java - 如何向我的代码添加错误处理？

Question

我试图让用户有 3 次机会输入正确的输入，第三次尝试后程序应该关闭，我将给出一个自定义字符串。如果他们在任何时候输入有效数据，程序就应该执行。我想在代码中添加错误处理:

import java.util.Scanner;

{

public static void main(String[] args){
Scanner in = new Scanner(System.in);
int month, day; String season = null;
System.out.print("Enter Month & Day: ");
month = in.nextInt(); day = in.nextInt();
if(1 <= month && month <= 3){
    season = "Winter";
    if((month == 3) && (21 <= day))
        season = "Spring";
} else if (4 <= month && month <=6){
    season = "Spring";
    if((month == 6) && (21 <= day))
        season = "Summer";
} else if (7 <=month && month <=9){
    season = "Summer";
    if((month == 9) && (21 <= day))
        season = "Fall";
} else if (10 <= month && month <= 12){
    season = "Fall";
    if((month == 12) && (21 <= day))
        season = "Winter";
}
System.out.println(season);
}
}

Answer 1

这样的事情可能会对您有所帮助。代码是不言自明的。

private static final int RETRY_COUNT = 3

retryCount = 0
boolean invalid = true;
while(invalid && retryCount++ < RETRY_COUNT){
   try{
   invalid = false;
   Scanner sc = new Scanner(System.in)

   .
   .
   .
   }catch(Exception e){
     invalid = true;
   }   
}