Collections Data Structure Java

  1. Home
  2. Java
  3. Collections Data Structure
  4. 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);
  }
}