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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.util.concurrent.atomic.AtomicInteger;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class AtomicIntegerTest {
  10.     public static void main(String[] args) {
  11.         int n = 200_000_000;
  12.         int i = 0;
  13.         long start = System.currentTimeMillis();
  14.         while (i < n) {
  15.             i++;
  16.         }
  17.         long end = System.currentTimeMillis();
  18.         System.out.println("int: " + (end - start) + "ms");
  19.  
  20.         Integer in = 0;
  21.         start = System.currentTimeMillis();
  22.         while (in < n) {
  23.             in++;
  24.         }
  25.         end = System.currentTimeMillis();
  26.         System.out.println("Integer: " + (end - start) + "ms");
  27.  
  28.         AtomicInteger ai = new AtomicInteger(0);
  29.         start = System.currentTimeMillis();
  30.         while (ai.get() < n) {
  31.             ai.incrementAndGet();
  32.         }
  33.         end = System.currentTimeMillis();
  34.         System.out.println("AtomicInteger: " + (end - start) + "ms");
  35.     }
  36. }
Success #stdin #stdout 2.74s 125968KB
comments (?)
stdin 
Standard input is empty
stdout 
int: 3ms
Integer: 582ms
AtomicInteger: 2023ms
https://ideone.com/m8rhHp
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
secret

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