Collections Java Tutorial

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  4. Remove all the elements in set1 from set2 (set1 -= set2), set1 becomes the asymmetric difference 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.removeAll(set2);
  }
}