void clear(): Makes the list completely empty by removing all elements.The elements at that location and subsequent locations are shifted to the right. void add(int index, E obj): Inserts an element at the specified index.boolean add(E obj): Inserts an element at the end of the list.A few of the commonly used are as follows: ArrayList(int initialCapacity): Constructs an empty list, but we can override the default initial capacity.ArrayList(Collection c): Constructs a list containing elements in a pre-specified collection.ArrayList(): Constructs an empty list with an initial storage capacity of ten elements.Java ArrayList class contains three constructors, such as: Common operations are add/remove elements in various ways, determine if the list is empty, obtain the size of the list indicated by number of elements present currently, and so forth. Here, the behavior is defined by the ready-made methods of the ArrayList class. Naturally, Java ArrayList also behaves in a similar manner. An array is nothing but a sequential collection same type of elements, accessed by their index values. Java ArrayList uses an array as the internal programming construct to store elements. Java ArrayList is one of them and can be used like the low-level arrays with some special connotation. Java Collection Framework contains many such prepackaged data structures, interfaces, and algorithms. Direct manipulation may be necessary on occasion, yet when productivity is concerned, support from the API library comes in quite handy. Creating each element of the data structure dynamically and modifying them by directly manipulating references to it can be erroneous and also daunting at times. While dealing with data structures in any programming language, we resort to low-level manipulation of data. Refer to the Java API Documentation for more details on the classification. Collection collection= new ArrayList().As a result, we can declare an ArrayList object as any of the ways that follow: In short, Java ArrayList is a subclass of AbstractList and implements the List interface, and List is an extension of the Collection interface. This article attempts to provide some information of this utility class with a brief overview of its structure. Java ArrayList is especially used for managing a large number of objects. On one hand, it behaves like a normal array, providing all the benefits of it and, on the other, it is a generic re-sizable collection implementation of the List interface. It is a part of the Java Collection Framework under the java.util package. Java ArrayList is perhaps the simplest and one of the most used data structure implementation classes of the Java API Library.
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