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  1. import java.util.*;
  2. import java.io.*;
  3.  
  4. class Example {
  5.     public static void main(String[] args) throws IOException {
  6.         final int count = 1000;
  7.  
  8.         ArrayList<Boolean> list = new ArrayList<>(count);
  9.         list.addAll(Collections.nCopies(count, Boolean.TRUE));
  10.         System.out.printf("ArrayList: %d%n", sizeOf(list));
  11.  
  12.         boolean[] array = new boolean[count];
  13.         Arrays.fill(array, true);
  14.         System.out.printf("boolean[]: %d%n", sizeOf(array));
  15.  
  16.         BitSet bits = new BitSet(count);
  17.         bits.set(0, count);
  18.         System.out.printf("BitSet: %d%n", sizeOf(bits));
  19.     }
  20.  
  21.     static int sizeOf(Serializable obj) throws IOException {
  22.         ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
  23.         ObjectOutputStream objsOut = new ObjectOutputStream(bytesOut);
  24.         objsOut.writeObject(obj);
  25.         return bytesOut.toByteArray().length;
  26.     }
  27. }
Success #stdin #stdout 0.15s 320448KB
comments (?)
stdin 
Standard input is empty
stdout 
ArrayList: 5096
boolean[]: 1027
BitSet: 201
https://ideone.com/wt5qG6
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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