MonoAlphabeticCipher

package monoalphabeticcipher;

import sun.security.pkcs11.wrapper.CK_DATE;

/**
 *
 * @author Md Ali Shaikh
 */
public class MonoAlphabeticCipher {

    public static String ALPHABET ="abcdefghijklmnopqrstuvwxyz";
    public static String cryptoAlpha="abcdefghijklmnopqrstuvwxyz";
    public static String cryptoKey = "";
        public String getCipheredText(String plainText,String key){
            plainText=plainText.toLowerCase();
            key=key.toLowerCase();
            String cipheredText = "";
                
                cryptoAlpha = key + cryptoAlpha;
		char[] chars = cryptoAlpha.toCharArray();
                int len = chars.length;
                for (int i = 0; i < len; i++) {
                    String ch = String.valueOf(chars[i]);
                if(!cryptoKey.contains(ch)){
                    cryptoKey += ch;
                }
               }
                
		for (int k = 0; k < plainText.length(); k++) {
			char plainChar = plainText.charAt(k);
			int index = ALPHABET.indexOf(plainChar);
			char ch = cryptoKey.charAt(index);
			cipheredText += ch;
                }
		return cipheredText;
	}
        
    
    public static void main(String[] args) {
                MonoAlphabeticCipher mac = new MonoAlphabeticCipher();
                String key = "goodboy", plainText = "alishaikh";
                String cipheredText = mac.getCipheredText(plainText, key);
                System.out.println(ALPHABET.toUpperCase());
                System.out.println("cryptoKey: "+cryptoKey+" : "+cryptoKey.length());
                System.out.println("Key: "+key);
                System.out.println("plainText: "+plainText);
                System.out.println("ciphereText: "+cipheredText);
    }
}