In the above program, we have usedIntegerandString. Here,Integeris the corresponding wrapper class of theinttype. 在这里,Integer是int类型的相应包装器类 A wrapper class is a class that wraps a primitive data type. For example, theIntegerclass wraps theinttype, theFloatclass wraps thefloattype,...
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...
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.o...
1packagejava.util;23publicclass ArrayList<E>extends AbstractList<E>4implements List<E>, RandomAccess, Cloneable, java.io.Serializable5{6//序列版本号7privatestaticfinallong serialVersionUID = 8683452581122892189L;89//保存ArrayList中数据的数组10privatetransientObject[] elementData;1112//ArrayList中实际数据...
importjava.util.ArrayList; publicclassRunoobTest{ publicstaticvoidmain(String[]args){ ArrayList<String>sites=newArrayList<String>(); sites.add("Google"); sites.add("Runoob"); sites.add("Taobao"); sites.add("Weibo"); System.out.println(sites.get(1));// 访问第二个元素 ...
publicclassArrayListDemo02{publicstaticvoidmain(String[]args){//创建集合ArrayList<String>array=newArrayList<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.remove("world"...
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 that is used internally to store the list. (This ...
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....
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...
return name.equals(sd.name);}return false;}}public class t2 {public static void main(String[] args) {Scanner reader = new Scanner(System.in);Student[] stu = new Student[4];// 定义ArrayList<Student> stus = new ArrayList<Student>();// ArrayList泛型，每个元素是1个学生。System...