import java.util.ArrayList; public class RunoobTest { public static void main(String[] args) { ArrayList<String> sites = new ArrayList<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...
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,...
Example:importjava.util.*;publicclassDetails {publicstaticvoidmain(String args[]) { ArrayList<String> books =newArrayList<String>(); books.add("Java Book1"); books.add("Java Book2"); books.add("Java Book3"); System.out.println("Books stored in array list are: "+books); } } Output:...
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...
Another useful class in the java.util package is the Collections class, which include the sort() method for sorting lists alphabetically or numerically:Example Sort an ArrayList of Strings: import java.util.ArrayList; import java.util.Collections; // Import the Collections class public class Main ...
Java COPY 上述方法举例说明: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 importjava.util.ArrayList;importjava.util.Arrays;publicclassArrayListTest{classHuman{}classMaleextendsHuman{}publicstaticvoidmain(String[]args){ArrayList<Integer>list1=newArrayList<Integer>();list1.add(1);// Appends the ...
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....
java.io.ObjectInputStream s)throws java.io.IOException, ClassNotFoundException {// Read in size,...
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 ...