本文例項為大家分享了java實現銀行管理系統的具體程式碼，供大家參考，具體內容如下

Bank類

package First;

import java.util.TreeSet;

//銀行類
public class Bank {
 private String Bankname = "坑對對銀行";  //銀行名稱
 TreeSet<User> holder = null;    //銀行儲存的資訊
 private static Bank INSTANCE = new Bank();
 private Bank() {}      //私有化銀行類
 public static Bank getInstance() {
 // TODO Auto-generated method stub
 return INSTANCE;
 }
 //存款功能
 public void saveMoney(User user,double money) {
 //初始金額與存入金額相加
 double sum = user.getSum()+money;
 user.setSum(sum);
 System.out.print(money+"存款成功!!!"+",當前餘額是:"+user.getSum());
 System.out.print("\n");
 }
 //取款功能
 public void drawMoney(User user,double money,String pw) {
 if(user.getPw().equals(pw)) {  //先判斷取款密碼
 if(user.getSum()>=money) {  //判斷餘額
 user.setSum(user.getSum()-money);
 System.out.print("取款成功");
 System.out.print("\n");
 System.out.print("當前餘額為:"+"\t"+user.getSum());
 System.out.print("\n");
 }else {
 System.out.print("抱歉餘額不足!!! 當前餘額:"+user.getSum());
 System.out.print("\n");
 }
 }
 }
 //檢視餘額以及資訊
 public void looksum(User user) {
 System.out.print("姓名:"+user.getName()+",賬號:"+user.getAccount()+",餘額:"+user.getSum());
 System.out.print("\n");
 }
 //歡迎語句
 public void welcom(User user) {
 if(user.getSexual().equals("男")) {
 System.out.print(user.getName()+" 先生!!"+" "+(this.Bankname)+" 歡迎您!!!");
 System.out.print("\n");
 }else if(user.getSexual().equals("女")){
 System.out.print(user.getName()+" 女士!!"+" "+(this.Bankname)+" 歡迎您!!!");
 System.out.print("\n");
 }
 }
 //再見語句
 public void GoodBye(User user) {
 if(user.getSexual().equals("男")) {
 System.out.print(user.getName()+" 先生!!"+" "+(this.Bankname)+" 祝您生活愉快!!!");
 System.out.print("\n");
 }else if(user.getSexual().equals("女")){
 System.out.print(user.getName()+" 女士!!"+" "+(this.Bankname)+" 祝您生活愉快!!!");
 System.out.print("\n");
 }
 }
 
}

Data:資料儲存類

package First;

import java.util.TreeSet;
//模擬一個數據庫
//銀行的資料庫
public class Data {
 TreeSet<User> holder = new TreeSet<User>(new MyComparator()); //用於儲存使用者資訊的容器---自定義比較規則
 File file = File.getFile();   //獲取一個檔案類
 private static Data data = new Data();     
 //單例模式--因為儲存資料的類唯一.所以不能隨意被例項化
 private Data() {}    //私有化構造方法
 public static Data getData() {   //提供返回該物件的靜態方法
 return data; 
 }
 //新增使用者
 public void addUser(User user) {
 holder.add(user);
 System.out.print("註冊成功!!");
 System.out.print("\n");
 }
 //刪除使用者
 public void removeUser(User user) {
 if(holder.contains(user)) {   //如果容器中包含所user物件,則移除物件
 holder.remove(user); 
 }else {    //如果不包含則列印語句
 System.out.print("抱歉請檢查輸入的資訊是否正確");
 System.out.print("\n");
 }
 }
 //獲取容器
 public TreeSet<User> getHolder() {
 return holder;
 }
 //寫入容器
 public void setHolder(TreeSet<User> holder) {
 this.holder = holder;
 }
 
}

FIie:檔案IO類

package First;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Iterator;
import java.util.TreeSet;

