key generator of java security

KeyTest.java

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class KeyTest {

    public static void main(String[] args) {
        try {
            generateKeyPair();
            generateKey();
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    public static void generateKeyPair() throws NoSuchAlgorithmException, InvalidKeySpecException {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
        kpg.initialize(512);
        KeyPair kp = kpg.generateKeyPair();
        System.out.println(kpg.getProvider());
        System.out.println(kpg.getAlgorithm());
        KeyFactory kf = KeyFactory.getInstance("DSA");
        DSAPrivateKeySpec dsaPKS = kf.getKeySpec(kp.getPrivate(), DSAPrivateKeySpec.class);
        System.out.println("\tDSA param G:" + dsaPKS.getG());
        System.out.println("\tDSA param P:" + dsaPKS.getP());
        System.out.println("\tDSA param Q:" + dsaPKS.getQ());
        System.out.println("\tDSA param X:" + dsaPKS.getX());
    }

    public static void generateKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
        KeyGenerator kg = KeyGenerator.getInstance("DES");
        SecretKey key = kg.generateKey();
        System.out.println(kg.getProvider());
        System.out.println(kg.getAlgorithm());
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
        DESKeySpec desKS = (DESKeySpec) skf.getKeySpec(key, DESKeySpec.class);
        System.out.println("\tDES key bytes size:" + desKS.getKey().length);
    }

}