shift array by k

Question

我正在研究一個小型的java程序，它的基本功能和我的功能之一是通過給定的鍵來改變字母表。我已經掌握了它的工作方式，但是它的方向錯了，我怎麼能讓它轉向另一個方向呢？

public static char[] ourAlphabet = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; 


    public char[] shiftAlphabet(int key) { 

      int length = ourAlphabet.length; 

      char[] result = new char[length]; 

      for (int i=0; i < length; i++) 
      { 
       result[(i+key+26)%length] = ourAlphabet[i]; 
      } 

      return result; 
    } 

我猜它很簡單，但它讓我困惑！

例如;用鍵19產生 ; hijklmnopqrstuvwxyzabcdefg

什麼時候應該產生; TUVWXYZABCDEFGHIJKLMNOPQRS

Answer 1

如果使用result[(i-key+26)%length] = ourAlphabet[i];

然而，如果長度應該努力= 26，這仍然會給一個錯誤的結果！

因此我會用長度替換26;

result[(i-key+length)%length] = ourAlphabet[i]; 

Answer 2

更改爲：

result[i] = ourAlphabet[(i+key)%length]; 

Answer 3

public static char[] ourAlphabet = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; 


public char[] shiftAlphabet(int key) { 

     int length = ourAlphabet.length; 

     char[] result = new char[length]; 

     for (int i=0; i < length; i++) 
     { 
      ourAlphabet[(i+key+26)%length] = result[i]; 
     } 

     return result; 
}