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The List provides two methods to convert a List into Array.1. Use toArray() method without parameter.Object[] toArray()ReturnsAn array containing all of the elements in this list in proper sequence.2. Use toArray() with array. T[] toArray(T[] a)Parametersa − The array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.ReturnsAn array containing the elements of this list.ThrowsArrayStoreException − If the runtime type of the specified array is not a supertype of the runtime type of every element in this list.NullPointerException − If ... Read More
List provides a method size() to check the current size of the list.Syntaxint size()Returns the number of elements in this list. If this list contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.ReturnsThe number of elements in this list.ExampleThe following example shows how to get size of a list using size() method.package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { List list = new ArrayList(Arrays.asList(1, 2, 3, 4)); System.out.println("List: " + list); System.out.println("List Size: " + list.size()); list.add(5); ... Read More
List provides a method contains() to check if list contains that element or not. It utilizes equals() method so we need to override the equals() method in the element type.Syntaxboolean contains(Object o)Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).Parameterso − Element whose presence in this list is to be tested.ReturnsTrue if this list contains the specified element.ThrowsClassCastException − If the type of the specified element is incompatible with this list (optional).NullPointerException − If the specified element ... Read More
We can utilize Arrays.asList() method to get a List of specified elements in a single statement.Syntaxpublic static List asList(T... a)Returns a fixed-size list backed by the specified array. (Changes to the returned list "write through" to the array.)Type ParameterT − The runtime type of the array.Parametersa − The array by which the list will be backed.ReturnsA list view of the specified arrayIn case we use Arrays.asList() then we cannot add/remove elements from the list. So we use this list as an input to the ArrayList constructor to make sure that list is modifiable.ExampleThe following example shows how to create ... Read More
We can insert element between two items of an array list easily using its add() method.Syntaxvoid add(int index, E element)Inserts the specified element at the specified position in this list (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).Type ParameterE − The runtime type of the element.Parametersindex − Index at which the specified element is to be inserted.e − Element to be inserted to this list.ThrowsUnsupportedOperationException − If the add operation is not supported by this listClassCastException − If the class of the specified element prevents it ... Read More
Humans cry to express their emotional state which may be sadness, anger or joy. It’s a powerful nonverbal communication used by all ages of people to express their strong inner feelings. Shedding tears is common in almost every human being to express their emotions.There can be both positive and negative tears. Crying can be a result of profound joy or happiness, feeling blissful or ultimate contention or due to sadness or feeling helpless.People cry when they feel emotionally stressed or busted. Crying may not be always out of sadness or frustration or hopelessness, though. It’s a way of expressing the ... Read More
Your website is one of your business’s most important tools. It draws new customers; informs current customers; gives you a portal to effectively communicate with the world; and helps shape the image of both you and your business.Each hiccup in your website’s operation can cause you headaches and cost you money. To keep things running smoothly, take a look at the following common security breaches and how to defend against them.DDoSThis isn’t DOS with a stutter. DDoS stands for distributed denial of service. This is when a team of malicious computers gang up on your website to flood your website ... Read More
Nobody in the world, who does not require extra money in their hand without going anywhere and without investing anything?If you are artistic and self-confident about your skills and very much interested in googling, then making money online won’t be tough for you.Because of some reason, if your cash gets over and you need extra cash immediately, internet is an excellent resource to make money fast without going anywhere. Also, you get various options to work according to your skills and your own comfort.To earn money online; it is not required that you should be having your own website, own ... Read More
In daily life, web has become something for someone without that they can’t imagine their life. People who are web lover; at once they can live without feeding and using things which are important in everyday life, but they can’t live without using web or can’t breathe without it. It is available 24X7 with consistent care.To make your presence strong on web, it is not enough to just be online, only. No matter what business you are doing, there are too many competitors in this market who are trying hard to call Customers. To strengthen yourself on web, create a ... Read More
Virtual meetings offer a powerful way for students to collaborate, both for online classes and live lectures. When you don’t have the time or facilities to get together in person, these services will help you host an efficient group study session or meeting.Create Unlimited Groups with RcampusThis free site allows users to create and participate in an unlimited number of study groups for free. Each Rcampus group receives a home page and message center for easy sharing. The group’s creator or moderator is responsible for maintaining the home page and deciding who has access to the group. All messages and ... Read More