OnJava8-Examples/containers/SetOperations.java

// containers/SetOperations.java
// <20>2015 MindView LLC: see Copyright.txt
import java.util.*;
import static com.mindviewinc.util.Print.*;

public class SetOperations {
  public static void main(String[] args) {
    Set<String> set1 = new HashSet<>();
    Collections.addAll(set1,
      "A B C D E F G H I J K L".split(" "));
    set1.add("M");
    print("H: " + set1.contains("H"));
    print("N: " + set1.contains("N"));
    Set<String> set2 = new HashSet<>();
    Collections.addAll(set2, "H I J K L".split(" "));
    print("set2 in set1: " + set1.containsAll(set2));
    set1.remove("H");
    print("set1: " + set1);
    print("set2 in set1: " + set1.containsAll(set2));
    set1.removeAll(set2);
    print("set2 removed from set1: " + set1);
    Collections.addAll(set1, "X Y Z".split(" "));
    print("'X Y Z' added to set1: " + set1);
  }
}
/* Output:
H: true
N: false
set2 in set1: true
set1: [A, B, C, D, E, F, G, I, J, K, L, M]
set2 in set1: false
set2 removed from set1: [A, B, C, D, E, F, G, M]
'X Y Z' added to set1: [A, B, C, D, E, F, G, M, X, Y, Z]
*/