1. 引入包:在 Java 文件中使用 ArrayList 类之前,需要先引入 java.util 包,可以使用 import java.util.*; 或 import java.util.ArrayList; 语句进行引入。 2. 创建对象:通过调用 ArrayList 类的构造函数来创建 ArrayList 对象,可以按照以下方式创建: ``` ArrayList<String> arrayList = new ArrayList<String>()...
You can also add an item at a specified position by referring to the index number:Example import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<String> cars = new ArrayList<String>(); cars.add("Volvo"); cars.add("BMW"); cars.add("Ford"...
我们看看ArrayList中迭代器Iterator和get方法的实现 Java private class Itr implements Iterator<E> { int cursor; // index of next element to return int lastRet = -1; // index of last element returned; -1 if no such int expectedModCount = modCount; public boolean hasNext() { return cursor !
System.out.println("Checking if the arraylist contains the object Item5: "+ element);// 获取指定位置上的元素String item = list.get(0); System.out.println("The item is the index 0 is: "+ item);// 遍历arraylist中的元素// 第1种方法: 循环使用元素的索引和链表的大小System.out.println("...
2.2 实例化 ArrayList 对象 2.2.1 实例化一个默认初始容量为 10 的空 List class ArrayListTest { public static void main(String [] args) { new ArrayList(); } } 1. 2. 3. 4. 5. ArrayList 对应的构造函数源码如下: /** * Constructs an empty list with an initial capacity of ten. ...
ArrayList: /*** Returns the element at the specified position in this list. * *@paramindex index of the element to return *@returnthe element at the specified position in this list *@throwsIndexOutOfBoundsException {@inheritDoc}*/publicE get(intindex) { ...
2. Examples of Adding elements at the Specified Index Let us take an example of adding an item at the index position1. ArrayList<String>namesList=newArrayList<>(Arrays.asList("alex","brian","charles"));namesList.add(1,"Lokesh");System.out.println(namesList);//[alex, Lokesh, brian, ch...
public void testIndexOutOfBoundsException() { ArrayList emptyList = new ArrayList(); Object o = emptyList.get(0); } 代码示例来源:origin: stackoverflow.com public class SortedList<E> extends AbstractList<E> { private ArrayList<E> internalList = new ArrayList<E>(); // Note that add(E ...
IllegalArgumentException- If end index is less than the start index. More Examples Example A list can be changed by changing a sublist: importjava.util.ArrayList;importjava.util.List;publicclassMain{publicstaticvoidmain(String[]args){ArrayList<String>cars=newArrayList<String>();cars.add("Volvo")...
removeLast():删除并返回链表的尾元素。 size():返回链表中元素的个数。 get(int index):返回链表中指定位置的元素。 测试用例 以下是对LinkedList类进行测试的代码: 测试代码 代码语言:java AI代码解释 packagecom.example.javase.collection;importjava.util.LinkedList;/** ...