Java中ArrayList使用范例代码，arraylist范例,import java.

Java中ArrayList使用范例代码，arraylist范例,import java.

import java.util.ArrayList;public class myArrayList {   public static void main(String[] args) {      ArrayList<Integer> vals =  new ArrayList<Integer>();      vals.add(100);      vals.add(90);      vals.add(80);      vals.add(70);      vals.add(60);      int total = 0;      /*for(int i = 0; i < vals.size(); ++i) {         total += vals.get(i);      }*/      for (Integer val : vals) {         total += val;      }      double average = total / vals.size();      System.out.println("Size of vals: " + vals.size());      System.out.println("Average: " + average);      vals.remove(4);      System.out.println("New size: " + vals.size());      vals.add(60);      vals.add(50);      System.out.println("Newer size: " + vals.size());   }}