java需要写一个JAVA程序，模拟银行账户的查询、转账功能。_CMS教程

“\ T”选项卡，当输出数据显示，几乎以表格形式显示，目的是为了使数据看起来整齐点。

“\ n”换行，其他行显示下一个（），目的是换行字符或字符串，使用Systemoutprintln（）;效果是一样的。

定义Person类作为存储数据的基础

定义一个银行的数据库，模拟初始化银行的客户和资金，并定义一个查询的方法

定义一个类似ATM机，让用户输入并查找

先构建一个客户端，再构建一个服务器端，其实做一个简单的界面，建立一个数据库，调用SQl 语句，，实现单机，模拟多线程的就可以了，服务器部分不做也可以模拟出来。。

PS:这不会是程序专题训练一吧。。。

//您可以使用重入锁实现排队。

package comlw;

import javautilconcurrentlocksLock;

import javautilconcurrentlocksReentrantLock;

public class ReentrantLockDemo implements Runnable {

private int number = 0;// 创建一个变量

private Lock lock = new ReentrantLock();// 创建重入锁对象

@Override

public void run() {

locklock();// 打开锁

try {

for (int i = 0; i < 5; i++) {

try {

Threadsleep(100);// 线程休眠01秒

} catch (InterruptedException e) {

eprintStackTrace();

}

// 输出当前线程的名称和number的值，每次循环之后number的值都会加一

Systemoutprintln(ThreadcurrentThread()getName() + ": "

+ number++);

}

} finally {

lockunlock();// 释放锁

}

public static void main(String[] args) {

ReentrantLockDemo run = new ReentrantLockDemo();// 获得ReentrantLockDemo对象

Thread thread1 = new Thread(run);// 创建线程1

Thread thread2 = new Thread(run);// 创建线程2

thread1start();// 运行线程1

thread2start();// 运行线程2

}

public class Account {

protected String accId;

protected String name;

protected double money;

public Account (String accId,String name){

this(accId,name,0);

}

public Account (String accId,String name,double money){

thisaccId = accId;

thisname = name;

thismoney = money;

}

public void saveMoney(double money){

if(money <= 0){

Systemoutprintln("存款金额必须大于0");

}

thismoney += money;

Systemoutprintln("存款成功");

}

public double getMoney(double money){

if(money <= 0){

Systemoutprintln("取款金额必须大于0");

return 0;

}

if(thismoney <= money){

Systemoutprintln("余额不足，无法取款");

return 0;

}

thismoney -= money;

Systemoutprintln("取款成功");

return money;

}

public double getBalance(){

return thismoney;

}

protected double getOverdraft(){

return 0;

}

// 实现了equals方法，list比较时才能正确

@Override

public boolean equals(Object obj) {

if(obj == null){

return false;

}

if(this == obj){

return true;

}

if(obj instanceof Account){

return thisaccIdequals(((Account)obj)accId);

}

return false;

}

@Override

public String toString() {

return "账户=" + accId + ",名字=" + name + ",余额=" + money;

}

public class Bank {

// Account实现了equals方法，list查找时才能正确

private List<Account> usersAccounts;

public Bank() {

usersAccounts = new ArrayList<Account>();

}

public void addAccount(Account account) {

if (usersAccountscontains(account)) {

Systemoutprintln("添加失败，不能添加同样的账户");

return;

}

usersAccountsadd(account);

}

public boolean delAccount(Account account) {

return usersAccountsremove(account);

}

public boolean delAccount(String accId) {

return delAccount(new Account(accId, null));

}

public boolean existAccount(Account account) {

return usersAccountscontains(account);

}

public boolean existAccount(String accId) {

return existAccount(new Account(accId, null));

}

public Account getAccount(String accId){

return usersAccountsget(usersAccountsindexOf(new Account(accId, null)));

}

public double getAllMoney() {

// 不考虑是否溢出，只是把所有用户余额相加

double result = 0;

for (Account account : usersAccounts) {

result += accountgetBalance();

}

return result;

}

public double getAllOverdraft() {

// 不考虑是否溢出

double result = 0;

for (Account account : usersAccounts) {

result += accountgetOverdraft();

}

return result;

}

public int getAccountNum() {

return usersAccountssize();

}

public int getCreditAccountNum() {

int num = 0;

for (Account account : usersAccounts) {

// instanceof 性能没有简单的方法快。

if (account instanceof CreditAccount) {

num++;

}

return num;

}

public int getSavingAccountNum() {

int num = 0;

for (Account account : usersAccounts) {

if (account instanceof SavingAccount) {

num++;

}

return num;

}

public List<Account> getAllAccount() {

return usersAccounts;

}

public class CreditAccount extends Account{

private double overdraft;

public CreditAccount(String accId,String name){

super(accId, name);

thisoverdraft = 1000;

}

public CreditAccount(String accId,String name,double money){

this(accId, name,money,1000);

}

public CreditAccount(String accId,String name,double money,double overdraft){

super(accId, name,money);

thisoverdraft = overdraft;

}

@Override

public double getMoney(double money) {

if(money <= 0){

Systemoutprintln("取款金额必须大于0");

return 0;

}

if(thismoney + overdraft <= money){

Systemoutprintln("余额不足，无法取款");

return 0;

}

thismoney -= money;

Systemoutprintln("取款成功");

return money;

}

@Override

public double getOverdraft(){

return overdraft;

}

@Override

public String toString() {

return "账户=" + accId + ",名字=" + name + ",余额=" + money + ",透支=" + overdraft;

}

public class SavingAccount extends Account {

public SavingAccount(String accId, String name) {

super(accId, name);

}

public SavingAccount(String accId, String name, double money) {

super(accId, name, money);

}

@Override

public double getMoney(double money) {

return supergetMoney(money);

}

@Override

public double getOverdraft() {

return supergetOverdraft();

}

public class Test {

private static Bank bank = new Bank();

public static void main(String[] args) {

TestgenAccount();

// 开户

Account a1 = new CreditAccount("1", "1", 200, 2000);

Account a2 = new SavingAccount("2", "2", 300);

Account a3 = new SavingAccount("3", "3", 400);

Account a4 = new CreditAccount("4", "4", 500, 2000);

Account a5 = new CreditAccount("4", "5", 600, 2000); // 帐号4重

bankaddAccount(a1);

bankaddAccount(a2);

bankaddAccount(a3);

bankaddAccount(a4);

bankaddAccount(a5);

showNowAccount();

// 销户

bankdelAccount("1");

bankdelAccount("2");

showNowAccount();

// 存款

if(bankexistAccount("3")){

Account acc = bankgetAccount("3");

accsaveMoney(100);

}

showNowAccount();

// 取款

if(bankexistAccount("3")){

Account acc = bankgetAccount("3");