In Java, we need to declare the size of an array before we can use it. Once the size of an array is declared, it's hard to change it. 在Java中,我们需要先声明数组的大小,然后才能使用它。一旦声明了数组的大小,就很难更改它。 To handle this issue, we can use theArrayListclass. TheArra...
我们可以看一下,ArrayList实现类源码中的第一段注释: Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array t...
The ArrayList class is a resizable array, which can be found in the java.util package.The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified (if you want to add or remove elements to/from an array, you have to create a ...
public class ArrayListDemo02 {public static void main(String[] args) {//创建集合ArrayList<String> array = new ArrayList<String>();//添加元素array.add("hello");array.add("world");array.add("java");//public boolean remove(Object o):删除指定的元素,返回删除是否成功System.out.println(array.r...
ArrayList类自己维护了一个java.util.ArrayList.SubList类,这里需要注意的是SubList类是作为一个视图存在的,也就是说,如果你对SubList类进行任何操作都会影响到原来的父集合,而不是说独立存在的,下面,我们来看看其中的一个实现。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** * 将该子集合的index索引位...
Creating a Generic ArrayList object can also be done in separate lines like this: ArrayList<String> arlist; arlist = new ArrayList(); 注意:我们不能使用原始数据类型作为类型。例如,ArrayList<int>是非法的。 Java ArrayList Initialization 在Java 中初始化数组列表有三种方法。它们如下: ...
Namespace: Java.Util Assembly: Mono.Android.dll Resizable-array implementation of the List interface. C# Kopie [Android.Runtime.Register("java/util/ArrayList", DoNotGenerateAcw=true)] [Java.Interop.JavaTypeParameters(new System.String[] { "E" })] public class ArrayList : Java.Util.Abstra...
Fields inherited from class java.util.AbstractList modCount Constructor Summary Constructors ConstructorDescription 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 the orde...
public class TestArrayList{public static void main(String[] args) {// 创建集合 ArrayList<String> array = new ArrayList<String>();// 添加元素 array.add("hello"); array.add("world"); array.add("java");// public boolean remove(Object o)：删除指定的元素，返回删除是否成功 ...
import java.util.ArrayList; public class ArrayListDemo02 { public static void main(String[] args) { //创建集合 ArrayList<String> array = new ArrayList<String>(); //添加元素 array.add("你好"); array.add("博主"); array.add("一计之长"); //public boolean remove(Object o):删除指定的元...