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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.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		HashMap<Integer,Integer> intHashMap = new HashMap<Integer,Integer>();
  13. 		HashMap<String,Integer> stringHashMap = new HashMap<String,Integer>();
  14.  
  15. 		int iterations = 1000000;
  16.  
  17. 		//int
  18. 		long ti = System.currentTimeMillis();
  19. 		for(int i=0;i<iterations;i++)
  20. 		{
  21. 			intHashMap.put(Integer.valueOf(i),i); ///Integer.valueOf() used to offset the speed implications of String.valueOf()
  22. 		}
  23. 		System.out.println("int put:  " + (System.currentTimeMillis()-ti));
  24.  
  25. 		ti = System.currentTimeMillis();
  26. 		for(int i=0;i<iterations;i++)
  27. 		{
  28. 			intHashMap.get(Integer.valueOf(i));
  29. 		}
  30. 		System.out.println("int get:  " + (System.currentTimeMillis()-ti));
  31.  
  32. 		//String
  33. 		ti = System.currentTimeMillis();
  34. 		for(int i=0;i<iterations;i++)
  35. 		{
  36. 			stringHashMap.put(String.valueOf(i),i);
  37. 		}
  38. 		System.out.println("string put:  " + (System.currentTimeMillis()-ti));
  39.  
  40. 		ti = System.currentTimeMillis();
  41. 		for(int i=0;i<iterations;i++)
  42. 		{
  43. 			stringHashMap.get(String.valueOf(i));
  44. 		}
  45. 		System.out.println("string get:  " + (System.currentTimeMillis()-ti));
  46.  
  47. 		intHashMap.clear();
  48. 		stringHashMap.clear();
  49. 		HashMap<String,Integer> stringHashMap2 = new HashMap<String,Integer>();
  50. 		HashMap<Integer,Integer> intHashMap2 = new HashMap<Integer,Integer>();
  51.  
  52.  
  53. 		//String
  54. 		ti = System.currentTimeMillis();
  55. 		for(int i=0;i<iterations;i++)
  56. 		{
  57. 			stringHashMap2.put(String.valueOf(i),i);
  58. 		}
  59. 		System.out.println("string put:  " + (System.currentTimeMillis()-ti));
  60.  
  61. 		ti = System.currentTimeMillis();
  62. 		for(int i=0;i<iterations;i++)
  63. 		{
  64. 			stringHashMap2.get(String.valueOf(i));
  65. 		}
  66. 		System.out.println("string get:  " + (System.currentTimeMillis()-ti));
  67.  
  68. 		//int
  69. 		ti = System.currentTimeMillis();
  70. 		for(int i=0;i<iterations;i++)
  71. 		{
  72. 			intHashMap2.put(Integer.valueOf(i),i);
  73. 		}
  74. 		System.out.println("int put:  " + (System.currentTimeMillis()-ti));
  75.  
  76. 		ti = System.currentTimeMillis();
  77. 		for(int i=0;i<iterations;i++)
  78. 		{
  79. 			intHashMap2.get(Integer.valueOf(i));
  80. 		}
  81. 		System.out.println("int get:  " + (System.currentTimeMillis()-ti));
  82.  
  83. 	}
  84. }
Success #stdin #stdout 4.54s 380352KB
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stdin
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Standard input is empty
stdout
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int put:  566
int get:  411
string put:  1277
string get:  604
string put:  624
string get:  557
int put:  358
int get:  67
https://ideone.com/42Qtn7
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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