java.util.PriorityQueue.toArray(T[] a) 方法

package com.codingdict;

import java.util.*;

public class PriorityQueueDemo {
   public static void main(String args[]) {

      // create priority queue
      PriorityQueue < Integer >  prq = new PriorityQueue < Integer > ();

      // insert values in the queue
      prq.add(6);  
      prq.add(9);
      prq.add(5);
      prq.add(64);
      prq.add(6);

      System.out.println("Priority queue values are: "+ prq);

      // create arr1
      Integer[] arr1 = new Integer[5];

      // use toArrsy() method
      Integer[] arr2 = prq.toArray(arr1);

      System.out.println("Value in arr1: ");

      for ( int i = 0; i<arr1.length; i++ ) {  
         System.out.println("Value: " + arr1[i]) ;
      }

      System.out.println("Value in arr2: ");

      for ( int i = 0; i<arr2.length; i++ ) {  
         System.out.println("Value: " + arr2[i]) ;
      }
   }
}