List中remove元素的理解

今天写了个简单的list中remove元素的方法，结果报错。。。

List<String> ll = Arrays.asList("1","2","3","4","5");
for (int i=0; i < ll.size(); i++){
    ll.remove(i);
}

报错，java.lang.UnsupportedOperationException，这个是因为Arrays.asList()返回AbstractList，没有实现增删改操作，用如下构造方式解决。

List<String> list = new ArrayList<>(Arrays.asList("1","2","3","4","5"));
for (int i = 0; i < list.size(); i++){
    list.remove(i);
}
System.out.println(list);

注意这种方式并不是把所有元素删除（list.size()）

list = new ArrayList<>(Arrays.asList("1","2","3","4","5"));
for (String s : list){
    list.remove(s);
}
System.out.println(list);