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  1.  
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class MyHashSetRetain {
  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.         hs.add("apple");
  16.         hs.add("rat");
  17.         System.out.println(hs);
  18.         HashSet<String> subSet = new HashSet<String>();
  19.         subSet.add("rat");
  20.         subSet.add("second");
  21.         subSet.add("first");
  22.         hs.retainAll(subSet);
  23.         System.out.println("HashSet content:");
  24.         System.out.println(hs);
  25.     }
  26. }
Success #stdin #stdout 0.04s 4386816KB
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stdin
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Standard input is empty
stdout
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[apple, third, rat, first, second]
HashSet content:
[rat, first, second]
https://ideone.com/K23rUl
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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