Iancoleman Example

IancolemanExample.java

import com.google.common.collect.ImmutableList;
import java.util.Date;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.params.TestNet3Params;
import org.bitcoinj.crypto.ChildNumber;
import org.bitcoinj.crypto.DeterministicKey;
import org.bitcoinj.wallet.DeterministicKeyChain;
import org.bitcoinj.wallet.DeterministicSeed;
import org.bitcoinj.wallet.Wallet;

public class IancolemanExample {

    public static void main(String[] args) throws Exception {
        System.out.println("IancolemanExample");
        final NetworkParameters params = TestNet3Params.get();
        String mnemonic = "brisk wood symptom party betray ozone dad super beyond sea memory power pig business extra";

        // mnemonic seed
        DeterministicSeed seed = new DeterministicSeed(mnemonic, null, "", new Date().getTime());
        // new wallet with mnemonic seed
        Wallet wallet = Wallet.fromSeed(params, seed);
        System.out.println(wallet);
        DeterministicKeyChain keyChain = DeterministicKeyChain.builder().seed(seed).build();
        // Derive 100 children 
        keyChain.maybeLookAhead();

        int i = 0;
        while (i < 100) {

            DeterministicKey key5 = keyChain.getKeyByPath(ImmutableList.of(ChildNumber.ZERO_HARDENED, ChildNumber.ZERO, new ChildNumber(i)), false);
            System.out.print(key5.getPathAsString()  + " ");
            System.out.print(key5.toAddress(params).toString() + " ");
            System.out.print(key5.getPublicKeyAsHex() + " ");
            System.out.print(key5.getPrivateKeyAsWiF(params));
            System.out.print("\n");
            i++;
        }

    }
}

https://iancoleman.io/bip39/

Copy yours nnemonic seed 15 words, in the input BIP39 Mnemonic like "brisk wood symptom party betray ozone dad super beyond sea memory power pig business extra"
In Coin Select BTC- Bitcoin Testnet
In Derivation Path select the Tab BIP32
In Client select MultiBitHD

public static void main(String[] args) {
	// obscure loan stove case penalty coyote easy fluid employ patrol peanut during
	// embrace now coast
	NetworkParameters params = NetworkParameters.fromID(NetworkParameters.ID_MAINNET);

	String xPub = "xpub6CLGfh7bEzvPxdivQD7RxSXJgk7wGQCSosWSrsiDr2jVimmoHwYU3yTKYEdraX82WHHVcJjk8L7ptb9NCb5bs2XrrnWsLeyr5FscqFqXJct";

	Wallet wallet = Wallet.fromWatchingKeyB58(params, xPub, DeterministicHierarchy.BIP32_STANDARDISATION_TIME_SECS);

	System.out.println("Receiving Address : " + wallet.currentReceiveAddress());

	for (int i = 0; i < 10; i++) {
		System.out.println(i + " : " + wallet.freshReceiveAddress());
	}

}