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  1.  
  2. import java.util.*;
  3. import java.lang.*;
  4. import java.io.*;
  5.  
  6. public class Main {
  7.  
  8. 	private static int loop1(List<String> list) {
  9.         int charCount = 0;
  10.         for (int i = 0; i < list.size(); i++) {
  11.             charCount += list.get(i).length();
  12.         }
  13.         return charCount;
  14.     }
  15.  
  16.     private static int loop2(List<String> list) {
  17.         int charCount = 0;
  18.         int listCount = list.size();
  19.         for (int i = 0; i < listCount; i++) {
  20.             charCount += list.get(i).length();
  21.         }
  22.         return charCount;
  23.     }
  24.  
  25.     private static int loop3(List<String> list) {
  26.         int charCount = 0;
  27.         for (String s : list) {
  28.             charCount += s.length();
  29.         }
  30.         return charCount;
  31.     }
  32.  
  33.     public static void main(String[] args) {
  34.         ArrayList<String> ls = new ArrayList<String>();
  35.  
  36.         for (int j = 0; j < 1000000; j++) {
  37.             ls.add("one");
  38.             ls.add("two");
  39.             ls.add("three");
  40.             ls.add("four");
  41.             ls.add("five");
  42.         }
  43.  
  44.         long startTime1 = System.nanoTime();
  45.         int count1 = loop1(ls);
  46.         long elapsed1 = System.nanoTime() - startTime1;
  47.  
  48.         long startTime2 = System.nanoTime();
  49.         int count2 = loop2(ls);
  50.         long elapsed2 = System.nanoTime() - startTime2;
  51.  
  52.         long startTime3 = System.nanoTime();
  53.         int count3 = loop3(ls);
  54.         long elapsed3 = System.nanoTime() - startTime3;
  55.  
  56.         System.out.println("Elapsed1: " + elapsed1 + " ns");
  57.         System.out.println("Elapsed2: " + elapsed2 + " ns");
  58.         System.out.println("Elapsed3: " + elapsed3 + " ns");
  59.     }
  60.  
  61. }
Success #stdin #stdout 0.63s 320576KB
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Standard input is empty
stdout
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Elapsed1: 99760529 ns
Elapsed2: 59375177 ns
Elapsed3: 90220306 ns
https://ideone.com/2rmQDp
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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