RSA Key ausgeben

[Lucaaa]

Hallo!
Ich habe eine Klasse die einen String per RSA verschlüsselt und wieder ausgibt.
Wie bekomme ich es hin, dass darunter dann der PrivatKey zum entschlüsseln ausgebenen wird.?
Hier der Code

import java.awt.RenderingHints.Key;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
public class RsaVerschlüsselung {
  static int keysize = 1024;
  private static KeyPair key = null;
  byte[] enc = null;
 public static void main(String[] arg) {
  gen();
  byte[] enc = encrypt("Hallo", key.getPublic());
  System.out.println(new String(enc));
 // String dec = decrypt(enc, key.getPrivate());
 // System.out.println(dec);
  String privatKey = key.getPrivate().toString();
  System.out.println(key.getPrivate());
 }
  
  
  
  
 public static void gen() {
  KeyPairGenerator keygen = null;
  
  try {
   keygen = KeyPairGenerator.getInstance("RSA");
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  }
  keygen.initialize(1024);
   key = keygen.generateKeyPair();
 }
 
 
 
 
 
 
 
 public static byte[] encrypt (String message, PublicKey pk) {
  Cipher cipher = null;
  try {
   cipher = Cipher.getInstance("RSA");
   cipher.init(Cipher.ENCRYPT_MODE, pk);
  } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
   e.printStackTrace();
  } catch (InvalidKeyException e) {
   e.printStackTrace();
  }
  byte[] chifrat = null;
  try {
   chifrat = cipher.doFinal(message.getBytes());
  } catch (IllegalBlockSizeException e) {
   e.printStackTrace();
  } catch (BadPaddingException e) {
   e.printStackTrace();
  }
  return chifrat;
 }
 
 
 public static String decrypt(byte[] chifrat, PrivateKey sk) {
  byte[] dec = null;
  
  Cipher cipher = null;
  try {
   cipher = Cipher.getInstance("RSA");
   cipher.init(Cipher.DECRYPT_MODE, sk);
  } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
   e.printStackTrace();
  } catch (InvalidKeyException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  try {
   dec = cipher.doFinal(chifrat);
  } catch (IllegalBlockSizeException | BadPaddingException e) {
   e.printStackTrace();
  }
  return new String(dec);
 }
 
}