用當前對象的取款方法    
//            System.out.println("取款成功");
            return accounts[find];    //返回當前對象

        }
        return null;
    }
    //設置透支額度
    public Account updateCeiling(Long id, String password, double money) {
        int find = searchIdPassword(index, id, password);//獲取當前用戶數組下標
        if((find >= 0) && (accounts[find].getType()) == 1){  //判斷賬戶號碼和密碼是否正確，賬戶類型是否為信用賬戶
            ((CreditAccount)accounts[find]).setCeiling(((CreditAccount)accounts[find]).getCeiling() + money); //調用set方法設置透支額度
            return accounts[find];
        }
        return null;
    }
    
    
    //  轉賬功能
    //  參數：from轉出賬戶，passwordFrom 轉出賬號的密碼，to轉入賬戶，money轉賬的金額
    public boolean transfer(Long from, String passwordFrom, Long to, double money) {
        int find = searchIdPassword(index, from, passwordFrom); //轉賬賬戶數組下標
        int find2 = searchId(index, to);              //收款賬戶數組下標
        if(find >= 0 && find2 >= 0 && accounts[find].getBalance() >= money) {  //判斷轉賬賬戶密碼、收款賬戶是否匹配，判斷轉賬用戶余額是否足夠
                accounts[find].withdraw(money);//轉賬用戶轉賬操作==取款
                accounts[find2].deposit(money);//收款用戶 == 存款
                return true;

        } 

        return false;
    }
    
    //統計銀行所有賬戶余額總數
    public double balanceSum() {
        double sum = 0;     //初始化所有賬戶余額
        for(int i = 0; i < index; i++) {  //遍歷數組
            sum += accounts[i].getBalance();//求和(賬戶余額)
        }
        return sum;
    }
    
    //統計所有信用賬戶透支額度總數
    public double ceilingSum() {
        double sum = 0;  //初始化所有透支額度和
        for(int i = 0; i < index; i++) {  //遍歷
            if(accounts[i].getType() == 1) {  //判斷賬戶類型是否為信用賬戶
                sum += ((CreditAccount)accounts[i]).getCeiling(); //求和
            }
        }
        return sum;
    }
    //搜索Id與密碼返回數組下標位置
    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())){  //比較賬戶和密碼是否匹配
                return i ;   //匹配則返回賬戶數組下標
            }
            
        }
        return -1;     //不匹配則返回-1
    }
    //搜索Id
    public int searchId(int index, Long id) {
        for(int i = 0; i < index; i++) {
            if(id.equals(accounts[i].getId())){   //比較賬戶是否匹配
                return i ;                        //匹配則返回賬戶數組下標
            }
            
        }
        return -1;    //不匹配則返回-1
    }
}

TestAccount.java

package com.task1;

public class TestAccount {

    public static void main(String[] args) {

        Account a =new Account(123456L, "123456","張三", "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("菜單：");
            System.out.println("---[1.開戶]---");
            System.out.println("---[2.登錄]---");
            System.out.println("---[3.存款]---");
            System.out.println("---[4.取款]---");
            System.out.println("---[5.設置透支額度]---");
            System.out.println("---[6.轉賬]---");
            System.out.println("請選擇服務");
            int choice =sc.nextInt();
            
            switch(choice) {
            
                case 1:            //開戶

                    System.out.println("請輸入賬戶號碼：");
                    Long id = sc.nextLong();
                    System.out.println("請輸入賬戶密碼：");
                    String password = sc.next();
                    System.out.println("請確認賬戶密碼：");
                    String repassword = sc.next();
                    System.out.println("請輸入真實姓名：");
                    String name = sc.next();
                    System.out.println("請輸入身份證號：");
                    String personId = sc.next();
                    System.out.println("請輸入電子郵箱：");
                    String email = sc.next();
                    System.out.println("請輸入賬戶類型：0 – 儲蓄賬戶  1 – 信用賬戶 2 – 可貸款儲蓄賬戶 3– 可貸款信用賬戶");
                    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("開戶成功");
                    }else {
                        System.out.println("兩次輸入密碼不一致");
                    }
                    
                    break;
                case 2:            //登錄
                    System.out.println("請輸入賬戶號碼：");
                    id = sc.nextLong();
                    System.out.println("請輸入賬戶密碼：");
                    password = sc.next();
                    Account a2 = bank.login(id, password);
                    if(a2 != null) {
                        System.out.println(a2);
                        System.out.println("登錄成功");
                    }else {
                        System.out.println("賬戶號碼密碼錯誤");
                    }
                    
                    break;
                    
                case 3:            //存款
                    
                    System.out.println("請輸入賬戶號碼：");
                    id = sc.nextLong();
                    System.out.println("請輸入存款金額：");
                    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("賬戶不存在");
                    }
                    break;
                    
                case 4:            //取款
                    System.out.println("請輸入賬戶號碼：");
                    id = sc.nextLong();
                    System.out.println("請輸入賬戶密碼：");
                    password = sc.next();
                    System.out.println("請輸入取款金額：");
                    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("賬戶號碼密碼錯誤");
                    }
                    
                    break;
                    
                case 5://設置透支額度
                    System.out.println("請輸入賬戶號碼：");
                    id = sc.nextLong();
                    System.out.println("請輸入賬戶密碼：");
                    password = sc.next();
                    System.out.println("請輸入透支金額：");
                    money = sc.nextDouble();
                    Account a5 = bank.updateCeiling(id, password, money);
                    if(a5 != null ) {
                        System.out.println(a5);
                        System.out.println("設置透支額度成功");
                    }else {
                        System.out.println("賬戶號碼密碼錯誤或賬戶類型錯誤");
                    }
                    
                    break;
                    
                case 6://  轉賬功能
                    System.out.println("請輸入轉賬賬戶號碼：");
                    Long from = sc.nextLong();
                    System.out.println("請輸入轉賬賬戶密碼：");
                    String passwordFrom = sc.next();
                    System.out.println("請輸入收款賬戶號碼：");
                    Long to = sc.nextLong();
                    System.out.println("請輸入轉賬金額：");
                    money = sc.nextDouble();
                    boolean flag = bank.transfer(from, passwordFrom, to, money);
                    if(flag) {
                        System.out.println("轉賬成功");
                    }else {
                        System.out.println("轉賬失敗");
                    }
                    
                    break;
                default:
                    System.out.println("服務選擇錯誤");
            }
            System.out.println("是否繼續(y/n)?");
            action = sc.next();
        
        }while("y".equals(action));
        
        double balanceSum = bank.balanceSum();
        double ceilingSum = bank.ceilingSum();
        System.out.println("銀行所有賬戶余額總數:"+balanceSum);
        System.out.println("所有信用賬戶透支額度總數"+ceilingSum);
    }

}

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