java - Java程序中的字符串数组

Question

我必须制作一个程序，从用户那里获取一个短语，然后将他们输入的短语的加密代码返回给用户。我们要使用数组或枚举列表来保存数据。我使用 ROT13 进行编码(将每个英文字母替换为沿字母表向前或向后的 13 个位置)。我的程序运行但它只允许我输入一个短语，然后说:

java.lang.ArrayIndexOutOfBoundsException: 26
    at J4_1_EncryptionVer2.main(J4_1_EncryptionVer2.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

我不确定我的程序有什么问题!请帮忙!谢谢

        import java.io.*;

public class J4_1_EncryptionVer2
{
  public static void main (String [] args) throws IOException
  {
    BufferedReader myInput = new BufferedReader (new InputStreamReader (System.in));

   String letterA [] = {"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"};
   String letterB [] = {"N","O","P","Q","R","S","T","U","V","W","X","Y","Z","A","B","C","D","E","F","G","H","I","J","K","L","M"};

    System.out.println ("Please enter a phrase: ");
    String message = myInput.readLine();

    int x = 0; 
    while (x < message.length()){

      String text = message;
      String letter = Character.toString(text.charAt(x));
        x++;

      int i = 0;

     if(letter.equals (letterA[i])){
        System.out.println (letterB[i]);
      }
      while (!(letter.equals (letterA[i]))){
        i++;
        if(letter.equals (letterA[i])){
        System.out.println (letterB[i]);
      }

    }
  }
}
}

Answer 1

三个问题:

1. while (x <= message.length())应该是 while (x < message.length())
2. x++应该在text.charAt(x)之后移动
3. 使用equals比较字符串值。

当然你也只能用A-Z来测试