Add element to hash set

ReturnMethodSummary
booleanadd(E e)Adds the specified element to this set if it is not already present.

  import java.util.HashSet;

public class Main{
    public static void main(String args[]) {
        HashSet<String> hs = new HashSet<String>();

        hs.add("java2s.com");
        hs.add("A");
        hs.add("D");
        hs.add("E");
        hs.add("C");
        hs.add("j a v a2s.com");

        System.out.println(hs);
    }
}

The output:


[D, E, j a v a2s.com, A, java2s.com, C]
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