The method syntax is as follows:īefore reversing: Īfter reversing: The approach considers inplace conversion which means that conversion takes place in the list itself which was passed as the argument. The reverse method takes the given list to reverse as a method parameter and returns the final reversed list as output. The class contains the reverse() method which can be used to reverse the order of the elements in the specified list. It is the most straightforward way to reverse a list in java. An inplace conversion means that the conversion should take place without using any auxiliary list, by overwriting the existing elements of the specified list. Note that a List reversal method can be categorized as either inplace or not inplace. ![]() Reversing a list is a conventional part of any programming language and therefore, let us discuss 7 explicit methods by which you can reverse a list in java efficiently. While programming in java, there might be a scenario where you wish to reverse the order of the list. This method adds a specified value at the specified location in the list. The syntax of the List_add() method is given below: Let's look at two methods of lists that we will be using throughout this article 1) List.add() So, in order to create its object, we have to use classes that implement this interface like ArrayList. ![]() A technical note here is that List is an interface in java. So technically we can define a list as a dynamic array. When we add an element to a list then its size increases by one and whenever we remove an element from a list its size decreases by one. However, this is not the case with lists. If we try to access or add any element beyond the size of an array then we get an exception. This change in the size of a list during runtime is called dynamic nature. List are essentially just like an array except their size can grow or shrink during the runtime. An array is a group of elements with similar data types stored in contiguous memory locations referenced under a single name. Till now we are familiar with the concept of arrays. Before diving into those methods, let us have a quick recap of lists and the methods that we will be discussing in this article. There are majorly 7 ways, using which we can reverse a list. Reversing a list means putting the first element of the list at the last position, the second element at the second last position and finally putting the last element at the first position. ![]() In this tutorial, we will learn how we can reverse a list in Java.
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