java - 如何在构造函数中设置到期日期？

Question

我正在尝试创建一个 TravelCard 类，该类还应检查该卡是否仍然可用(未过期)。但是我有这个错误

unreported exception ParseExeption; must be caught or declared to be thrown

在这一行

this.expirationDate = sdf.parse(expiry);

如何在构造函数中设置到期日期？

有人可能会注意到，我以前从未使用过日期。而且我在 Java 方面还很陌生。

package something;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class TravelCard {
    private double balance;
    private SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
    private Date expirationDate;
    private Date today = Calendar.getInstance().getTime();

    public TravelCard(double balance, String expiry){
        sdf.setLenient(false);
        this.balance = balance;
        this.expirationDate = sdf.parse(expiry);
    }

    public void pay(double price){
        if (today.before(expirationDate)){
            if(this.balance >= price){
                this.balance -= price;
            }
            else {
                System.out.println("Insufficient funds");
            }
        }
        else {
            System.out.println("Card expired");
        }
    }

    public double getBalance(){
        return balance;
    }

}

Answer 1

这意味着，parse() 方法抛出一个已检查的异常，catch 异常或throw。

捕获异常的方法:

public void TravelCard(double balance, String expiry){
        sdf.setLenient(false);
        this.balance = balance;
         try {
             this.expirationDate = sdf.parse(expiry);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }

抛出异常的方式:

 public void TravelCard(double balance, String expiry) throws ParseException{