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// collections/SetOperations.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

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");

System.out.println("H: " + set1.contains("H"));

System.out.println("N: " + set1.contains("N"));

Set<String> set2 = new HashSet<>();

Collections.addAll(set2, "H I J K L".split(" "));

System.out.println(

"set2 in set1: " + set1.containsAll(set2));

set1.remove("H");

System.out.println("set1: " + set1);

System.out.println(

"set2 in set1: " + set1.containsAll(set2));

set1.removeAll(set2);

System.out.println(

"set2 removed from set1: " + set1);

Collections.addAll(set1, "X Y Z".split(" "));

System.out.println(

"'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]

*/