SymmetricApp class

package javaapplication1;
import java.security.*;
import javax.crypto.*;

public class SymmetricApp {
    public void demoEncryption(){
        try {
            String message = "Selamat datang Java";
            byte[] plainText = message.getBytes("UTF8");
            //get a DES private key
            System.out.print("Generating DES key...");
            KeyGenerator keyGen = KeyGenerator.getInstance("DES");
            keyGen.init(56);
            Key key = keyGen.generateKey();
            System.out.println("Done");
            //get a DES cipher object and print the provider
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
            //encypt using the key and the plaintext
            System.out.printf("Encryption...");
            cipher.init(Cipher.ENCRYPT_MODE,key);
            byte[] cipherText = cipher.doFinal(plainText);
            System.out.println("Done");
            // decrypt the ciphertext using the same key
            System.out.print ("Decryption...");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] newPlainText=cipher.doFinal(cipherText);
            System.out.println("Done");
            System.out.println("Message: "+message);
            System.out.println("Encrypted: "+new String(cipherText,"UTF8"));
            System.out.println("Encrypted Hex: "+StringUtils.getHexString(cipherText));
            System.out.println("Plaintex: "+new String (newPlainText,"UTF8"));
        }catch (Exception e){
            System.out.println("Error: "+e.getMessage());
        }
    }
    public static void main(String[] args) {
        SymmetricApp app=new SymmetricApp();
        app.demoEncryption();
    }
}