我正在编写约会程序,并且遇到以下错误:
AppointmentNew.java:68: unreported exception java.text.ParseException; must be caught or declared to be thrown
Date lowDate = sdf.parse(stdin.nextLine());
^
AppointmentNew.java:70: unreported exception java.text.ParseException; must be caught or declared to be thrown
Date highDate = sdf.parse(stdin.nextLine());
^
AppointmentNew.java:77: unreported exception java.text.ParseException; must be caught or declared to be thrown
Date newCurrentDate = sdf.parse(currentDate);
我很确定我需要进行尝试/捕获,但是我不确定如何产生这种效果。我得到错误的部分是它要求用户输入BEGINNING和END日期,当他们这样做时,程序将打印出他们在两个日期之间进行的约会。
这是我的代码:
import java.util.*;
import java.text.SimpleDateFormat;
import java.util.Date;
public class AppointmentNew
{
public static void main (String[] args)
{
ArrayList<String> list = new ArrayList<String>();
Scanner stdin = new Scanner(System.in);
String choice = "";
int choiceNum = 0;
String date = "";
String descrip = "";
int type = 0;
String typeChose = "";
System.out.println("Welcome to Appointment App!\n");
System.out.println("\t============================");
do
{
System.out.print("\n\tMake Choice (1: New, 2: Print Range, 3: Print All, 4: Quit) ");
choice = stdin.nextLine();
choiceNum = Integer.parseInt(choice);
if (choiceNum == 1)
{
System.out.print("\n\n\tEnter New Appointment Date in mm/dd/yyyy format: ");
date = stdin.nextLine();
System.out.print("\n\n\tEnter New Appointment Description: ");
descrip = stdin.nextLine();
System.out.print("\n\n\tEnter Type (1 = Once, 2 = Daily, 3 = Monthly): ");
type = stdin.nextInt();
stdin.nextLine();
if (type == 1)
{
Once once = new Once(date, descrip);
typeChose = "One-Time";
}
else if (type == 2)
{
Daily daily = new Daily(date, descrip);
typeChose = "Daily";
}
else
{
Monthly monthly = new Monthly(date, descrip);
typeChose = "Monthly";
}
String stringToAdd = "";
stringToAdd = (date + " : \"" + descrip + "\", " + typeChose);
list.add(stringToAdd);
System.out.println("\n\n\tNew " + typeChose + " Appointment Added for " + date + "\n");
System.out.println("\t============================\n");
}
if (choiceNum == 2)
{
System.out.print("\n\n\tEnter START Date in mm/dd/yyyy format: ");
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
Date lowDate = sdf.parse(stdin.nextLine());
System.out.print("\n\n\tEnter END Date in mm/dd/yyyy format: ");
Date highDate = sdf.parse(stdin.nextLine());
for(int i = 0; i < list.size(); i++)
{
int dateSpot = list.get(i).indexOf(" ");
String currentDate = list.get(i);
currentDate.substring(0, dateSpot);
Date newCurrentDate = sdf.parse(currentDate);
if (newCurrentDate.compareTo(lowDate) >= 0 && newCurrentDate.compareTo(highDate) <= 0)
{
System.out.println("\n\t" + list.get(i));
}
}
}
if (choiceNum == 3)
{
for(int i = 0; i < list.size(); i++)
{
System.out.println("\n\t" + list.get(i));
}
}
}while (choiceNum != 4);
}
}
参考方案
格式为:
try {
//The code you are trying to exception handle
}
catch (Exception e) {
//The handling for the code
}
将解析调用放在try块中(最好是每个调用),然后在catch块中指定如果解析失败会发生什么。
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