The bytes can be converted back to public and private key objects

    
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class Main {
  public static void main(String[] argv) throws Exception {
    String algorithm = "DSA"; // or RSA, DH, etc.

    // Generate a 1024-bit Digital Signature Algorithm (DSA) key pair
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance(algorithm);
    keyGen.initialize(1024);
    KeyPair keypair = keyGen.genKeyPair();
    PrivateKey privateKey = keypair.getPrivate();
    PublicKey publicKey = keypair.getPublic();

    byte[] privateKeyBytes = privateKey.getEncoded();
    byte[] publicKeyBytes = publicKey.getEncoded();
    
    KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
    EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
    PrivateKey privateKey2 = keyFactory.generatePrivate(privateKeySpec);

    EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyBytes);
    PublicKey publicKey2 = keyFactory.generatePublic(publicKeySpec);

    // The orginal and new keys are the same
    boolean same = privateKey.equals(privateKey2); 
    same = publicKey.equals(publicKey2); 
  }
}

1.	Using the KeyGenerator class and showing how to create a SecretKeySpec from an encoded key
2.	Key Generator Mac
3.	Generate DSA key pair
4.	KeyPair Generator For Private Key
5.	KeyPair Generator For Public Key
6.	Wrap And Unwrap Key
7.	Generating a Public/Private Key Pair
8.	Generate a 576-bit DH key pair
9.	Generate a 1024-bit RSA key pair
10.	Getting the Bytes of a Generated Key Pair
11.	Get the bytes of the public and private keys
12.	Generate a key for the HMAC-SHA1 keyed-hashing algorithm
13.	Asymmetric Key Maker
14.	Generating a Symmetric Key
15.	Xml dap Certs And Keys
16.	Diffie-Hellman key exchange

The bytes can be converted back to public and private key objects : Key Generator « Security « Java

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