java - Java中的OverLimit异常处理

引发异常的程序，指出“直到结帐后才能进行进一步交易”。客户的未付信用卡金额超过$ 2000或最多45天未付。假定当前日期为01/12/2015。


创建扩展OverLimitException的自定义异常类Exception。
添加一个带有Throwable对象的构造函数，使用super()调用超类构造函数，并按照问题语句中的描述打印输出。


我创建了两个类别，一个主要帐户，另一个帐户

Account.java

import java.text.*;
import java.util.*;
import java.util.concurrent.TimeUnit;

public class Account {

String accountNumber;
String accountName;
Double dueAmount;

public Account(String accountNumber, String accountName,Double dueAmount) throws ParseException {
    this.accountNumber = accountNumber;
    this.accountName = accountName;
    this.dueAmount = dueAmount;
}

public Account() {
}

public Boolean validate(String dueDate,Double unpaid,Double amount){
    DateFormat sf = new SimpleDateFormat("dd/MM/yyyy");
    sf.setLenient(false);
    try{
        Date d = sf.parse(dueDate);
        Date d1 = sf.parse("01/12/2015");
       // long curDate = new Date().getTime();
        long diff =d1.getTime() - d.getTime();
        long daysDiff = TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
        if(daysDiff > 45 || unpaid > 2000){
            throw new OverLimitException("Further Transactions Not Possible until clearance of bill.");
        }
    }catch(Exception e){
        return false;
    }
    return true;
}

public void display() {
    System.out.println("Transaction successsfully completed.");
    System.out.println("Account Number : "+this.accountNumber);
    System.out.println("Account Name : "+this.accountName);
    System.out.println("Unpaid Amount : "+this.dueAmount);
}
}

但是出现错误说明

 error: cannot find symbol
 throw new OverLimitException("Further Transactions Not Possible until clearance of bill.");
 ^
 symbol: class OverLimitException

谁能帮我解决这个问题？

最佳答案

valiade函数必须抛出OverLimitException并且必须对其进行定义

public Boolean validate(String dueDate,Double unpaid,Double amount)
      throws OverLimitException{
      ...
      if(daysDiff > 45 || unpaid > 2000){
          throw new OverLimitException("Further Transactions Not Possible  until clearance of bill.");
    }
    ...

}

并实现OverLimitException;这是一个example

     public class OverLimitException extends Exception {
         public OverLimitException(String message) {
            super(message);
         }
     }