packageguru.springframework.blog.sortarraylist.ascendingdescending;importorg.junit.Test;importjava.util.ArrayList;importstaticorg.junit.Assert.*;publicclassSortArrayListAscendingDescendingTest{@TestpublicvoidtestSortAscendingDescending()throws Exception{ArrayList countryList=newArrayList<>();countryList.add("France"...
package synchronizeTest; import java.util.Collections; import java.util.Iterator; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; public class AddingTest { public static void main(String[] args) { CopyOnWriteArrayList<String> al = new CopyOnWriteArrayList<String>(); al.add("A...
在ArrayList中添加两种不同的数据类型是不推荐的,因为ArrayList是一个泛型类,它要求所有元素都具有相同的数据类型。在Java中,泛型是用来在编译时强制执行类型检查的机制,以确保类型安全性...
packagestudy.collection;importjava.util.ArrayList;importjava.util.Date;importjava.util.List;publicclassTestDemo01 {publicstaticvoidmain(String[] args) { List list=newArrayList();//ArrayList:底层实现时数组,线程不安全,效率高。所以,查询快。修改、插入、删除慢。//LinkedList:底层实现是链表,线程不安全,效...
package com.itheima.arraylist; import java.util.ArrayList; public class ArrayListDemo2 { public static void main(String[] args) { ArrayList<String> list = new ArrayList<>(); list.add("Java"); list.add("Mysql"); // list.add(23); ...
Java集合框架:ArrayList 简介:ArrayList定义package java.util;public class ArrayList extends AbstractList implements List, RandomAccess, Cloneable, java. ArrayList定义 package java.util;publicclassArrayList<E>extendsAbstractList<E>implementsList<E>, RandomAccess, Cloneable, java.io.Serializable{privatestatic...
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...
package test; importjava.util.ArrayList; import java.util.List; public class ArrayListInThread implements Runnable{ List<String> list1 = new ArrayList<String>();// not thread safe // List<String> list1 =Collections.synchronizedList(new ArrayList<String>());// thread safe ...
二、测试实例package com.inspur.Test;import java.util.ArrayList;import java.util.HashMap;import java...
Modulejava.base Packagejava.util Class ArrayList<E> Type Parameters: E- the type of elements in this list All Implemented Interfaces: Serializable,Cloneable,Iterable<E>,Collection<E>,List<E>,RandomAccess Direct Known Subclasses: AttributeList,RoleList,RoleUnresolvedList ...