package Collection; import java.util.Arrays; import java.util.Collections; import java.util.List; import java.util.PriorityQueue; import java.util.Queue; import org.eclipse.jdt.internal.compiler.ast.ThisReference; import Chapter13ConnectionInterface.PriorityQueueTest; public class PriprityQueueTest { public static void printQueue(Queue queue){ while(queue.peek()!=null) System.out.print(queue.remove()+" "); System.out.println(); } public static void main(String[] args) { List list=Arrays.asList(2,34,7,9,3,65,86,45,2); PriorityQueue priorityQueue=new PriorityQueue(list); //为什么打印不一样？？？？？ System.out.println(priorityQueue); PriprityQueueTest.printQueue(priorityQueue); //倒序 PriorityQueue priorityQueue2=new PriorityQueue(list.size(), Collections.reverseOrder()); priorityQueue2.addAll(list); PriprityQueueTest.printQueue(priorityQueue2); } }