Jul 19, 2022 · There are four ways to convert ArrayList to HashSet : Using constructor. Using add () method by iterating over each element and adding it into the HashSet. Using addAll () …

May 26, 2016 · List<Integer> sourceList = new ArrayList(); sourceList.add(1); sourceList.add(2); sourceList.add(3); sourceList.add(4); // Using Core Java Set<Integer> set1 = new …

Jan 24, 2018 · Here's my code: List<String> list = new ArrayList<String>(); int totalWords = 0; int uniqueWords = 0; File fr = new File("filename.txt"); Scanner sc = new Scanner(fr); while …

Nov 15, 2021 · The ways to convert List to HashSet : Passing List Object as parameter in HashSet. Adding each element of List into HashSet using loop. Using addAll () Method of Set …

Feb 26, 2024 · ArrayList: In Java, ArrayList can have duplicates as well as maintains insertion order. HashSet: HashSet is the implementation class of Set. It does not allow duplicates and …

Jul 19, 2020 · HashSet implements the Set interface, backed by a hash table. Any implementation of Set simply discards the duplicate elements. Since both list1 and list2 are equal, set will …

Sep 23, 2022 · Here, we are using the addAll () method of HashSet class to convert ArrayList to HashSet. In this example, we have an ArrayList of Integer type and we are adding its elements …

Feb 2, 2024 · This tutorial will introduce different approaches to converting an ArrayList to a HashSet. Convert ArrayList to HashSet Using Naive Approach in Java. This is the most basic …

Jan 21, 2010 · Set set = new HashSet(list); Convert Set to List List list = new ArrayList(set); 1. List To Set Example import java.util.ArrayList; import java.util.HashSet; import java.util.List; import …

In this lab, you learned how to convert ArrayList to HashSet in Java using the HashSet constructor, add() method, and Stream API. By applying these techniques, you can easily get …