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  1. class PerformanceTest {
  2.     private static class Singleton {
  3.         static Singleton s;
  4.         public static Singleton getInstance() {
  5.             if (s == null) 
  6.                 s = new Singleton();
  7.             return s;
  8.         }
  9.         public int get() {
  10.             return 9;
  11.         }
  12.     }
  13.  
  14.     private static class InstanceRef {
  15.         public int get() {
  16.             return 9;
  17.         }
  18.     }
  19.  
  20.     private static class Timer {
  21.         protected long actualTime;
  22.  
  23.         public void startTask() {
  24.             actualTime = System.nanoTime();
  25.         }
  26.  
  27.         public long getCurrentTime() {
  28.             long i = System.nanoTime() - actualTime;
  29.             return i;
  30.         }
  31.  
  32.         public void printActualTime() {
  33.             System.out.println(getCurrentTime());
  34.         }
  35.     }
  36.  
  37.     public static void main(String[] args) {
  38.         Timer t = new Timer();
  39.         t.startTask();
  40.         new InstanceRef().get();
  41.         t.printActualTime();
  42.  
  43.         Timer ti = new Timer();
  44.         ti.startTask();
  45.         Singleton.getInstance().get();
  46.         ti.printActualTime();
  47.     }
  48. }
Success #stdin #stdout 0.07s 380160KB
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1366348
435425
https://ideone.com/ioErB6
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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