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  1.  
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7.  class Output {
  8.         public static void main(String args[]) {
  9.             HashSet obj = new HashSet();
  10.             obj.add(null);
  11.             obj.add("B");
  12.             obj.add("A");
  13.             obj.add("A");
  14.             obj.add(null);
  15.             obj.add("C");
  16.             obj.add(null);
  17.             System.out.println(obj+""+obj.size());
  18.         }
  19.     }
Success #stdin #stdout 0.04s 4386816KB
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Standard input is empty
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[null, A, B, C]4
https://ideone.com/bSTk39
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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