Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Mastering Java: The Ultimate Quiz for 'Thinking in Java'. Dive deep into Java with multiple-choice questions. Challenge yourself with quiz questions designed to test and improve your understanding of the 'Thinking in Java' book. Get ready for your exam!

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What is the syntax to declare an ArrayList intended to hold String objects in Java using generics?

  1. ArrayList<String> list = new ArrayList<>();

  2. ArrayList list = new ArrayList<String>();

  3. ArrayList[String] list = new ArrayList();

  4. List<String> list = new ArrayList<String>();

The correct answer is: ArrayList<String> list = new ArrayList<>();

The syntax to declare an ArrayList intended to hold String objects in Java using generics is to use the keyword "ArrayList" followed by the generic type "<String>", and then assign it to a new ArrayList object using the constructor "()". Option A is the correct syntax and is the most efficient and recommended way to declare an ArrayList with generics. Option B may compile, but it does not use the proper syntax for generics and can result in warnings. Option C is not valid syntax for generics in Java. Option D is also valid syntax, but it uses a more general type "List" instead of the specific type "ArrayList", which may not be desired.

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