类集框架List

package su;import java.util.ArrayList;import java.util.List;public class Test{    public static void main(String args[]){        List<String> list = new ArrayList<String>();        //List中的元素可以重复        list.add("a");        list.add("b");        list.add("c");        list.add("a");        for(int i = 0;i < list.size();i++){            System.out.println(list.get(i));        }        int a = list.size();        System.out.println(a);        list.remove(3);        list.clear();    }}