![]() Access the second element of the ArrayList and print it to the console Create an ArrayList of integers from the HashSet This calls the constructor and from there onwards the constructor takes care of the rest.Ī.add(1) // Duplicate value, HashSet will only add it once The most straightforward way to convert a set to a list is by passing the set as an argument while creating the list. We are now going to look at codes and description for further understanding: Approach 1: Converting Set To List In Java Using the ArrayList constructor To create the List, pass the Set to the pyOf() method. ![]() The resulting List is unmodifiable and cannot be modified. Using pyOf() method: pyOf() is a Java 10 method that creates an immutable List from a Set.Using the conventional for loop : To convert a Set to a List using a conventional for loop in Java, you can create an empty List and iterate over the Set, adding each element to the List using the add() method.If you need to preserve the order, use a LinkedHashSet instead of a HashSet. ![]() We can create a stream of the Set, convert it to a List using the collect() method, and store the result in a new List. Using the Streams API: We can also use the Streams API introduced in Java 8 to convert a Set to a List.We can create a new ArrayList and then call the addAll() method with the Set as the argument to convert it to a List. Using the addAll() method of ArrayList: The ArrayList class has an addAll() method that can add all the elements of a Collection to the ArrayList.We can pass the Set to this constructor to convert it to a List. Using the ArrayList constructor: The ArrayList constructor can take a Collection as an argument, and it will create a new ArrayList containing the elements of the Collection.Here are some of the commonly used methods: There are different methods for converting a Set to a List in Java. Methods For Converting Set to List in Java For example, if we need to iterate over the elements of a collection multiple times, then it might be more efficient to convert a Set to a List and iterate over the List multiple times. Convenience: In some cases, it may be more convenient to work with a List rather than a Set.API compatibility: Some APIs or methods may only accept a List as input, and in such cases, we need to convert a Set to a List to make use of the API.Since a List allows duplicates, converting a Set to a List will allow us to have multiple occurrences of the same element. Duplicates: If we need to allow duplicates, then we can convert a Set to a List.Since a List maintains the order of elements, converting a Set to a List will ensure that the elements are in the order they were added to the Set. Ordered elements: If we need to maintain the order of elements, then we can convert a Set to a List.There are several reasons why we might need to convert a Set to a List in Java: ![]() On the other hand, a List is a collection that allows duplicates and maintains the order of elements. In Java, a Set is a collection that contains unique elements, meaning that it does not allow duplicates. Why conversion of Set to List in Java are required : This article will show you how to convert a Set to a List in Java. There are situations where it may be necessary to convert a Set to a List, for example, when you need to perform operations that are only supported by the List interface, such as accessing elements by their index. In Java, a Set is a collection that contains only unique elements, while a List is a collection that allows duplicates and maintains the insertion order of its elements. ![]()
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