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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.lang.reflect.Field;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		HashMap<Integer, Integer> map = new HashMap<Integer, Integer>(20, 500);
  14. 		Field tableField = HashMap.class.getDeclaredField("table");
  15. 		tableField.setAccessible(true);
  16. 		int prevLength = ((Object[]) tableField.get(map)).length;
  17. 		System.out.println(map.size() + " " + prevLength);
  18. 		for (int i = 0; i < 130000; i++) {
  19. 			map.put(i, i);
  20. 			Object[] table = (Object[]) tableField.get(map);
  21. 			if (table.length != prevLength) {
  22. 				System.out.println(map.size() + " " + table.length);
  23. 				prevLength = table.length;
  24. 			}
  25. 		}
  26. 	}
  27. }
Success #stdin #stdout 2.63s 380352KB
comments (?)
stdin 
Standard input is empty
stdout 
0 32
16001 64
32001 128
64001 256
128001 512
https://ideone.com/9QLEOH
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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