Below is the syntax highlighted version of DoublingTest.java.
/****************************************************************************** * Compilation: javac DoublingTest.java * Execution: java DoublingTest * Dependencies: ThreeSum.java Stopwatch.java StdRandom.java StdOut.java * * % java DoublingTest * 250 0.0 * 500 0.0 * 1000 0.1 * 2000 0.6 * 4000 4.5 * 8000 35.7 * ... * ******************************************************************************/ package edu.princeton.cs.algs4; /** * The {@code DoublingTest} class provides a client for measuring * the running time of a method using a doubling test. * <p> * For additional documentation, see <a href="https://algs4.cs.princeton.edu/14analysis">Section 1.4</a> * of <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne. * * @author Robert Sedgewick * @author Kevin Wayne */ public class DoublingTest { private static final int MAXIMUM_INTEGER = 1000000; // This class should not be instantiated. private DoublingTest() { } /** * Returns the amount of time to call {@code ThreeSum.count()} with <em>n</em> * random 6-digit integers. * @param n the number of integers * @return amount of time (in seconds) to call {@code ThreeSum.count()} * with <em>n</em> random 6-digit integers */ public static double timeTrial(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) { a[i] = StdRandom.uniformInt(-MAXIMUM_INTEGER, MAXIMUM_INTEGER); } Stopwatch timer = new Stopwatch(); int ignore = ThreeSum.count(a); return timer.elapsedTime(); } /** * Prints table of running times to call {@code ThreeSum.count()} * for arrays of size 250, 500, 1000, 2000, and so forth. * * @param args the command-line arguments */ public static void main(String[] args) { for (int n = 250; true; n += n) { double time = timeTrial(n); StdOut.printf("%7d %7.1f\n", n, time); } } } /****************************************************************************** * Copyright 2002-2022, Robert Sedgewick and Kevin Wayne. * * This file is part of algs4.jar, which accompanies the textbook * * Algorithms, 4th edition by Robert Sedgewick and Kevin Wayne, * Addison-Wesley Professional, 2011, ISBN 0-321-57351-X. * http://algs4.cs.princeton.edu * * * algs4.jar is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * algs4.jar is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with algs4.jar. If not, see http://www.gnu.org/licenses. ******************************************************************************/