Java 8 .stream() improvements over Java 7 methods.

// Java 7
public List<Alliance> getAlliances(int id) {
    final List<Alliance> alliances = new ArrayList<>();
    for (Alliance alliance : allianceList) {
        if (alliance.getClanA() == id || alliance.getClanB() == id) {
            alliances.add(alliance);
        }
    }
    return alliances;
}


// Java 8
public List<Alliance> getAlliances(int id) {
    return allianceList.stream().filter(alliance -> alliance.getClanA() == id || alliance.getClanB() == id).collect(Collectors.toList());
}