需要在輸出行中打印字符

Question

當輸入一個字母而不是整數時，我需要輸出這些行。我不知道如何讓它做到這一點：我有代碼，如果你能幫助我解決這個問題，我需要在下面發佈，謝謝。

This is what I am getting: 
Input a valid whole number: abc 
Input is not a valid number 
Press any key to continue . . . 

This is what I need: 
Input a valid whole number: **ABC** 
**ABC** is not a valid number 
Press any key to continue . . . 

below is what i have so far: 

import java.io.PrintStream; 
import java.util.Scanner; 

public class FinalPractice 
{ 
    public static void main(String [] args) 
    { 
     Scanner scanner = new Scanner(System.in); 
     PrintStream out = System.out; 

     out.print("Input a valid whole number: "); 

     String input = scanner.next(); 
     int number; 

     try { 
      number = Integer.parseInt(input); 
     } catch (Exception e) { 
      out.println("Input is not a valid number"); 
      return; 
     } 

     if (number < 0) { 
      out.println(number + " is not a valid number"); 
      return; 
     } 

     printDivisors(number); 
    } 

    private static void printDivisors(int x){ 
     PrintStream out = System.out; 
     for (int i=1; i<x; i++) { 
      if (isDivisibleBy(x, i)){ 
       out.println(x + " is divisible by " + i); 
      } else { 
       out.println(x + " is not divisible by " + i); 
      } 
     } 
    } 

    private static Boolean isDivisibleBy(int x, int divisor){ 
     while (x > 0) { 
      x -= divisor; 
      if (x == 0){ 
       return true; 
      } 
     } 
     return false; 
    } 
} 

Answer 1

如果我的理解正確，您希望您的錯誤消息包含用戶實際輸入的內容。 更改

out.println("Input is not a valid number"); 

到

out.println (input + " is not a valid number"); 

這需要您的變量input，與字符串的其餘部分合並，然後它會顯示到輸出控制檯。