如何以24小時格式輸入xx：xx而不顯示「：」給出錯誤？

Question

我必須將這種格式的24小時制轉換爲分鐘，同時允許用戶輸入他們想要的任何時間。到目前爲止，我的代碼只允許他們進入XX：XX，只要兩個XX之間有一個空格，而不是冒號。我曾嘗試使用分隔符，但只是最後兩個XX將作爲分鐘的剪輯。

import java.util.*; 

public class TaskA { 

    ///import the tools necessary i.e java.util.* and Scanner console. I have also used a delimiter to render the ":" as not being read. 

    static Scanner console = new Scanner(System.in).useDelimiter(":"); 

    public static void main(String[] args) { 

    ///This is how I will define the time. using both hours and minutes for the console. 

    int hours; 
    int minutes; 
    int total_mins; 

    ///Here I have written how the question will come out and what the user will have to enter. 

     System.out.print("Specify time (HH:MM) : "); 

    /// Here I have the hours and minutes being inputed, as well as a draft on the final statement. 

     hours = console.nextInt(); 
     minutes = console.nextInt(); 

    ///This is the mathematical equation for total minutes. 

     total_mins = (hours * 60) + minutes; 

    ///final statement. 

     System.out.print(hours + ":" + minutes + " = " + total_mins + " Mins !"); 
    } 
} 

Answer 1

我會把它當作一個字符串，然後分割它。

String line = console.nextLine(); 
hours = Integer.parseInt(line.split(":")[0]); 
minutes = Integer.parseInt(line.split(":")[1]); 

Answer 2

這是它是如何做：

String[] splitParts = console.nextLine().split(":"); 
if (splitParts.length >= 2) 
    try 
    { 
     hours = Integer.parseInt(splitParts[0]); 
     minutes = Integer.parseInt(splitParts[1]); 
    } catch (NumberFormatException e) 
    { 
     System.err.println("The entered numbers were of invalid format!"); 
    } 
else 
{ 
    System.err.println("Please enter a input of format ##:##!"); 
} 

該代碼處理用戶輸入的危險，以及，你可以看到。