Set of variable length Java - ArrayList class

Set of variable length Java - ArrayList class

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Explanation

ArrayList is an implementation of the collection, implements the interface List, List interface extends the Collection interface. Collection is the parent class of all collections

usage

//创建
ArrayList<String> list = new ArrayList<>();

Common method

add，addAll，set，get，remove，size，isEmpty等

add (E element) added

list.add('小明');

set (int index, E element) inserted

list.set(3，'小花');

get (int index) Gets

list.get(1);

remove (int index) Delete

list.remove(1);

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