Alternative Method using addAll() Method
addAll() Method is used with the collection to add the elements in the Collection container.
Below is the implementation of the Program to convert List of lists to HashSet in Java using addAll() Method:
Java
// Java Program to Convert Lists of Lists // to HashSet using addAll() Method import java.util.*; // Driver Class public class Main { // Main Function public static void main(String[] args) { List<List<Integer> > listOfLists = new ArrayList<>(); // Populate the list of lists listOfLists.add(Arrays.asList( 11 , 21 , 31 )); listOfLists.add(Arrays.asList( 40 , 50 )); // Duplicate listOfLists.add(Arrays.asList( 11 , 21 , 31 )); // Create a HashSet Set<List<Integer> > hashSet = new HashSet<>(); // Add all elements from the list of lists to // HashSet hashSet.addAll(listOfLists); // Print the HashSet System.out.println( "HashSet: " + hashSet); } } |
HashSet: [[11, 21, 31], [40, 50]]
How to Convert List of Lists to HashSet in Java?
In Java, Collections like lists, and sets play a crucial role in converting and manipulating the data efficiently. The Conversion of a List of Lists into a HashSet is mainly used to Remove Duplicates and ensures the programmer maintains the unique data of elements.
Example to Convert List of Lists to HashSet
Input: ListofList = [ [ 1,2,3 ] ,
[ 4,5 ] ,
[ 1,2,3 ] ]
Output: HashSet = [ [ 1,2,3 ] ,
[ 4,5 ] ]