caesar加密代码中的问题 [英] Question in caesar encryption code

问题描述

这个凯撒加密代码



有些错误，请求帮助我

this code of caesar encryption

have some error ,, pleas help me

package encryption;
import java.util.*;
/**
 *
 * @author Toshiba
 */
public class Encryption {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
      //  ENCR n =new ENCR();
       Scanner S = new Scanner(System.in);
       System.out.print(" Enter the text");    
        String massege  = S.next();
       System.out.print(" Enter the kay");    
        int key = S.nextInt();
    }
  
    public String NN (  String massege  , int kay )
    
    {
    
    String  STR= "ABCDEFGHIJKLMNOPQRSTWXYZ" ; 
    char current;
    String chyfer= ""; 
    for (int i=0; i<=massege .length();i++)
    {
    
    current = massege .charAt(i);
    
    for (int y= 0 ; y<=STR.length(); y++) {
            if(current==STR.charAt(y))
            {
             
             chyfer + = STR.charAt((kay+y)%26);
             
             return chyfer ;
             
             }
        }
    }
     return chyfer ;
    }
}

推荐答案

在行中

Hi,

In the line

chyfer + = STR.charAt((kay+y)%26); 

+ 和 = 之间的空格。删除空格：

there''s a space between + and =. Remove the space:

chyfer += STR.charAt((kay+y)%26); 

希望这有帮助。

Hope this helps.

修改后的错误得到以下代码，但它不运行>>





是什么原因？

After modified the mistakes got the following code, but it is not run >>


What is the reason ؟؟

package encryption;
import java.util.*;
public class Encryption {
 public static void main(String[] args) {
        Encryption enc = new Encryption();
       Scanner S = new Scanner(System.in);
       System.out.println(" Enter the text");
        String massege  = S.next();
       System.out.println(" Enter the kay");
        int key = S.nextInt();

        System.out.println( " the word chyfer is " + enc.NN( massege, key) );
    }
    public  String NN (  String massege  , int kay )
    {
    String  STR= "ABCDEFGHIJKLMNOPQRSTWXYZ" ;
    char current;
    String chyfer= "";
    for (int i=0; i<=massege .length();i++)
    {
    current = massege .charAt(i);
    for (int y= 0 ; y<=STR.length(); y++) {
            if(current==STR.charAt(y))
            {
             chyfer+=STR.charAt((kay+y)%26);}
    }}
     return chyfer ;
}}

thi是输出



输入文字

jg

输入kay

2

线程main中的异常java.lang.StringIndexOutOfBoundsException：字符串索引out of范围：24

at java.lang.String.charAt（String.java:686)

at encryption.Encryption

thi is the output

Enter the text
jg
Enter the kay
2
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 24
at java.lang.String.charAt(String.java:686)
at encryption.Encryption

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