/*
 * 檔案類--負責向記憶體中初始化資訊以及程式結束後向記憶體中存入資訊
 * */
public class File {
 TreeSet<User> holder = Data.getData().getHolder(); //從Data資料庫中獲取容器
 //檔案類只供使用不能被任意實際化
 public static File FILE;   //私有化一個File類
 private File() {}; 
 public static File getFile() {   //對外界提供獲取方法
 return FILE;
 }
 //儲存到檔案裡
 public static void SaveToFile(TreeSet<User> list) { //將獲取到的容器存入到檔案中----序列化
  ObjectOutputStream oo = null;
  try {
   oo = new ObjectOutputStream(new FileOutputStream(".\\src\\Test\\text1.txt")); //獲取檔案儲存地址
   oo.writeObject(list);    //將容器寫入
  } catch (Exception ex) {
   ex.printStackTrace();
  }finally {
   try {
   oo.close();     //將流關閉
   }catch(IOException e) {
   e.printStackTrace();
   }
  }
 }
 //從檔案裡讀取
 public static TreeSet<User> ReadFromFile() {
 ObjectInputStream ois = null;
 TreeSet<User> list = null;
  try {
   ois = new ObjectInputStream(new FileInputStream(".\\src\\Test\\text1.txt"));//反序列化從檔案中獲取容器載入到記憶體
   list = Data.getData().getHolder();   //獲取容器
   list = (TreeSet<User>) ois.readObject();   //從流中獲取物件
   Iterator it = list.iterator();   //迭代器
   System.out.print("當前使用者資訊:");
   System.out.print("\n"); 
   System.out.print("\n"); 
   while(it.hasNext()) {    //迭代初始資訊
    User user = (User) it.next();
    System.out.print("\t"+"姓名:"+user.getName()+"\t"+"賬號:"+user.getAccount()+"\t"+"密碼:"+user.getPassword()+"\t"+"餘額:"+user.getSum()+"\t");
    System.out.print("\n");
    System.out.print("\n");
   }
   
  } catch (Exception ex) {
   ex.printStackTrace();
  }finally {
   try {
   ois.close();    //將流關閉
   }catch(IOException e){
   e.printStackTrace();
   }
  }
  return list;
 }
}

MyComparator:自定義比較器類

package First;

import java.io.Serializable;
import java.util.Comparator;

//自定義比較器
//想要存入集合必須實現序列化和反序列化
public class MyComparator implements Comparator,Serializable{

 /**
 * 
 */
 private static final long serialVersionUID = 1L;
 @Override
 public int compare(Object arg0,Object arg1) {
 User user1 = (User)arg0;  //重寫比較方法 --- 強轉成User型別
 User user2 = (User)arg1;
 return user1.getAccount().compareTo(user2.getAccount());//比較兩個銀行賬戶
 }

}

Operate：系統核心

package First;

