Diffie-Hellman key exchange in Java

I am working on a personal project in Java which involves sending sensitive data over an insecure channel. I need to know how to implement Diffie Hellman Key Exchange (DHKE) in java using its libraries. I know all the cryptographic theory about it so no need to go into details, I just need a very basic implementation so I cand have 2 programs share a secret key. I got the example from java2s.com, but it is not complete: ``` import java.math.BigInteger; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.SecureRandom; import javax.crypto.spec.DHParameterSpec; import javax.crypto.spec.DHPublicKeySpec; public class Main { public final static int pValue = 47; public final static int gValue = 71; public final static int XaValue = 9; public final static int XbValue = 14; public static void main(String[] args) throws Exception { BigInteger p = new BigInteger(Integer.toString(pValue)); BigInteger g = new BigInteger(Integer.toString(gValue)); BigInteger Xa = new BigInteger(Integer.toString(XaValue)); BigInteger Xb = new BigInteger(Integer.toString(XbValue)); int bitLength = 512; // 512 bits SecureRandom rnd = new SecureRandom(); p = BigInteger.probablePrime(bitLength, rnd); g = BigInteger.probablePrime(bitLength, rnd); createSpecificKey(p, g); } public static void createSpecificKey(BigInteger p, BigInteger g) throws Exception { KeyPairGenerator kpg = KeyPairGenerator.getInstance("DiffieHellman"); DHParameterSpec param = new DHParameterSpec(p, g); kpg.initialize(param); KeyPair kp = kpg.generateKeyPair(); KeyFactory kfactory = KeyFactory.getInstance("DiffieHellman"); DHPublicKeySpec kspec = (DHPublicKeySpec) kfactory.getKeySpec(kp.getPublic(), DHPublicKeySpec.class); } } ``` How do I go on from this? Could anyone help me complete the remaining code?