What does the List interface add to the collection concept?
Table of Contents
- 1 What does the List interface add to the collection concept?
- 2 Why We Use List interface What are main classes implementing List interface?
- 3 Why do we need collection framework in Java?
- 4 What is the difference between a linked list and an array list How are they similar?
- 5 What is the difference between comparable and comparable?
- 6 Is List ordered collection?
What does the List interface add to the collection concept?
The List interface extends Collection and declares the behavior of a collection that stores a sequence of elements. Elements can be inserted or accessed by their position in the list, using a zero-based index. A list may contain duplicate elements.
Why We Use List interface What are main classes implementing List interface?
The List interface provides a way to store the ordered collection. It is a child interface of Collection. It is an ordered collection of objects in which duplicate values can be stored. Since List preserves the insertion order, it allows positional access and insertion of elements.
What is collection class in Java List down its methods and interfaces?
Java Collection means a single unit of objects. Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet).
Which of the following methods are declared in List interface?
Interface java. util. List
| Method Summary | |
|---|---|
| void | add(int index, Object element) Inserts the specified element at the specified position in this List (optional operation). |
| boolean | isEmpty() Returns true if this List contains no elements. |
| Iterator | iterator() Returns an Iterator over the elements in this List in proper sequence. |
Why do we need collection framework in Java?
Java Collection Framework enables the user to perform various data manipulation operations like storing data, searching, sorting, insertion, deletion, and updating of data on the group of elements.
What is the difference between a linked list and an array list How are they similar?
LinkedList and ArrayList are two different implementations of the List interface. LinkedList implements it with a doubly-linked list. ArrayList implements it with a dynamically re-sizing array. As with standard linked list and array operations, the various methods will have different algorithmic runtimes.
Which package contains all classes and interfaces related to collection?
java.util
The utility package, (java. util) contains all the classes and interfaces that are required by the collection framework.
What is the difference between List and Set interface?
The set interface in the java. util package and extends Collection interface is an unordered collection of objects in which duplicate values cannot be stored….Difference between List and Set:
| List | Set |
|---|---|
| 1. The List is an ordered sequence. | 1. The Set is an unordered sequence. |
| 2. List allows duplicate elements | 2. Set doesn’t allow duplicate elements. |
What is the difference between comparable and comparable?
Comparable and Comparator both are interfaces and can be used to sort collection elements. However, there are many differences between Comparable and Comparator interfaces that are given below….Difference between Comparable and Comparator.
| Comparable | Comparator |
|---|---|
| 4) Comparable is present in java.lang package. | A Comparator is present in the java.util package. |
Is List ordered collection?
List Vs Set. 1) List is an ordered collection it maintains the insertion order, which means upon displaying the list content it will display the elements in the same order in which they got inserted into the list. Set is an unordered collection, it doesn’t maintain any order.