addAll(Collection c) method of List appends all the elements of the specified collection to the end of the List instance. The specified collection’s iterator defines the order of added elements. The behavior of this method is undefined if someone modifies the supplied collection during this operation. Syntax: Let’s look at Read more…
NullPointerException is something which every developer faces and it is difficult to find where the exception occurred. Java 14 made it really convenient for programmers to find the NullPointerException in the code. It adds a really good description specifying where the exception occurred along with the variable name. Let’s look Read more…
In this article we are going to look at how pattern matching for instanceof works in Java 14. In coding mostly we check for the type of the class and then cast our object to that specific type. Java 14 has made it really easy to do both the operations Read more…
In the majority of cases once a two dimensional array is created then the number of rows and columns remains the same, but sometimes you want it to be dynamic. Dynamic two dimensional array in Java is used to have varying numbers of rows where user can add or remove Read more…
In this article, we will see how to sort ArrayList elements in descending order using sort(List list, Collections.reverseOrder()) method. Examples: Input: 23, 54, 32, 56, 78, 65 Output: 78, 65, 56, 54, 32, 23 Input: Microsoft, Vmware, Salesforce, Apple, Facebook Output: Vmware, Salesforce, Microsoft, Facebook, Apple Example 1: Read more…
In this article, we will see how to sort ArrayList elements in ascending order using a Collections.sort(List list) method. Examples : Input: 23, 54, 32, 56, 78, 65 Output: 23, 32, 54, 56, 65, 78 Input: Microsoft, Vmware, Salesforce, Apple, Facebook Output: Apple, Facebook, Microsoft, Salesforce, Vmware Example 1: The Read more…
The user creates the ArrayList and does all sort of operations on the list. In most of the cases, it becomes essential to clear up some memory. ArrayList clear() method clears all the elements from the list and makes it empty. The performance of the clear() is excellent and time Read more…
ArrayList isEmpty() checks if the list is empty or not. If returns true if the list is empty else false it returns false. Syntax: This method doesn’t throw any exceptions. Let’s try to understand this diagrammatically understand isEmpty() behavior. Program to demonstrate ArrayList isEmpty() Let’s have a look at the Read more…
ArrayList removeAll() is used to remove all the elements contained in the specified collection from the list. It throws NullPointerException if the specified collection is null. Syntax: Parameter – c is the collection of elements to be removed from the list. Returns – true if the list changed as a Read more…
The remove() method of ArrayList removes the specified element from the list. We can also remove an element at a particular position using remove(int index). It throws IndexOutOfBoundsException if the index is out of range. Syntax: Parameters – o is the element to be removed. Returns – true on successful Read more…