Given the Partial LinkedList Class Declaration Below, Select an Expression

question 73

Multiple Choice

Given the partial LinkedList class declaration below, select an expression to complete the empty method, which is designed to return true if the list contains no elements. public class LinkedList
{
Class Node
{
Public Object data;
Public Node next;
}
Private Node first;
) . .
Public boolean empty()
{
Return ________________________ ;
}
}

• A) first != null
• B) first == null
• C) first.data == null
• D) first.next == null

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Definitions:

Testable Hypotheses

A proposition that can be experimentally evaluated to determine its validity.

Existing Theory

An established set of ideas or principles aimed at explaining facts or phenomena, already supported by a significant amount of empirical evidence.

Subsequent Research

The studies or investigations conducted after a preliminary study to further explore a subject or hypothesis.

Replicated

The process of conducting a research study again to verify its results and ensure reliability and validity.