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Author: theagentd (posted 2017-03-24 15:32:08, viewed 1888 times)

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import java.util.EnumMap;
import java.util.HashMap;
import java.util.Random;

public class EnumMappingTest {
   
   public static int totalSum = 0;
   
   public static void main(String[] args) {
      
      MyEnum[] enums = new MyEnum[1024*1024];
      
      MyEnum[] values = MyEnum.values();
      Random r = new Random(8475938476938673L);
      
      for(int i = 0; i < enums.length; i++){
         enums[i] = values[r.nextInt(values.length)];
      }

      long hashMapTime = 0;
      long enumMapTime = 0;
      long arrayTime = 0;
      long fieldTime = 0;
      
      long iterations = 0;

      HashMap<MyEnum, Integer> enumHashMap = new HashMap<>();
      EnumMap<MyEnum, Integer> enumEnumMap = new EnumMap<>(MyEnum.class);
      int[] enumArray = new int[values.length];
      for(MyEnum e : values){
         enumHashMap.put(e, e.constant);
         enumEnumMap.put(e, e.constant);
         enumArray[e.ordinal()] = e.constant;
      }
      
      
      while(true){

         hashMapTime += testHashMap(enumHashMap, enums);
         enumMapTime += testEnumMap(enumEnumMap, enums);
         arrayTime += testArray(enumArray, enums);
         fieldTime += testField(enums);
         
         iterations++;
         
         if(iterations % 100 == 0){
            System.out.println();
            System.out.println("HashMap: " + hashMapTime / iterations / 1000_000.0 + " ms");
            System.out.println("EnumMap: " + enumMapTime / iterations / 1000_000.0 + " ms");
            System.out.println("Array:   " + arrayTime / iterations / 1000_000.0 + " ms");
            System.out.println("Field:   " + fieldTime / iterations / 1000_000.0 + " ms");
            
         }
      }
      
      
   }

   private static long testHashMap(HashMap<MyEnum, Integer> hashMap, MyEnum[] enums) {
      
      long startTime = System.nanoTime();
      
      int sum = 0;
      for(int i = 0; i < enums.length; i++){
         sum += hashMap.get(enums[i]);
      }
      
      totalSum += sum;
      
      return System.nanoTime() - startTime;
   }

   private static long testEnumMap(EnumMap<MyEnum, Integer> enumMap, MyEnum[] enums) {
      
      long startTime = System.nanoTime();
      
      int sum = 0;
      for(int i = 0; i < enums.length; i++){
         sum += enumMap.get(enums[i]);
      }
      
      totalSum += sum;
      
      return System.nanoTime() - startTime;
   }
   
   private static long testArray(int[] enumArray, MyEnum[] enums) {
      long startTime = System.nanoTime();
      
      int sum = 0;
      for(int i = 0; i < enums.length; i++){
         sum += enumArray[enums[i].ordinal()];
      }
      
      totalSum += sum;
      
      return System.nanoTime() - startTime;
   }
   
   private static long testField(MyEnum[] enums) {
      long startTime = System.nanoTime();
      
      int sum = 0;
      for(int i = 0; i < enums.length; i++){
         sum += enums[i].constant;
      }
      
      totalSum += sum;
      
      return System.nanoTime() - startTime;
   }

   private enum MyEnum{
      
      A(1), B(2), C(3), D(4), E(5), F(6), G(7), H(8), I(9), J(10);
      
      int constant;
      
      private MyEnum(int constant) {
         this.constant = constant;
      }
   }
}





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