import java.util.Iterator;
import java.util.Scanner;
import java.util.TreeSet;
//後臺作業系統
//後臺管理員
public class Operate {
 Scanner sc = new Scanner(System.in);  //鍵盤錄入
 TreeSet<User> holder = Data.getData().getHolder(); //從Data資料庫中獲取容器
 Bank bank = Bank.getInstance();   //獲取一個銀行類
 File file = File.getFile();   //獲取一個檔案類
 //登入選單
 public void registerMenu(){
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print("\n");
 System.out.print(" 歡迎來到坑多多銀行登入系統!!!\n");
 System.out.print("\n");
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print("\n");
 holder = File.ReadFromFile();  //從檔案中獲取容器
 Data.getData().setHolder(holder);   //把從檔案中獲取容器儲存到資料庫中
 int str=1;    //從鍵盤獲取數字
 while(str!=0) {
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print(" 1: 登入 ");
 System.out.print("\n");
 System.out.print(" 2: 註冊 ");
 System.out.print("\n");
 System.out.print(" 3: 忘記密碼");
 System.out.print("\n");
 System.out.print(" 4: 登出使用者");
 System.out.print("\n");
 System.out.print(" 0: 退出");
 System.out.print("\n");
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print("請輸入:");
 str = sc.nextInt();
 switch(str){   //根據使用者輸入的值進行選擇
 case 1:
  System.out.print("請輸入您的賬號:"); 
  String account = sc.next();  //從鍵盤中獲取錄入使用者名稱
  System.out.print("請輸入您的密碼:"); 
  String pw = sc.next();  //從鍵盤中錄入密碼
  User user = logon(holder,account,pw);
  if(user!=null) {  //判斷是否登入成功
  System.out.print("登入成功!!!!歡迎使用");
  System.out.print("\n");
  System.out.print("正在跳轉到銀行操作介面.........");
  System.out.print("\n");
  this.BankMenu(user);     //如果登入成功則將user物件傳入到銀行操作介面並跳轉
  }else {
  System.out.print("登入失敗!!!請從新輸入"); //如果登入失敗列印此語句
  System.out.print("\n"); 
  }
  break;
 case 2:
  this.logon();   //呼叫註冊方法
  break;
 case 3:
  this.modify();   //呼叫修改方法
  break;
 case 4:
  holder = logout(holder);  //呼叫刪除操作
  break;
 case 0:
  File.SaveToFile(holder);   //退出系統式將資訊儲存到檔案中
  System.out.print("再見!!!!");
  System.out.print("\n");
 default:
  System.out.print("輸入錯誤!!!!");
  System.out.print("\n");
 }
 }
 }
 //登入方法
 public User logon(TreeSet<User> holder,String account,String pw) {
 Iterator<User> it = holder.iterator();    //獲取迭代器
 while(it.hasNext()) {
 User user = it.next();
 if(user.getAccount().equals(account)&&user.getPassword().equals(pw)){
 System.out.print("登入成功!!");
 System.out.print("\n");
 return user;
 }
 }
 System.out.print("賬戶或密碼錯誤  登入失敗!!");
 System.out.print("\n");
 return null;
 }
 //註冊方法體
 public void logon(){
 System.out.print("歡迎來到註冊介面!!!!");
 System.out.print("\n");
 String name;     //使用者名稱
 String account;    //銀行賬號
 String password;    //密碼
 String pw;      //取款密碼
 double sum;      //賬戶金額
 String sexual;     //性別
 User user = new User();   //先建立一個空參的user物件
 
