Java方法toArray（）

import java.util.ArrayList;

public class ArrayListDemo {

   public static void main(String[] args) {

      ArrayList<Integer> arrlist = new ArrayList<Integer>(5);

      arrlist.add(20);

      arrlist.add(40);

      arrlist.add(10);

      arrlist.add(15);

      arrlist.add(25);

      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);

      }

   }

}