Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
4th Edition
ISBN: 9780134787961
Author: Tony Gaddis, Godfrey Muganda
Publisher: PEARSON
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Textbook Question
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Chapter 19, Problem 1MC

A list is a collection that _____.

  1. a. associates keys with elements
  2. b. assigns an index to each of its elements
  3. c. is implemented by the JList class
  4. d. none of the above
Expert Solution & Answer
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Program Description Answer

A list is a collection that “assigns an index to each element in a list”.

Hence, the correct answer is option “B”.

Explanation of Solution

List:

  • A list is a collection that stores its element in a location-based order.
  • Each element in a list is related with an index that matches to its location within the list. That is the first element contains index 0, the second element contains index 1 and so on.
  • Storage allocation for the elements of a list takes place in two methods such as contiguous allocation and linked allocation.
    • Continuous allocation:
      • Array-based lists use this allocation.
      • It assigns storage for consecutive list elements in consecutive memory locations.
    • Linked allocation:
      • This allocation does not require consecutive memory locations to store list elements.
      • It uses a pointer to store each element in a list.

Explanation for incorrect options:

A list is a collection that associates index with elements not keys.

Hence, the option “A” is wrong.

“JList” is a type of Java Swing package. It is a component that shows a set of objects and permits the user to choose more than one element from the list.

Hence, the option “C” is wrong.

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