Java ArrayList trimToSize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 elements in the list
      arrlist.add(35);
      arrlist.add(20);
      arrlist.add(25);

      // Trim the arraylist
      arrlist.trimToSize();

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