public class TestService implements ITestService {

    @Override
    public Integer getTestValue() {
        return 42;
    }

    @Override
    public Integer getAnotherTestValue() {
        return 2;
    }

    @Override
    public Integer calculateAnswer() {
        Integer testValue = getTestValue();
        Integer anotherTestValue = getAnotherTestValue();

        return testValue * anotherTestValue;
    }
}