ROTDir

package encoding;

import java.util.HashMap;
import java.util.Map;

@SuppressWarnings("serial")
public class ROTDict extends HashMap<Character, Character>{

    public ROTDict(byte szam){
        super();

        char[] ABC = {'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'};
        char[] abc = {'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'};
        for(int i = 0; i < ABC.length; ++i){
            this.put(ABC[i],ABC[(i+szam)%ABC.length]);
        }
        for(int i = 0; i < abc.length; ++i){
            this.put(abc[i],abc[(i+szam)%abc.length]);
        }
    }
    public char encode(char c){
        if(!containsKey(c)){
            return c;
        }
        return this.get(c);
    }
    public char decode(char c){
        char kulcs = '0';
        if(!this.containsValue(c)){
            return c;
        }
        else{
            for(Map.Entry a: this.entrySet()){
                if((Character)c == a.getValue()){
                    kulcs = (char) a.getKey();
                }
            }
            return kulcs;
        }
    }
}