自定义抛出throw 对象练习

package ltb6w;
import java.util.*;
 
public class Bank {
 
    private String select;
    private String select2;
 
    private double balance=0.0; //余额
    private double inputbalance=0.0;
 
    private Scanner sc=new Scanner(System.in);
 
    public Bank() {
 
        System.out.println("请输入存款额度:");
 
    }
 
    @SuppressWarnings("serial")
    class  NotSufficientFunds extends Exception { //自定义异常类
 
        private String insufficient;
 
        NotSufficientFunds(String s ) {
 
            insufficient=s;
        }
 
        public String getMessage() {
 
            return insufficient;
 
        }
 
    }                                              
 
    public void deposite() throws Exception{//存款操作
 
        inputbalance=sc.nextInt();
 
        if(inputbalance<0) {
 
            throw new NotSufficientFunds("存款不能是负数");  //抛出自定义异常
        }
 
        this.balance=inputbalance+balance;
 
        System.out.println("存款总额:"+balance);
    }        
 
    public void withdrawa() throws Exception{//取款操作
 
        System.out.println("请输入取款数:");
 
        this.balance=balance-sc.nextInt();
 
        if (balance<0) { //激发异常类
 
                throw new NotSufficientFunds("余额已经是负数了"); 
 
        }    
 
        System.out.println("余额:"+this.getbalawal());
    }            
 
    public double getbalawal() { //获取余额操作
 
        return balance;
    }
 
    public static void main(String[] args) {
 
        Bank b=new Bank();
 
        while (true) {  
 
            try {
                b.deposite();
            } catch (Exception e) {
 
                e.printStackTrace();
            }
 
            System.out.println("是否继续存款：是or否");
 
            try {
                b.select=b.sc.next(); // 容易出异常的地方
 
            }catch (InputMismatchException e) {
 
                System.out.println("不要输入(是or否)之外无关的存款数据，从来，再来。");
 
                continue;
 
            }
 
            if("否".equals(b.select)) {    
 
            while (true) {
 
                System.out.println("看仔细了！！！是否还继续取款：是or否");
 
                try {
                    b.select2=b.sc.next(); // 容易出异常的地方
 
                }catch (InputMismatchException e) {
 
                    System.out.println("不要输入(是or否)之外无关的数据，从来，再来。");
 
                    continue;
 
                }
 
                if("是".equals(b.select2)) {
 
                    try {
                        b.withdrawa();
 
                        break;
                    } catch (Exception e) {
 
                        e.printStackTrace();
                    }
 
                }else if ("否".equals(b.select2)){
 
                    System.out.println("不管你选不选否都当做退出。["+b.select2+"]");
 
                    break;
                }
 
            }    
 
            System.out.println("已经成功退出");
 
              break;
 
            }else if("是".equals(b.select)) {
                System.out.println("继续输入金额，come on baby!");
            }
 
        }
 
    }
 
}