ArrayList Creation

In this chapter you will learn:

1. What are constructors for ArrayList

ArrayList Constructors

ArrayList has the constructors shown here:

• ArrayList( )
  builds an empty array list.
• ArrayList(Collection<? extends E> c)
  builds an array list that is initialized with the elements of the collection c.
• ArrayList(int capacity)
  builds an array list that has the specified initial capacity.

The capacity is the size of the underlying array that is used to store the elements. The capacity grows automatically as elements are added to an array list.

import java.util.ArrayList;
/*  java2s .  co m*/
public class Main {
  public static void main(String args[]) {
    ArrayList<String> al = new ArrayList<String>();

    System.out.println(al);
  }
}

The code above creates an ArrayList with its default constructor. After creation the ArrayList is empty.

Next chapter...

What you will learn in the next chapter:

1. How to add elements to an ArrayList

List

    List interface

    List add/insert elements

    List clear/remove elements

    List search

    List element get and set

    List and its Iterator

    List size, empty

    List conversion, to array

    List to sublist

    List comparison

    List filling

    List reversing

    List rotating and shuffling

    List sorting

    List element swap

    List element replacing

    List copy

    List binary search

ArrayList

    ArrayList

    ArrayList Creation

    ArrayList add/insert

    ArrayList get/set element

    ArrayList clear/remove

    ArrayList search

    ArrayList copy and shallow copy

    ArrayList size, trim to size and capacity

    ArrayList to array

LinkedList

    LinkedList class

    LinkedList creation

    LinkedList add/insert elements

    LinkedList get elements

    LinkedList search

    LinkeList replace/set elements

    LinkedList remove element

    LinkedList copy

    LinkedList iterator

    LinkedList peek element

    LinkedList pop/push element

    LinkedList conversion

List Utilities

    List filling

    List reversing

    List rotating and shuffling

    List sorting

    List element swap

    List element replacing

    List copy

    List binary search