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JAVA银行案例源代码 银行java程序
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求：用JAVA语言编写的银行家算法的源代码
import java.util.*;
class ThreadTest {
static int type = 4, num = 10; //定义资源数目和线程数目
static int[] resource = new int[type]; //系统资源总数
//static int[] copyResource = new int[type]; //副本
static Random rand = new Random();
static Bank[] bank = new Bank[num]; //线程组
Bank temp = new Bank();
public void init() {
//初始化组中每个线程，随机填充系统资源总数
for(int i = 0; i type; i++)
resource[i] = rand.nextInt(10) + 80;
System.out.print("Resource:");
for(int i = 0; i type; i++)
System.out.print(" " + resource[i]);
System.out.println("");
for(int i = 0; i bank.length; i++)
bank[i] = new Bank("#" + i);
}
public ThreadTest4() {
init();
}
class Bank extends Thread {
//银行家算法避免死锁
public int[]
max = new int[type], //总共需求量
need = new int[type], //尚需资源量
allocation = new int[type]; //已分配量
private int[]
request = new int[type], //申请资源量
copyResource = new int[type]; //资源副本
private boolean isFinish = false; //线程是否完成
int[][] table = new int[bank.length][type*4]; //二维资源分配表
private void init() {
// 随机填充总共、尚需、已分配量
synchronized(resource) {
for(int i = 0; i type; i++) {
max[i] = rand.nextInt(5) + 10;
need[i] = rand.nextInt(10);
allocation[i] = max[i] - need[i];
resource[i] -= allocation[i]; //从系统资源中减去已分配的
}
printer();
for(int i = 0; i type; i++) {
if(resource[i] 0) {
//若出现已分配量超出系统资源总数的错误则退出
System.out.println("The summation of Threads' allocations is out of range!");
System.exit(1);
}
}
}
}
public Bank(String s) {
setName(s);
init();
start();
}
public Bank() {
//none
}
public void run() {
try {
sleep(rand.nextInt(2000));
}
catch(InterruptedException e) {
throw new RuntimeException(e);
}
while(true) {
//程序没有完成时一直不断申请资源
if(askFor() == false) {
try {
sleep(1000);
}
catch(InterruptedException e) {
throw new RuntimeException(e);
}
}
else
tryRequest();
if(noNeed() == true)
break;
}
//休眠一段时间模拟程序运行
try {
sleep(1000);
}
catch(InterruptedException e) {
throw new RuntimeException(e);
}
System.out.println(getName() + " finish!");
synchronized(resource) {
//运行结束释放占有资源
for(int i = 0; i type; i++) {
resource[i] += allocation[i];
need[i] = allocation[i] = max[i] = 0;
}
}
}
private void printer() {
//打印当前资源信息
System.out.print(getName() + " Max:");
for(int i = 0; i type; i++)
System.out.print(" " + max[i]);
System.out.print(" Allocation:");
for(int i = 0; i type; i++)
System.out.print(" " + allocation[i]);
System.out.print(" Need:");
for(int i = 0; i type; i++)
System.out.print(" " + need[i]);
System.out.print(" Available:");
for(int i = 0; i type; i++)
System.out.print(" " + resource[i]);
System.out.println("");
}
private boolean askFor() {
//随机产生申请资源量并检测是否超标
boolean canAsk = false;
for(int i = 0; i type; i++) {
request[i] = rand.nextInt(20);
//防止申请量超过所需量
if(request[i] need[i])
request[i] = need[i];
}
for(int i = 0; i type; i++) //防止随机申请资源全为0
if(request[i] 0)
canAsk = true;
synchronized(resource) {
//锁住可供资源检查是否超标
for(int i = 0; i type; i++) {
if(request[i] resource[i])
//如果申请资源超过可供资源则等待一段时间后重新申请
return false;
}
}
return canAsk;
}
private void tryRequest() {
//创建副本尝试分配请求
