CSC301: Phone numbers Performance [5/9] Previous pageContentsNext page

file:algs34/XPhoneNumberPerformanceTest.java [source] [doc-public] [doc-private]
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package algs34;

import java.util.HashSet;
import stdlib.*;

public class XPhoneNumberPerformanceTest {
  private static int NUM_SIZES = 6;
  private static int START_SIZE = 25000;
  public static void main(String[] args) {
    int size = START_SIZE;
    for (int count=1; count<NUM_SIZES; count++) {
      size += size;
      HashSet<XPhoneNumber> set = new HashSet<> ();
      Stopwatch sw1 = new Stopwatch ();
      for (int i=size-1; i>=0; i--) {
        XPhoneNumber x = new XPhoneNumber
          (StdRandom.uniform (1000), StdRandom.uniform (1000), StdRandom.uniform (10000));
        set.add(x);
      }
      double time1 = sw1.elapsedTime ();
      Stopwatch sw2 = new Stopwatch ();
      for (int i=size-1; i>=0; i--) {
        XPhoneNumber x = new XPhoneNumber
          (StdRandom.uniform (1000), StdRandom.uniform (1000), StdRandom.uniform (10000));
        set.contains (x);
      }
      double time2 = sw1.elapsedTime ();
      System.out.format ("%9d: add=%f contains=%f\n", size, time1, time2);
    }
  }
}

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