 boolean flag = true;          //語句的開關
 while(flag) {    //將註冊的資訊依次輸入
 switch(1) {
 case 1:
 System.out.print("請輸入姓名:");  //依次從鍵盤中獲取對應的姓名----正則表示式
 name = sc.next();
 user.setName(name);   //將名字寫入物件中
 case 2:    
 System.out.print("請輸入賬號(9位數字):");
 account = sc.next();   //從鍵盤中獲取賬號
 String reges ="[0-9]{9}";   //正則表示式規則對賬號進行限制
 if(!account.matches(reges)) {  //如果不符合要求則報錯
  System.out.print("賬號不符合規範!!");
  System.out.print("\n");
  System.out.print("請重新註冊");
  System.out.print("\n");
  break;
 }
 user.setAccount(account);   //將賬號寫入物件中
 case 3:
 System.out.print("請輸入密碼(6位):");
 password = sc.next();
 reges ="[0-9]{6}";   //正則表示式規則
 if(!password.matches(reges)){  //如果密碼不符合正則規則則報錯
  System.out.print("密碼不符合規範!!");
  System.out.print("\n");
  System.out.print("請重新註冊");
  System.out.print("\n");
  break;
 }
 user.setPassword(password);   //將密碼寫入物件中
 case 4:
 System.out.print("請輸入取款密碼(6位):");
 pw = sc.next();
 reges ="[0-9]{6}";   //正則表示式規則
 if(!pw.matches(reges)) {  
  System.out.print("取款密碼不符合規範!!");
  System.out.print("\n");
  System.out.print("請重新註冊");
  System.out.print("\n");
  break;
 }
 user.setPw(pw);   //將取款密碼寫入到物件中 
 case 5:
 System.out.print("請輸入金額:");
 sum = sc.nextDouble();
 user.setSum(sum);   //將金額寫入到物件中
 case 6:
 System.out.print("請輸入性別:");
 sexual = sc.next();
 user.setSexual(sexual);   //將性別寫入到物件中
 case 7:
 if(!holder.contains(user)){
  Data.getData().addUser(user);  //一切準確無誤後將user存入資料庫Data中
 }
 else {
  System.out.print("使用者存在!!!");
  System.out.print("\n");
     //結束迴圈
 }
 flag = false;
 break;
 }
 }
 }
 //忘記密碼操作
 public void modify() {
 boolean flag = true;
 Iterator<User> it = holder.iterator();    //獲取迭代器
 System.out.print("請輸入賬戶:");
 String account = sc.next();    //從鍵盤中獲取賬戶
 while(it.hasNext()) {
 User user = it.next();  
 if(user.getAccount().equals(account)){   //如果容器中有這個物件則對它進行修改
 System.out.print("請輸入新賬戶的密碼:");
 String pw = sc.next();      //從監盤上錄入新的密碼
 String reges ="[0-9]{6}";    //正則表示式規則
 if(!pw.matches(reges)) {   //如果密碼不符合正則規則則報錯
  System.out.print("密碼不符合規範!!");
  System.out.print("\n");
 }else {     //正則表示式判斷是否符合條件
  holder.remove(user);   //先從原容器中刪除user  
  user.setPassword(pw);   //修改user的屬性
  holder.add(user);       //然後再向容器中新增
  System.out.print("修改成功!!!");
  System.out.print("\n");
  flag = false;
  break;
 }
 }
 }
 if(flag) {
 System.out.print("沒有找到該使用者");
 System.out.print("\n");
 }
 }
 //登出方法
 public TreeSet<User> logout(TreeSet<User> list) {
 String username;      //使用者名稱
 String password;      //密碼
 System.out.print("請輸入使用者賬號:");
 username = sc.next();    //從鍵盤錄入使用者名稱
 System.out.print("請輸入密碼:");
 password = sc.next();    //從鍵盤錄入密碼
 Iterator it = list.iterator();     //獲取迭代器
 while(it.hasNext()) {
 User user = (User)it.next();     //獲取物件
 if(user.getAccount().equals(username)&&user.getPassword().equals(password)){
 list.remove(user);    //如果錄入的資訊匹配則從容器中刪除user物件
 System.out.print("登出成功!!");
 System.out.print("\n");
 return list;
 }
 } 
 System.out.print("賬號或者密碼錯誤");   //不匹配列印提示語句
 System.out.print("\n"); 
 return list; 
 }
 //銀行操作介面
 public void BankMenu(User user) {
 bank.welcom(user);    //銀行呼叫歡迎語句
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print("\n");
 System.out.print(" 歡迎來到坑多多銀行擦作業系統!!!\n");
 System.out.print("\n");
 int str = 1;      
 while(str!=0) {
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print(" 1: 取錢 ");
 System.out.print("\n");
 System.out.print(" 2: 存錢 ");
 System.out.print("\n");
 System.out.print(" 3: 檢視餘額");
 System.out.print("\n");
 System.out.print(" 0: 退出登入");
 System.out.print("\n");
 System.out.print("****************************");
 System.out.print("\n");
 System.out.print("\n");
 System.out.print("請輸入您的選項:");  //從鍵盤中讀取字串
 str = sc.nextInt();
 switch(str){   //根據使用者輸入的值進行選擇
 case 1:    //取錢選項
  System.out.print("請輸入取款密碼:");
  
  String pw = sc.next();    //從鍵盤獲取輸入的密碼
 
  if(user.getPw().equals(pw)) {  //將輸入的取款密碼與使用者的密碼進行比對:如果相同則繼續執行
  System.out.print("請輸入取款金額:");
  double money = sc.nextDouble();  //從鍵盤獲取輸入的金額
  if(money>=0) {   //判斷金額是否有誤
  bank.drawMoney(user,money,pw);   //呼叫取款方法
  }else {
  System.out.print("輸入金額錯誤!!!");
  System.out.print("\n");
  }
  }else {
  System.out.print("輸入密碼有誤!!!");
  System.out.print("\n");
  }
  break;
 case 2:
  System.out.print("請輸入取款金額:");
  System.out.print("\n");
  double money1 = sc.nextDouble(); //從鍵盤獲取輸入的金額
  if(money1>=0) {  //判斷金額是否有誤
  bank.saveMoney(user,money1);;  //呼叫存款方法
  }else {
  System.out.print("輸入金額錯誤!!!");
  System.out.print("\n");
  }
  break;
 case 3:
  bank.looksum(user);      //呼叫銀行---查詢賬戶操作
  break;
 case 0:
  bank.GoodBye(user);   //呼叫結束語句
  break;
 default:
  System.out.print("輸入錯誤");
  System.out.print("\n");
 }
 }
 }
 
