![]() If we have one list list1 and another list2, we can join them with the help of addAll() like this: list1.addAll(list2) ġ2. List interface provides a method addAll() to join two or more lists in java. Is it possible to join two or more ArrayLists in Java?Īnswer: Yes, we can join two or more ArrayLists in java. Is it possible to add null into ArrayList?Īnswer: Yes, we can add any number of nulls into the array list.ġ1. ![]() Does ArrayList allow to insert duplicate elements?Īnswer: Yes, ArrayList allows to insert duplicate elements.ġ0. addAll(int index, Collection c): Inserts all of the elements of the specified collection into the list, starting at the specified position.ĩ.add(int index, E element): Inserts the specified element at the specified position in the list.add(E element): Appends the specified element to the end of the array list.How to add elements to Java ArrayList?Īnswer: List interface provides three useful methods to add elements into an ArrayList. How to create a generic ArrayList object in Java?Īnswer: The general syntax to create a generic ArrayList object is as follows: ArrayList arList = new ArrayList() // Here, T is a type parameter.Ĩ. When elements are removed from the array list, the size of array list can be shrunk automatically.ħ. If the initial capacity of the array is exceeded, a new array with a larger capacity is created automatically and all the elements from the current array are copied to the new array. Why is ArrayList called a dynamically growing array in Java?Īnswer: ArrayList is called a dynamically growing array in java because ArrayList uses a dynamic array internally for storing a group of elements. J) The performance of ArrayList is slow because if any element is removed from ArrayList, a lot of shifting takes place.Ħ. I) Since ArrayList implements random access interface, we can get, set, insert, and remove elements of the array list from any arbitrary position. That means multiple threads can use the same ArrayList objects simultaneously. G) ArrayList maintains the insertion order in Java. ![]() Once ArrayList is created, we can add any number of elements.Ĭ) An ArrayList allows adding elements into the middle of collection.Į) Duplicate elements are allowed in the array list.į) Any number of null elements can be added to ArrayList. What are the important features of ArrayList in Java?Īnswer: There are several significant features of ArrayList in Java that are as follows:Ī) ArrayList in Java uses an index-based structure.ī) The size of ArrayList can increase or decrease at runtime. Which collection classes implement List interface in Java?Īnswer: The collection classes that implement List interface, are as:ĥ. Which marker interfaces are implemented by Java ArrayList?Īnswer: Java ArrayList class implements three marker interfaces such as RandomAccess, Cloneable, and Serializable.Ĥ. Answer: Go to this tutorial: ArrayList in Java.ģ. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |