組合在一起的單詞

Question

爲什麼我的代碼將舊單詞與新單詞相結合？輸入是「香蕉」輸出「香蕉」新輸入「狗」輸出「香蕉」？

public static void main(String [] args) 
{ 
    Scanner keyboard = new Scanner(System.in); 
    String word, afc, newWord; 
    String s=""; 

    do 
    { 
     word=keyboard.next().toLowerCase(); 
     int i =word.length()-1; 
     char firstLetter=word.charAt(0); 
     afc=word.substring(1); 
     newWord= afc+firstLetter; 

     for(; i>=0 ;) 
     { 
      s += newWord.charAt(i--); 
     } 
     System.out.println(word + "," + s); 

     if (s.equals(word)) 
      System.out.println("Words are equal."); 
     else 
      System.out.println("Words are not equal."); 
    } 
    while (!(word.equals("quit"))); 

} 

Answer 1

你是不是在循環的開始清除s變量。

應該

Scanner keyboard = new Scanner(System.in); 
    String word, afc, newWord;  

    do 
    { 
     String s=""; 
     ... 

Answer 2

試試這個

public static void main(String [] args) 
{ 
    Scanner keyboard = new Scanner(System.in); 
    String word, afc, newWord; 
    String s=""; 

    do 
    { 
     s = ""; 
     word=keyboard.next().toLowerCase(); 
     int i =word.length()-1; 
     char firstLetter=word.charAt(0); 
     afc=word.substring(1); 
     newWord= afc+firstLetter; 

     for(; i>=0 ;) 
     { 
      s += newWord.charAt(i--); 
     } 
     System.out.println(word + "," + s); 

     if (s.equals(word)) 
      System.out.println("Words are equal."); 
     else 
      System.out.println("Words are not equal."); 
    } 
    while (!(word.equals("quit"))); 

}