synchronized(resource) {
for(int i = 0; i type; i++)
//依然要防止请求量超出范围
if(request[i] resource[i])
return;
for(int i = 0; i type; i++) {
//复制资源量并减去需求量到一个副本上
copyResource[i] = resource[i];
copyResource[i] -= request[i];
}
System.out.print(getName() + " ask for:");
for(int i = 0; i type; i++)
System.out.print(" " + request[i]);
System.out.println("");
if(checkSafe() == true) {
//如果检查安全则将副本值赋给资源量并修改占有量和需求量
for(int i = 0; i type; i++) {
resource[i] = copyResource[i];
allocation[i] += request[i];
need[i] -= request[i];
}
System.out.println(getName() + " request succeed!");
}
else
System.out.println(getName() + " request fail!");
}
}
private boolean checkSafe() {
//银行家算法检查安全性
synchronized(bank) {
//将线程资源信息放入二维资源分配表检查安全性，0~type可用资源／type~type*2所需资源／type*2~type*3占有资源／type*3~-1可用+占用资源
for(int i = 0; i bank.length; i++) {
for(int j = type; j type*2; j++) {
table[i][j] = bank[i].need[j%type];
}
for(int j = type*2; j type*3; j++) {
table[i][j] = bank[i].allocation[j%type];
}
}
//冒泡排序按需求资源从小到大排
for(int i = 0; i bank.length; i++) {
for(int j = i; j bank.length-1; j++) {
sort(j, 4);
}
}
//进行此时刻的安全性检查
for(int i = 0; i type; i++) {
table[0][i] = copyResource[i];
table[0][i+type*3] = table[0][i] + table[0][i+type*2];
if(table[0][i+type*3] table[1][i+type])
return false;
}
for(int j = 1; j bank.length-1; j++) {
for(int k = 0; k type; k++) {
table[j][k] = table[j-1][k+type*3];
table[j][k+type*3] = table[j][k] + table[j][k+type*2];
if(table[j][k+type*3] table[j+1][k+type])
return false;
}
}
}
return true;
}
private void sort(int j, int k) {
//递归冒泡排序
int tempNum;
if(table[j][k] table[j+1][k]) {
for(int i = type; i type*2; i++) {
tempNum = table[j][i];
table[j][i] = table[j+1][i];
table[j+1][i] = tempNum;
}
/*temp = bank[j];
bank[j] = bank[j+1];
bank[j+1] = temp;*/
}
else if(table[j][k] == table[j+1][k] k type*2) //此资源量相同时递归下一个资源量排序并且防止超出范围
sort(j, k+1);
}
private boolean noNeed() {
//是否还需要资源
boolean finish = true;
for(int i = 0; i type; i++) {
if(need[i] != 0) {
finish = false;
break;
}
}
return finish;
}
}
public static void main(String[] args) {
ThreadTest t = new ThreadTest();
//后台线程，设定程序运行多长时间后自动结束
new Timeout(30000, "---Stop!!!---");
}
}
相关问答
Q1: java新手,求完整的源代码
//都是从新手过来JAVA银行案例源代码的JAVA银行案例源代码，以下代码供参考
//1.
public class BankAccount {
private static String acctnum;
private static double money;
private static void showAcct() {
System.out.println("账号为: " + acctnum);
}
private static void showMoney() {
System.out.println("余额为: " + money);
}
public BankAccount(String acc, double m) {
this.acctnum = acc;
this.money = m;
}
public static void main(String[] args) {
BankAccount ba = new BankAccount("626600018888", 5000.00);
ba.showAcct();
ba.showMoney();
}
}
//2.
public class Triangle {
private static float a;
private static float b;
private static float c;
public Triangle(float a, float b, float c) {
this.a = a;
this.b = b;
this.c = c;
}
public static boolean judgeTriangle(float a, float b, float c) {
if ((a Math.abs(b - c) a b + c)
(b Math.abs(a - c) b a + c)
(c Math.abs(a - b) c a + b))
return true;
else
return false;
}
public float getCircumference() {
return this.a + this.b + this.c;
}
}
//3.
