public class Account {private double balance;public Account(double balance){super();this.balance=balance;}public Account(){super();}public void withdraw(double money) throws NotFullBalanceException{//取款if(money<=balance){balance -= money;}else{throw new NotFullBalanceException("余额不足");}}public void despoit(double money){//存款balance += money;}public double getBalance() {return balance; }}

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public class NotFullBalanceException extends Exception{public NotFullBalanceException(){}public NotFullBalanceException(String msg){super(msg);}
}

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import java.util.InputMismatchException;
import java.util.Scanner;
public class TestAccount {public static void main(String[] args) {Scanner scn = new Scanner(System.in);Account account = new Account(10000);while(true){System.out.println("****当前账户余额："+ account.getBalance()+"****");System.out.println("1.存钱 2.取钱 0.退出");System.out.print("请选择(1,2,0):");String cmd = scn.next().trim();if("0".equals(cmd)){ //避免空指针异常，将常量写在前面System.out.println("bye..."); break;}else if("1".equals(cmd)){//1.存钱System.out.print("请输入金额:");try{double money = scn.nextDouble(); account.despoit(money); }catch(InputMismatchException e){System.out.println("输入有误...");scn.next(); }}else if("2".equals(cmd)){//2.取钱System.out.print("请输入金额:");try { double money = scn.nextDouble();account.withdraw(money);}catch(InputMismatchException e){System.out.println("输入有误..."); scn.next();}catch (NotFullBalanceException e) {1              System.out.println(e.getMessage());}}else{System.out.println("没有这个命令...");}}}
}