文件那块搞了好久，全在main函数里，挺乱的，最终还是换行符的问题导致写入读出都有问题。
文件会直接在D盘下，叫data5，我没放在存代码的目录里。
存钱的类
package Bank;
class SaveAccount implements Runnable{
private Account a;
private int money;
public SaveAccount() {
super();
}
public SaveAccount(Account a, int money) {
super();
this.a = a;
this.money = money;
}
@Override
public void run() {
synchronized (a)
{
try {
int currentMoney = a.searchMoney();
Thread.sleep(1000);
a.saveMoney(money);
System.out.println("尊敬的客户：" + a.getName() + "您好！ 您的账户余额" + currentMoney
+ "元，您存入" + this.money + "元，当前账户余额为：" + a.searchMoney() + "元");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
取钱的类
package Bank;
class GetMoney implements Runnable{
private Account a;
private int money;
public GetMoney() {
super();
}
public GetMoney(Account a, int money) {
super();
this.a = a;
this.money = money;
}
@Override
public void run() {
synchronized (a)
{
try {
int currentMoney = a.searchMoney();
Thread.sleep(1000);
a.getMoney(money);
System.out.println("尊敬的客户：" + a.getName() + "您好！ 您的账户余额" + currentMoney
+ "元，您取出" + this.money + "元，当前账户余额为：" + a.searchMoney() + "元");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
账户类
package Bank;
class Account{
private String name;
private int value;
public int getMoney(int money){
if(money >= this.value){
this.value = 0;
}else{
this.value = this.value - money;
}
return money;
}
public void saveMoney(int money){
this.value = this.value + money;
}
public int searchMoney(){
return this.value;
}
public Account() {
super();
}
public Account(String name, int value) {
super();
this.name = name;
this.value = value;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
Main
package Bank;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Scanner;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
//学生信息储存在集合类中
ArrayList<Account> array = new ArrayList<Account>();
//启动应用便开始从硬盘加载数据
try {
loadData(array);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("向文件存新账户请按1\n查看文件已有账户请按2");
int k=sc.nextInt();
if (k==1) {
System.out.println("请输入2个账户信息来存入文件，格式为姓名和金额");
String name1 = sc.next();
int value1 = sc.nextInt();
Account account = new Account(name1, value1);
String name2 = sc.next();
int value2 = sc.nextInt();
Account account2 = new Account(name2, value2);
array.add(account);
array.add(account2);
try {
storeData(array); //将两个账户存入文件
} catch (IOException e) {
e.printStackTrace();
}
query(array);
}else if(k==2){
query(array);
}
System.out.println("输入你要从文件中取出来操作的账户姓名");
String Tname=sc.next();
for (Account a:array){
if (Tname.equals(a.getName())){
System.out.println("请输入存钱的金额,不存输入0");
int themoney=sc.nextInt();
SaveAccount sa = new SaveAccount(a, themoney);
Thread t1 = new Thread(sa,a.getName());
t1.start();
System.out.println("请输入取钱金额，不取输入0");
int themoney2=sc.nextInt();
GetMoney gm =new GetMoney(a, themoney2);
Thread t = new Thread(gm,a.getName());
t.start();
try {
storeData(array); //修改后存回文件
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("操作完毕");
System.out.println("是否查看更新后的账户？\n是请按1，退出请按2");
int check=sc.nextInt();
if (check==1) query(array);
}
}
try {
storeData(array); //完成存钱，取钱后将信息写入文件。
} catch (IOException e) {
e.printStackTrace();
}
}
private static void query(ArrayList<Account> array){
if(array.size() == 0){
System.out.println("暂时未存储任何信息，请重新选择。");
return;
}
System.out.println("姓名\t\t金额");
for(int i=0;i<array.size();i++){
Account s = array.get(i);
System.out.println(s.getName()+"\t"+s.getValue()+"\t");
}
}
private static void loadData(ArrayList<Account> array) throws IOException{
//初次打开应用会创建文件
File file= new File("D:\\data5.txt");
if(!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("初次启动初始化完成！");
}
//从文件中读取数据进集合
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while((line = br.readLine())!=null){
String[] str;
str = line.split("&");
Account s = new Account();
s.setName(str[0]);
s.setValue(Integer.parseInt(str[1]));
array.add(s);
}
br.close();
}
//储存数据到文件中
private static void storeData(ArrayList<Account> array) throws IOException{
File file= new File("D:\\data5.txt");
if(!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//直接将数据全部存储到文件中，不用追加方法，也方便增删查改
//如何信息量比较大就不适应
BufferedWriter bw = new BufferedWriter(new FileWriter(file));
//将数据存储进文件
for(int i=0;i<array.size();i++){
Account s = array.get(i);
bw.write(s.getName());
// bw.write(s.getName(),0,s.getName().length()-1);
bw.write('&');//间隔不同数据
String sgV=s.getValue()+"";
bw.write(sgV + "\n");
// bw.write(sgV,0,sgV.length()-1);
// bw.newLine();
}
bw.flush();
bw.close();
}
}