Select the correct answerWhich of these is not abstract?OptionsAbstractListThreadListNone of the Mentioned

Breakdown the Problem

1. Identify the question being asked regarding abstract concepts in programming or data structures.
2. Analyze the provided options to determine their nature related to abstraction.

Relevant Concepts

1. Abstract: In programming, an abstract concept typically refers to something that is a broader concept without specific implementation details (e.g., abstract classes, interfaces).
2. List Types:
   • AbstractList: This is an abstract class in Java that provides a skeletal implementation of the List interface.
   • Thread: This is a concrete class that represents a thread of execution in a program.
   • List: This can refer to the List interface, which can be abstract depending on its implementation.

Analysis and Detail

1. AbstractList clearly qualifies as abstract since it is a class designed to be subclassed.
2. Thread represents a specific implementation and is not an abstract concept.
3. List as an interface can also be considered abstract but may have various concrete implementations.

Verify and Summarize

• The question asks for the option that is not abstract. Evaluating all options, "Thread" stands out as the only concrete class.

Final Answer

The correct answer is Thread.