PriorityQueueTest.java Source code

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Here is the source code for PriorityQueueTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program 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.
    
   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.PriorityQueue;

/**
 * This program demonstrates the use of a priority queue.
 * @version 1.00 2004-08-03
 * @author Cay Horstmann
 */
public class PriorityQueueTest {
    public static void main(String[] args) {
        PriorityQueue<GregorianCalendar> pq = new PriorityQueue<GregorianCalendar>();
        pq.add(new GregorianCalendar(1906, Calendar.DECEMBER, 9)); // G. Hopper
        pq.add(new GregorianCalendar(1815, Calendar.DECEMBER, 10)); // A. Lovelace
        pq.add(new GregorianCalendar(1903, Calendar.DECEMBER, 3)); // J. von Neumann
        pq.add(new GregorianCalendar(1910, Calendar.JUNE, 22)); // K. Zuse

        System.out.println("Iterating over elements...");
        for (GregorianCalendar date : pq)
            System.out.println(date.get(Calendar.YEAR));
        System.out.println("Removing elements...");
        while (!pq.isEmpty())
            System.out.println(pq.remove().get(Calendar.YEAR));
    }
}