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  1.  
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class MyBasicHashSet {
  8.  
  9.     public static void main(String a[]){
  10.         HashSet<String> hs = new HashSet<String>();
  11.         //add elements to HashSet
  12.         hs.add("first");
  13.         hs.add("second");
  14.         hs.add("third");
  15.         System.out.println(hs);
  16.         System.out.println("Is HashSet empty? "+hs.isEmpty());
  17.         hs.remove("third");
  18.         System.out.println(hs);
  19.         System.out.println("Size of the HashSet: "+hs.size());
  20.         System.out.println("Does HashSet contains first element? "+hs.contains("first"));
  21.     }
  22. }
Success #stdin #stdout 0.05s 4386816KB
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stdin
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Standard input is empty
stdout
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[third, first, second]
Is HashSet empty? false
[first, second]
Size of the HashSet: 2
Does HashSet contains first element? true
https://ideone.com/Rt1X7Y
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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