Changing the parameter of a java method

Question

I am developing a code that uses ECC encryption. I am using the following code:

import java.security.*;
import java.security.spec.*;

public class Teste {
 public static void main(String[] args) {
            KeyPairGenerator kpg;
            kpg = KeyPairGenerator.getInstance("EC","SunEC");
            ECGenParameterSpec ecsp;
            ecsp = new ECGenParameterSpec("secp256r1");
            kpg.initialize(ecsp);
            KeyPair kp = kpg.genKeyPair();
            PrivateKey privKey = kp.getPrivate();
            PublicKey pubKey = kp.getPublic();
            System.out.println(pubKey.toString());
  }
}

The output shown on the console is as follows:

Sun EC public key, 256 bits
  public x coord: 4615855875618351712635877256976103420366861757278971514413945892411643339267
  public y coord: 86295372175394984599678936024544037153778609141128039300731169643337680519305

I tried to change some things in the code but saw that this print model must come from some specific method (KeyPairGenerator.getInstance("EC","SunEC"); or new ECGenParameterSpec("secp256r1");).

How do I access this method and change the print to show only the numbers and disregard the text shown? He wanted the data obtained with the method getPublic(); was in the format below:

4615855875618351712635877256976103420366861757278971514413945892411643339267
86295372175394984599678936024544037153778609141128039300731169643337680519305