public class TestTriangle {
public static void main(String[] args) {
Triangle t = new Triangle(5.3f,7.8f,9.3f);
if(t.judgeTriangle(5.3f,7.8f,9.3f)){
System.out.print("能够成三角形JAVA银行案例源代码，周长为: ");
System.out.printf("%9.2f",t.getCircumference());}
else
System.out.println("不能构成三角形");
}
}
Q2: 用java来编写一个银行类账户和信用卡类的账户，信用卡类账户继承银行账户，求源码
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){
this.accId = accId;
this.name = name;
this.money = money;
}
public void saveMoney(double money){
if(money = 0){
System.out.println("存款金额必须大于0");
}
this.money += money;
System.out.println("存款成功");
}
public double getMoney(double money){
if(money = 0){
System.out.println("取款金额必须大于0");
return 0;
}
if(this.money = money){
System.out.println("余额不足JAVA银行案例源代码，无法取款");
return 0;
}
this.money -= money;
System.out.println("取款成功");
return money;
}
public double getBalance(){
return this.money;
}
protected double getOverdraft(){
return 0;
}
// 实现JAVA银行案例源代码了equals方法JAVA银行案例源代码，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 this.accId.equals(((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 ListAccount usersAccounts;
public Bank() {
usersAccounts = new ArrayListAccount();
}
public void addAccount(Account account) {
if (usersAccounts.contains(account)) {
System.out.println("添加失败，不能添加同样的账户");
return;
}
usersAccounts.add(account);
}
public boolean delAccount(Account account) {
return usersAccounts.remove(account);
}
public boolean delAccount(String accId) {
return delAccount(new Account(accId, null));
}
public boolean existAccount(Account account) {
return usersAccounts.contains(account);
}
public boolean existAccount(String accId) {
return existAccount(new Account(accId, null));
}
public Account getAccount(String accId){
return usersAccounts.get(usersAccounts.indexOf(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 += account.getBalance();
}
return result;
}
public double getAllOverdraft() {
// 不考虑是否溢出
double result = 0;
for (Account account : usersAccounts) {
result += account.getOverdraft();
}
return result;
}
public int getAccountNum() {
return usersAccounts.size();
}
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 ListAccount getAllAccount() {
return usersAccounts;
}
}
public class CreditAccount extends Account{
private double overdraft;
public CreditAccount(String accId,String name){
super(accId, name);
this.overdraft = 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);
this.overdraft = overdraft;
}
@Override
public double getMoney(double money) {
if(money = 0){
System.out.println("取款金额必须大于0");
return 0;
}
if(this.money + overdraft = money){
System.out.println("余额不足，无法取款");
return 0;
}
this.money -= money;
System.out.println("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 super.getMoney(money);
}
@Override
public double getOverdraft() {
return super.getOverdraft();
}
}
public class Test {
private static Bank bank = new Bank();
public static void main(String[] args) {
Test.genAccount();
// 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
bank.addAccount(a1);
bank.addAccount(a2);
bank.addAccount(a3);
bank.addAccount(a4);
bank.addAccount(a5);
showNowAccount();
// 销户
bank.delAccount("1");
bank.delAccount("2");
showNowAccount();
// 存款
if(bank.existAccount("3")){
Account acc = bank.getAccount("3");
acc.saveMoney(100);
}
showNowAccount();
// 取款
if(bank.existAccount("3")){
Account acc = bank.getAccount("3");
System.out.println("余额=" + acc.getBalance());
acc.getMoney(100);
System.out.println("余额=" + acc.getBalance());
acc.getMoney(1000);
System.out.println("余额=" + acc.getBalance());
}
if(bank.existAccount("4")){
Account acc = bank.getAccount("4");
System.out.println("余额=" + acc.getBalance());
acc.getMoney(100);
System.out.println("余额=" + acc.getBalance());
acc.getMoney(1000);
System.out.println("余额=" + acc.getBalance());
acc.getMoney(10000);
System.out.println("余额=" + acc.getBalance());
}
System.out.println(bank.getAccountNum());
System.out.println(bank.getAllMoney());
System.out.println(bank.getAllOverdraft());
System.out.println(bank.getCreditAccountNum());
System.out.println(bank.getSavingAccountNum());
}
public static void genAccount(){
String s = "1000 0000 0000 000";
Account a = null;
for(int i = 1; i 11; i ++){
if((i 2) == 0){
a = new CreditAccount(s + String.valueOf(i), "账户" + String.valueOf(i));
} else {
a = new SavingAccount(s + String.valueOf(i), "账户" + String.valueOf(i));
}
bank.addAccount(a);
}
}
public static void showNowAccount(){
for(Account account : bank.getAllAccount()){
System.out.println(account);
}
}
}
Q3: 用java编写的ATM机源代码
