Enthuware

So, in conclusion, is it because
1. the class Logger already imported java.util.ArrayList that
2. calling ArrayList methods on a Logger instance does not need TestClass to import java.util.ArrayList?
3. Unless TestClass creates a new instance of ArrayList?, such as

>>2. calling ArrayList methods on a Logger instance does not need TestClass to import java.util.ArrayList?
You can't call ArrayList methods on a Logger instance! Logger is not an ArrayList. If you mean, calling methods of Logger instance that return ArrayList, does not require ArrayList to be imported.

Bottom line is, if you use the word ArrayList in a class, then that class needs to import ArrayList (or the package java.util) for the compiler to understand what you mean by it.