Java示例阵列删除

import java.util.ArrayList;



public class ArrayListDemo {

   public static void main(String[] args) {

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

      arr.add(20);

      arr.add(15);

      arr.add(30);

      arr.add(45);



      System.out.println("Size of list: " + arr.size());

      for (Integer number : arr) {

         System.out.println("Number = " + number);

      }

      arr.remove(2);

      System.out.println("Now, Size of list: " + arr.size());



      for (Integer number : arr) {

         System.out.println("Number = " + number);

      }

   }

}