Steam4j is a Steam API binding library for the Java language.
1.0
At first it is necessary to acquire Steam Client to use steam4j. Api key can be generated http://steamcommunity.com/dev/apikey.
String apiKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
SteamConfiguration configuration = new SteamConfiguration(apiKey);
SteamClient steamClient = SteamFactory.getInstance(configuration).getClient();