参考：java中集合Collection转list对象(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fblog.csdn.net%2Fqq_27908393%2Farticle%2Fdetails%2F82020704)首先我的需求是获取到购物车列表，购物车列表是一个Map对象，构

importjava.util.ArrayList;importjava.util.List;importjava.util.Map;importjava.util.stream.Collectors;publicclassTest{publicstaticvoid

先上代码：主函数：1.publicclassGCDemo{3.publicstaticvoidmain(String\\args)throwsInterruptedException{6.List<GCDataObjectlistnewArrayList<GCDat

Collection├List│├LinkedList│├ArrayList│└Vector│　└Stack└SetMap├Hashtable├HashMap└WeakHashMapCollection接口　　Collection是最基本的集合接口，一个Collection代表一组

删除工具类：importjava.io.File;publicclassDeleteAll{publicstaticvoiddeleteAll(Filefile){if(file.isFile()||file.list().length0){

include<stdio.hinclude<stdlib.hdefineboolintdefinetrue1definefalse0structList{  structNode\ptrNode;  intnLen;};structNode{

emoveallelementsfromalinkedlistofintegersthathavevalue _val_.Example:Input:1263456,_val_6Output:12345实现：publicst

<divid"cnblogs\_post\_body"class"blogpostbody"<p<spanstyle"fontsize:18pt"1.后台接收json数组转成封装实体类的List：</span</p<divclass"cnblogs\_code"<divclass"cnblogs\_code\_tool

importjava.util.LinkedList;importjava.util.List;publicclassEcgUtils{/获取频率@paramdata所有的数据20秒的数据