import com.diego_hernando.bitStamp_java_lib.BitStampAPI;
...
BitStampApi api=new BitStampAPI();
api.setId("id");
api.setKey("key");
api.setSecret("secret");

import com.diego_hernando.bitStamp_java_lib.BitStampCurrencyPairs;
...

//Get the balance of ETH and EUR from your account.
String ethEurBalance=api.getBalance(BitStampCurrencyPairs.ETHEUR);

//Get all transactions that you have done in BitStamp.
String transactions=api.getMyTransactions();

//Get your open orders in BitStamp.
String openOrders=api.getOpenOrders();

import com.diego_hernando.bitStamp_java_lib.BitStampCurrencyPairs;
import com.diego_hernando.bitStamp_java_lib.ApiWebsocketTransactions;
import com.diego_hernando.bitStamp_java_lib.WebsocketErrorListener;
import com.diego_hernando.bitStamp_java_lib.WebsocketTradeDoneListener;
...

//Implementation of listener for errors produced in websocket.
WebsocketErrorListener wbErrListener=new WebsocketErrorListener() {

	@Override
	public void onError(String error, String errorCode, ApiWebsocketTransactions webSocket) {
		//Your code

	}
};

//Implementation of listener for transactions, that are received by websocket.
WebsocketTradeDoneListener wbTradeDoneListener=new WebsocketTradeDoneListener() {

	@Override
	public void onTradeDone(String jsonTrade, BitStampCurrencyPairs tradingPair) {
		//Your code
	}
};

ApiWebsocketTransactions wbs=new BitStampAPI().getWebSocketOfTransactions(wbErrListener,wbTradeDoneListener);

//The method openChannel, only opens a chanel to receive data of the BitStamp currency pair passed by argument.
wbs.openChannel(BitStampCurrencyPairs.ETHEUR);
//The method openAllChannels opens chanels to receive data of all BitStamp currency pairs.
//wbs.openAllChannels();

//Connect websocket
wbs.connect();
....

//Disconnect websocket
wbs.disconnect();