// collections/SetOfInteger.java

// (c)2017 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 SetOfInteger {

public static void main(String[] args) {

Random rand = new Random(47);

Set<Integer> intset = new HashSet<>();

for(int i = 0; i < 10000; i++)

intset.add(rand.nextInt(30));

System.out.println(intset);

}

}

/* Output:

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29]

*/