Get the intersection of set1 and set2, set1 becomes the intersection 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.retainAll(set2);

    // Remove all elements from a set
    set1.clear();

  }
}

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Get the intersection of set1 and set2, set1 becomes the intersection of set1 and set2 : Set « Collections Data Structure « Java

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