}

User類:

package First;

import java.io.Serializable;
 /*
 * 這是一個User類
 * */
public class User implements Serializable{
 /**
 * 實現介面,用於序列化和反序列化
 */
 private static final long serialVersionUID = 1L;
 private String name;  //使用者名稱
 private String account; //銀行賬號
 private String password; //密碼
 private String pw;   //取款密碼
 private double sum;   //賬戶金額
 private String sexual;  //性別
 //獲取使用者名稱
 public String getName() {
 return name;
 }
 //寫入使用者名稱
 public void setName(String name) {
 this.name = name;
 }
 //獲取賬號
 public String getAccount() {
 return account;
 }
 //寫入賬號
 public void setAccount(String account) {
 this.account = account;
 }
 //獲取密碼
 public String getPassword() {
 return password;
 }
 //修改密碼
 public void setPassword(String password) {
 this.password = password;
 }
 //檢視餘額
 public double getSum() {
 return sum;
 }
 //修改餘額
 public void setSum(double sum) {
 this.sum = sum;
 }
 //寫入性別
 public String getSexual() {
 return sexual;
 }
 //修改性別
 public void setSexual(String sexual) {
 this.sexual = sexual;
 }
 //獲取取款密碼
 public String getPw() {
 return pw;
 }
 //寫入取款密碼
 public void setPw(String pw) {
 this.pw = pw;
 }
 //hashCode比較方法
 @Override
 public int hashCode() {
 final int prime = 31;
 int result = 1;
 result = prime * result + ((account == null) ? 0 : account.hashCode());
 result = prime * result + ((name == null) ? 0 : name.hashCode());
 result = prime * result + ((password == null) ? 0 : password.hashCode());
 result = prime * result + ((pw == null) ? 0 : pw.hashCode());
 result = prime * result + ((sexual == null) ? 0 : sexual.hashCode());
 long temp;
 temp = Double.doubleToLongBits(sum);
 result = prime * result + (int) (temp ^ (temp >>> 32));
 return result;
 }
 //equals比較方法
 /*
 * 知識點:
 * public boolean equals(Object obj)名稱不可改變
 * */
 @Override
 public boolean equals(Object obj) {
 if (this == obj)
 return true;
 if (obj == null)
 return false;
 if (getClass() != obj.getClass())
 return false;
 User other = (User) obj;
 if (account == null) {
 if (other.account != null)
 return false;
 } else if (!account.equals(other.account))
 return false;
 if (name == null) {
 if (other.name != null)
 return false;
 } else if (!name.equals(other.name))
 return false;
 if (password == null) {
 if (other.password != null)
 return false;
 } else if (!password.equals(other.password))
 return false;
 if (pw == null) {
 if (other.pw != null)
 return false;
 } else if (!pw.equals(other.pw))
 return false;
 if (sexual == null) {
 if (other.sexual != null)
 return false;
 } else if (!sexual.equals(other.sexual))
 return false;
 if (Double.doubleToLongBits(sum) != Double.doubleToLongBits(other.sum))
 return false;
 return true;
 }
 //初始化使用者
 User(String name,String password,String pw,double sum,String sexual){
 this.name = name;
 this.account = account;
 this.password = password;
 this.sum = sum;
 this.sexual = sexual;
 this.pw = pw;
 }
 //空參建構函式
 User(){
 
 }
}

Main()類

package First;

public class Test {
 //測試類----唯一的主函式
 public static void main(String[] args) {
 Operate operate = new Operate();
 operate.registerMenu(); //呼叫登入方法
 }

}

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