ArrayList是java的动态数组,底层是基于数组实现。 1. 成员变量 publicclassArrayList<E>extendsAbstractList<E>implementsList<E>, RandomAccess, Cloneable, java.io.Serializable {/** * The maximum size of array to allocate. * Some VMs reserve some header words in an array. * Attempts to allocate larg...
* instance is emitted (int), followed by all of its elements * (each an Object) in the proper order. */ private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException{ // Write out element count, and any hidden stuff int expectedModCount = modCount; s.defaultWriteObje...
privatevoidensureExplicitCapacity(intminCapacity){//用于迭代器的fail fast机制modCount++;// overflow-conscious code//如果最小容量大于数组的长度,那么扩容。//否则,则不扩容。if(minCapacity-elementData.length>0)grow(minCapacity);} /** * Increases the capacity to ensure that it can hold at least th...
importjava.util.ArrayList;// 引入 ArrayList 类ArrayList<E>objectName=newArrayList<>();// 初始化 E: 泛型数据类型,用于设置 objectName 的数据类型,只能为引用数据类型。 objectName: 对象名。 ArrayList 是一个数组队列,提供了相关的添加、删除、修改、遍历等功能。 添加元素 ArrayList 类提供了很多有用的方法...
Java系列,尽量采用通俗易懂、循序渐进的方式,让大家真正理解JDK源码的精髓! 关于JDK源码中的ArrayList类,官方文档这样描述: Resizable-arrayimplementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, thi...
In this line of code,ArrayListdeclares a new ArrayList that can hold objects of type String.namesis the name of the ArrayList, andnew ArrayList()creates a new, empty ArrayList. You can add elements to an ArrayList using theaddmethod. For example: ...
* * @param c collection containing elements to be retained in this list * @return {@code true} if this list changed as a result of the call * @throws ClassCastException if the class of an element of this list * is incompatible with the specified collection * (<a href="Collection....
Fields inherited from class java.util.AbstractList modCount Constructor Summary Constructors Constructor and Description ArrayList() Constructs an empty list with an initial capacity of ten. ArrayList(Collection<? extendsE> c) Constructs a list containing the elements of the specified collection, in th...
Resizable-arrayimplementation of the <tt>List</tt> interface. Implements all optional list operations, and permits all elements, including <tt>null</tt>. In addition to implementing the <tt>List</tt> interface,this class provides methods to manipulate the size of the array that is used intern...
ArrayList 可能是 Java 数据结构中最简单的一种了,即使一个非 Java 程序员可能也知道这个数据结构,因为所有的语言中都有这样的类似的数据结构。但是在面试中很多人又对它又爱又恨,你真的了解 ArrayList 吗? 一、ArrayList 介绍及其源码剖析 1、什么是 ArrayList 可以简单的认为是一个动态数组;实际上 ArrayList 就...