Java ArrayList toArray方法

package com.codingdict;

import java.util.ArrayList;

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

      // create an empty array list with an initial capacity
      ArrayList<Integer> arrlist = new ArrayList<Integer>(5);

      // use add() method to add values in the list
      arrlist.add(20);
      arrlist.add(40);
      arrlist.add(10);
      arrlist.add(15);
      arrlist.add(25);

      // let us print all the elements available in list
      for (Integer number : arrlist) {
         System.out.println("Number = " + number);
      }  

      Object[] ob = arrlist.toArray();

      System.out.println("Printing elements from first to last:");
      for (Object value : ob) {
         System.out.println("Number = " + value);
      }
   }
}