import java.util.ArrayList; import java.util.List; public class ListMethodsExample { public static void main(String[] args) { List<String> list = new ArrayList<>(); list.add("Apple"); list.add("Banana"); list.add("Cherry"); // 添加元素 list.add("Date"); // 删除元素 list.remove...
or {@linkListIterator#add(Object) add} methods, the iterator will throw a {@link ConcurrentModificationException}. 如果创建了iterator,调用iterator的remove、add将会抛出ConcurrentModificationException(实际用的是子类的java.util.ArrayList.Itr) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19...
候选者：另外的是，ArrayList的增删底层调用的copyOf()被优化过 候选者：现代CPU对内存可以块操作，Array...
下面我们来看一下 AbstractList 类,它继承了 AbstractCollection 类,同时也是 ArrayList 等具体集合类的父类。先来看一下官方的说明: This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a “random access” data store (su...
JDK对Arraylist的解释:Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, includingnul. In addition to implementing the List interface,this class provides methods to manipulate the size of the array that is used internally to store th...
ArrayList<String> strings = new ArrayList<>(); 1. 2. 3. 我们都知道,ArrayList是基于数组的,而数组是定长的。那ArrayList为何不需要指定长度,就能使我们既可以插入一条数据,也可以插入一万条数据?回想刚刚文档的第一句话: Resizable-array implementation of the List interface. ...
Collections.synchronizedList 方法。最好的做法是在创建时,防止其他非同步访问列表。ListlistCollections.synchronizedList(new ArrayList(...)); The iterators returned by this class'siteratorandlistIteratormethods arefail-fast: if the list is structurally modified at any time after the iterator is created, in...
public class SearchFilter implements Serializable { private List<Status> statuses = new ArrayList<>(); @ApiModelProperty(required = false, position = 1) public List<Status> getStatuses() { return statuses; } public SearchFilter setStatuses(List<Status> statuses) { this.statuses = statuses; ret...
The ArrayList.add() in Java adds a single element to the list, either at the end of the list or at the specified index position. Always use generics for compile-time type safety while adding the element to the arraylist. 1. ArrayList.add() Method The add() method first ensures that ...
out.println("]"); } public static void main(String[] args) { // List of Lists ArrayList<List<Integer>> listOfLists = new ArrayList<List<Integer>>(); List<Integer> list1 = new ArrayList<Integer>(); list1.add(50); list1.add(100); listOfLists.add(list1); List<Integer> list2 ...