Mega Code Archive

 

Categories / Java / Collections Data Structure

 

Copy all the elements from set2 to set1 (set1 += set2), set1 becomes the union of set1 and set2

import java.util.HashSet; import java.util.Set; public class Main {   public static void main(String[] argv) throws Exception {     Set set1 = new HashSet();     Set set2 = new HashSet();     set1.addAll(set2);   } }