消息解码/加密程序输出

Question

public static void encode(String message, int shiftKey)
{
    String [] array = message.split("");
    String encoded = "";
    for (String a : array)
    {
        int finalIndex;
        int index = alphabet.indexOf(a);
        finalIndex = index + shiftKey;
        encoded += alphabet.charAt(finalIndex);
    }
    System.out.println(encoded);
}

完整代码

import java.util.*;
import java.io.*;
public class CaesarShiftTester
{
public static void main (String[] args)
{
    boolean running = true;
    while (running){
        Scanner in = new Scanner (System.in);
        System.out.println("Encryption or Decryption? (E/D): " );
        String answer = in.next();

    if (answer.equalsIgnoreCase("e"))
    {
        System.out.println("Enter message: ");
        String message = in.next();
        System.out.println("Enter Shift Key: " );
        int shiftKey = in.nextInt(); 
        CaesarShiftEncryption.encode(message, shiftKey);

        System.out.println("Quit? (Y/N): ");
        String again = in.next();
        if (again.equalsIgnoreCase("Y"))
            running = false;
        else
            running = true;
    }

    else if (answer.equalsIgnoreCase("d"))
    {
        System.out.println("Enter message: ");
        String message = in.next();
        System.out.println("Enter Shift Key: " );
        int shiftKey = in.nextInt();
        CaesarShiftEncryption.decode(message, shiftKey);

        System.out.println("Quit? (Y/N): ");
        String again = in.next();
        if (again.equalsIgnoreCase("Y"))
                running = false;
        else
            running = true;
    }
    }


}
}

\

import java.io.*;
import java.util.*;
public class CaesarShiftEncryption
{
private static final String alphabet = "abcdefghijklmnopqrstuvwxyz";
public static void encode(String message, int shiftKey)
{
    String [] array = message.split("");

    String encoded = "";
    for (String a : array)
    {
        System.out.println(a);

        int finalIndex;
        int index = alphabet.indexOf(a);
        finalIndex = index + shiftKey;
        System.out.println(finalIndex);
        encoded += alphabet.charAt(finalIndex);
    }
    System.out.println(encoded);
}


public static void decode(String message, int shiftKey)
{
    char shifted;
    String encoded = "";
    for (int i = 0; i < message.length(); i ++)
    {
        char nextChar = message.charAt(i);
        shifted = (char)(nextChar - shiftKey);
        encoded += shifted;
    }
    System.out.println("Encoded: " + encoded);  
 } 
 }

Answer 1

JDK问题。

考虑使用JDK 8..

在JDK7上，如果进行拆分（“”），拆分函数会在开头添加一个额外的元素。