![]() So the Set size must be 4 in each method. The list contains 7 items, but only 4 unique items. Let us begin with creating a List instance, and then we will convert it to the Set. ![]() We might need to create a HashSet from a specified ArrayList when we want to remove duplicates from the list because sets do not allow duplicate items. Using Streamįirst, convert the Set to Stream, and then collect the Stream elements to List. ArrayList arrayList = new ArrayList() Īssertions.assertEquals(3, arrayList.size()) 1.3. Using List.addAll()Īnother useful method to get a List with Set elements is to create an empty list instance and use its addAll() method to add all the elements of the Set to List. ArrayList arrayList = new ArrayList(set) Īssertions.assertEquals(3, arrayList.size()) 1.2. It will copy all elements from HashSet to the newly created ArrayList. To convert a given Set to a List, we can use the ArrayList constructor and pass HashSet as the constructor argument. We will be using the following Set to List type in different ways. Also, learn to reverse convert List to Set, a useful method to remove duplicate elements from a list. In this Java tutorial, Learn to convert a specified Set to a List. Both collection types are quite different and have their own usecases. List allows duplicate elements, but Set contains only unique elements. List is an index-based ordered collection, and Set is an unordered collection. In Java, List and Set are Collections types to store elements.
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