/** * @author admin * 该程序的功能为实现模拟银行ATM自动取款机提款,查询等功能. */ import Java.io.*; /*该类为实现客户信息及部分功能*/ class Account { private String code =null; //信用卡号 private String name =null; //客户姓名 private String password=null; //客户密码 private double money =0.0; //卡里金额 public Account(String code,String name,String password,double money) { this.code=code; this.name=name; this.password=password; this.money=money; } protected String get_Code() { return code; } protected String get_Name() { return name; } protected String get_Password() { return password; } public double get_Money() { return money; } /*得到剩余的钱的数目*/ protected void set_Balance(double mon) { money -= mon; } } /**********实现具体取款机功能*********/ class ATM { Account act; // private String name; // private String pwd; public ATM() { act=new Account("000000","Devil","123456",50000); } /***********欢迎界面***********/ protected void Welcome() { String str="---------------------------------"; System.out.print(str "\n" "欢迎使用Angel模拟自动取款机程序.\n" str "\n"); System.out.print(" 1.取款." "\n" " 2.查询信息." "\n" " 3.密码设置." "\n" " 4.退出系统." "\n"); } /**********登陆系统**********/ protected void Load_Sys() throws Exception { String card,pwd; int counter=0; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); do { System.out.println("请输入您的信用卡号:"); card=br.readLine(); System.out.println("请输入您的密码:"); pwd=br.readLine(); if(!isRight(card,pwd)) { System.out.println("您的卡号或密码输入有误."); counter ; } else SysOpter(); }while(counter3); Lock_Sys(); } 回复获取全部
Q4: JAVA 简单银行系统的代码
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class AccountDemo {
public static double MONEY = 0;// 初始化金额是100元。
public static void main(String[] args) {
final String USER_NAME = "zhangsan";// 用户名
final String PASSWORD = "123456";// 密码
while (true) {
System.out.print("请输入用户名：");
String user_name = getString();
System.out.print("请输入密码：");
String password = getString();
if (user_name != null user_name.equals(USER_NAME)
password != null password.equals(PASSWORD)) {
System.out.println("登陆成功！你要干什么？");
while (true) {
System.out.println("1：存款");
System.out.println("2：取款");
System.out.println("3：查询余额");
System.out.println("q：退出程序");
System.out.print("请选择：");
String userIn = getString();
int in = 0;
if (userIn != null userIn.equals("1")) {
in = Integer.parseInt(userIn);
} else if (userIn != null userIn.equals("2")) {
in = Integer.parseInt(userIn);
} else if (userIn != null userIn.equals("3")) {
in = Integer.parseInt(userIn);
} else if (userIn != null
userIn.trim().toUpperCase().equals("Q")) {
in = 4;
} else {
System.out.println("你输入的指令不正确！请重新输入。");
continue;
}
switch (in) {
case 1:
double add_money = 0;
while (true) {
System.out.print("请输入你要存入的金额：");
try {
add_money = Double.parseDouble(getString());
} catch (Exception e) {
System.out.println("金额输入不正确！");
continue;
}
break;
}
MONEY += add_money;
System.out.println("存入的金额是" + add_money
+ "\r\n请选择你要的操作：");
break;
case 2:
double money = 0;
while (true) {
System.out.print("请输入你要取出的金额：");
try {
money = Double.parseDouble(getString());
} catch (Exception e) {
System.out.println("金额输入不正确！");
continue;
}
if (money MONEY) {
System.out.println("取出的金额大于现有存款，请重新输入要取出的金额！");
continue;
}
break;
}
MONEY -= money;
System.out.println("取出的金额是" + money + "\r\n请选择你要的操作：");
break;
case 3:
System.out.println("你的余额是：" + MONEY + "\r\n请选择你要的操作：");
break;
case 4:
System.out.println("程序退出！");
return;
}
}
} else {
System.out.println("错误：用户名与密码不匹配！\r\n");
System.out.println("按任意键:重新输入用户名和密码。");
System.out.println("q:退出程序。");
System.out.print("请选择:");
String in = getString();
if (in.trim().toUpperCase().equals("Q")) {
break;
}
}
}
}
public static String getString() {
String str = null;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
try {
str = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
Q5: 使用JAVA编写一个简单的银行存取款程序
package com.lw.thread;
/*
银行账户类Account（不能透支），
包含账号id（10~16位数字），密码password（6位数字），户主姓名name，余额balence
*/
public class Account {
private String id;
private int password;
private String name;
private double balence;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public int getPassword() {
return password;
}
public void setPassword(int password) {
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getBalence() {
return balence;
}
public void setBalence(double balence) {
this.balence = balence;
}
/*
* 默认构造账户信息为：1111111111111111,666666，钱三多，888888.88。
*/
public Account() {
super();
this.id = "1111111111111111";
this.password = 666666;
this.name = "钱三多";
this.balence = 888888.88;
}
/*
* 另一个构造方法带4个参数分别初始化4个属性（带数据有效性验证）。
*/
public Account(String id, int password, String name, double balence) {
this.id = id;
this.password = password;
this.name = name;
this.balence = balence;
}
/*
* 查询余额
*/
public static double selectMoney(Account account) {
return account.getBalence();
}
/*
* 存钱
*/
public static String setMoney(Account account, double balence) {
if (balence 0) {
return "存钱失败，请正确放入！";
}
double d = balence + account.getBalence();
account.setBalence(d);
return "您存入了" + balence + "元，现账户余额为+" + d;
}
/*
* 取钱
*/
public static String getMoney(Account account, double balence) {
double d = account.getBalence();
if (balence d) {
return "您的余额不足！";
}
account.setBalence(d - balence);
return "您取出了" + balence + "元，现账户余额为+" + account.getBalence();
}
}
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