In this article, we will learn how to insert an element at a specific index in a Java list. For example, we have a fruit list by certain order and we want to insert a new fruit at a specific index in the list. Following are the ways to insert an element at a specific index in a Java list: Using add() Method Using ListIterator Using Stream API Using add() Method The add() method of the the list interface helps us to insert an element at ... Read More

In this article, we will learn how to insert all elements from one list into another in Java. This is a general operation we perform when working with lists while solving problems in Java. We will cover the following methods to insert all elements from one list into another: Using addAll() Method Using For Loop Using Stream API Using ListIterator Using addAll() Method We can add all elements of one list into another list easily using its addAll() method. This method appends all of the elements in the specified collection to the end of this list, in the ... Read More

List Interface is a collection in Java that is used for storing elements in a sequence. It also allows us to save duplicates as well as null values. In this article, we will learn how to empty a list in Java. Following are the ways to empty a list in Java: Using clear() Method Using removeAll() Method Using clear() Method The clear() method of the List interface is used to remove all elements from the list. It removes all the elements but returns nothing. Following is the syntax of the ... Read More

SolutionWe can add element to an array list easily using its add() method.Syntaxboolean add(E e)Appends the specified element to the end of this list.Type ParameterE  − The runtime type of the element to be added.Parameterse  − Element to be appended to this listReturnsIt returns true.ThrowsUnsupportedOperationException  − If the add operation is not supported by this listClassCastException  − If the class of the specified element prevents it from being added to this listNullPointerException  − If the specified element is null and this list does not permit null elementsIllegalArgumentException  − If some property of this element prevents it from being added to ... Read More

In this article, we will understand how to convert the array into a collection in Java. The Collection is a framework that provides an architecture to store and manipulate the group of objects. Java Collections can achieve all the operations that you perform on data such as searching, sorting, insertion, manipulation, and deletion. Problem Statement Write a program in Java to convert the array into the collection. Below is a demonstration of the same − Input Input array: [Java, Python, Scala, Shell] Output After elements after converting the array to a list ... Read More

A string is a class in Java that stores a series of characters enclosed within double quotes, and a continuous sequence of characters within that string is known as a substring. Those characters are string-type objects. In this article, we will learn how to write Java programs to check if a string contains a substring or not.  Java Program to Check if a String Contains a Substring We can check whether the given string contains a substring or not in the following ways: Using indexOf() Method Using contains() Method ... Read More

LinkedList is a generic class of Java Collection Framework that implements three interfaces namely List, Deque, and Queue. It provides the features of a LinkedList data structure which is a linear data structure where each element are linked with each other. There are several operations we can perform on LinkedList including appending, removing and traversing of elements. To add elements to a LinkedList Collection we can use various built-in methods such as add(), addFirst() and addLast(). We are going to explore how we can use these methods to add elements to a LinkedList. Adding elements to a LinkedList in Java ... Read More

A string is a class of 'java.lang' package that stores a series of characters. Those characters are actually String-type objects. We must enclose the value of string within double quotes. Generally, we can represent characters in lowercase and uppercase in Java. And, it is also possible to convert lowercase characters into uppercase. This article aims to discuss a Java program to convert the first character of each word into uppercase in a string. Java program to Capitalize the first character of each word in a String Before making a Java program to convert the first lowercase character of a ... Read More

In this article, we will understand how to print X star pattern using Java. The pattern is formed by using multiple for-loops and print statements. The pattern forms the shape of the letter "X" by printing stars ('X') and spaces in specific positions. The user can provide a number as input, which will determine the size of the pattern. The program uses nested loops to create the required star pattern, where stars are placed at the diagonal positions of a grid. Problem Statement Write a program in Java to print X star pattern. Below is a demonstration of the same: ... Read More

In this article, we will understand how to print half diamond star pattern. The pattern is formed by using multiple for-loops and print statements.Below is a demonstration of the same −InputSuppose our input is −Enter the number of rows : 8OutputThe desired output would be −The half diamond pattern : * ** *** **** ***** ****** ******* ******** ******* ****** ***** **** *** ** *AlgorithmStep 1 - START Step 2 - Declare three integer values namely i, j and my_input Step 3 - Read the required values from the user/ define the values Step 4 - We iterate through two ... Read More