| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| /* |
| * @test |
| * @bug 4486658 |
| * @summary Checks that a priority queue returns elements in sorted order across various operations |
| */ |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Queue; |
| import java.util.PriorityQueue; |
| |
| public class PriorityQueueSort { |
| |
| static class MyComparator implements Comparator<Integer> { |
| public int compare(Integer x, Integer y) { |
| int i = x.intValue(); |
| int j = y.intValue(); |
| if (i < j) return -1; |
| if (i > j) return 1; |
| return 0; |
| } |
| } |
| |
| public static void main(String[] args) { |
| int n = 10000; |
| if (args.length > 0) |
| n = Integer.parseInt(args[0]); |
| |
| List<Integer> sorted = new ArrayList<>(n); |
| for (int i = 0; i < n; i++) |
| sorted.add(new Integer(i)); |
| List<Integer> shuffled = new ArrayList<>(sorted); |
| Collections.shuffle(shuffled); |
| |
| Queue<Integer> pq = new PriorityQueue<>(n, new MyComparator()); |
| for (Iterator<Integer> i = shuffled.iterator(); i.hasNext(); ) |
| pq.add(i.next()); |
| |
| List<Integer> recons = new ArrayList<>(); |
| while (!pq.isEmpty()) |
| recons.add(pq.remove()); |
| if (!recons.equals(sorted)) |
| throw new RuntimeException("Sort test failed"); |
| |
| recons.clear(); |
| pq = new PriorityQueue<>(shuffled); |
| while (!pq.isEmpty()) |
| recons.add(pq.remove()); |
| if (!recons.equals(sorted)) |
| throw new RuntimeException("Sort test failed"); |
| |
| // Remove all odd elements from queue |
| pq = new PriorityQueue<>(shuffled); |
| for (Iterator<Integer> i = pq.iterator(); i.hasNext(); ) |
| if ((i.next().intValue() & 1) == 1) |
| i.remove(); |
| recons.clear(); |
| while (!pq.isEmpty()) |
| recons.add(pq.remove()); |
| |
| for (Iterator<Integer> i = sorted.iterator(); i.hasNext(); ) |
| if ((i.next().intValue() & 1) == 1) |
| i.remove(); |
| |
| if (!recons.equals(sorted)) |
| throw new RuntimeException("Iterator remove test failed."); |
| } |
| } |