Java字符串數組，並從用戶更換某個字大寫

Question

以下是完整的問題： ... 我的代碼

import java.util.Scanner; 

import java.lang.StringBuilder; 

public class javaAPIString { 

    public static void main(String[]args) 
    { 
     String SentenceFromUser = ""; 
     String IndiWordFromUser = ""; 
    /// String upper = IndiWordFromUser.toUpperCase(); 
     //String[] words = SentenceFromUser.split("\\s+"); 

     char ans; 

      Scanner keyboard = new Scanner(System.in); 
      do 
      { 
       final StringBuilder result = new StringBuilder(SentenceFromUser.length()); 
       String[] words = SentenceFromUser.split("\\s"); 
       System.out.println("Enter a sentence :"); 
       SentenceFromUser = keyboard.nextLine(); 

       System.out.println("Enter a word : "); 
       IndiWordFromUser = keyboard.next(); 
     /// IndiWordFromUser = upper; 

       for(int i =0; i > words.length; i++) 
       { 
        if (i > 0){ 
         result.append(" "); 
         } 
         result.append(Character.toUpperCase(words[i].charAt(0))).append(
            words[i].substring(1)); 
       } 

     // System.out.println("The Output is : " + SentenceFromUser); 


       System.out.println("Do you want to enter another sentence and word ? If yes please type 'Y' or 'y'."); 
       ans = keyboard.next().charAt(0); 
      } 
      while ((ans == 'Y') || (ans == 'Y')); 
    } 
} 

---

我的代碼我的輸出/問題： 輸入句子： 我喜歡cookies 輸入一個字詞： cookies 輸出結果是：我喜歡cookies 你想輸入另一句話嗎？如果是，請輸入'Y'或'y'。

它返回相同的原始句子而不更改爲第二個輸入的大寫字符以替換爲所有CAPS。

Answer 1

我希望我的解決方案將幫助你出去！ :)

import java.util.Scanner; 

public class Solution { 

    private static Scanner in = new Scanner(System.in); 

    public static void main(String[] args) { 
     getTextFromUser(); 
    } 

    private static void getTextFromUser() { 
     print("Enter Sentence Here: "); 
     String text = in.nextLine(); 

     print("\nDo you want to capitalize words in sentence? Y/N: "); 

     while (in.nextLine().equalsIgnoreCase("y")) { 
      print("Enter Word: "); 
      print("Modified Text: " + changeWord(text, in.nextLine())); 
      print("\n\nDo you want to capitalize words in sentence? Y/N"); 
     } 
    } 

    private static String changeWord(String text, String word) { 
     return text.replaceAll("\\b" + word + "\\b" /* \\b Means word 
     boundary */, word.toUpperCase()); // No validations done. 
    } 

    private static void print(String message) { 
     System.out.print(message); 
    } 

} 

Answer 2

只是有些事情：

1. 請使用Java命名約定的變量名

2. ，當你執行你的代碼，該指令將覆蓋用戶輸入一個空字符串。

   IndiWordFromUser = upper;

3. String[] words = SentenceFromUser.split("\\s"); ...要拆分一個空字符串第一次和老句子的其他運行

4. 變量IndiWordFromUser是從來不看