problem description java.util.function,, A code that determines whether a field is empty has been rewritten (some business definitions assume that a field is empty by default if it is equal to-1). ,,,: related codes Old Code public static &...
use Java8 time-related API to get the Monday of a week, such as 2018-W48, which indicates the 48 weeks of 2018. How to get the time of 48 weeks of Monday? ...
topic description lambda groupingBy Advanced questions List < A > how to convert to List < B > sources of topics and their own ideas looked up a lot of materials and found that most of the Internet teaches how to convert List into Map < String,Li...
original code: private static JSONArray produceTree(List<Resource> resources,boolean needPermission){ JSONArray tree = new JSONArray(); if(resources!=null&&resources.size()>Number.ZERO) { for (Resource resource : res...
Map < String,List < String > replace with Map < String,Java > the original data structure is as follows: Map < String,String > map=new LinkedMultiValueMap < > (); map.add ( "java ", "1.7 "); map.add ( "java ", "1.8 "); the map after adding data ...
the code is as follows public static void main(String[] args) { List<String> list = new ArrayList<>(); list.add("hello"); list.add("alex"); list.add("front"); BiConsumer<List<String>...
github downloaded nginx-admin,java8 compiled, imported eclipse Times error, looked at the following code, there are several similar statements import com.jslsolucoes.nginx.admin.model.Nginx; import com.jslsolucoes.nginx.admin.model.Nginx_; In the mode...
What is the main application of Supplier,Predicate introduced in Java8? Can you give an example of practical application? thank you ...
description trouble boss to point out how to reconstruct the operations of different objects with the same method? At the bottom of is the code. The save methods here are all the same operation. The object is used as a reference here. I just want...
Code: Stream.of("d2", "a2", "b1", "b3", "c") .sorted((s1, s2) -> { System.out.printf("sort: %s; %s n", s1, s2); return s1.compareTo(s2); }) .filter(s -> { ...
I have an object List, such as List < Main >, a property in Main is a Sub object, and an attribute id in Sub. I want to sort by Main.Sub.id. What should I do? list < Main > .stream (). Sorted (Comparator.comparing (Main::getSub)) cannot be sorted by ...
I downloaded the page of China Weather Network using Python and requests, but the content of "Typhoon Dynamics " on the left was missing. That s strange. How to solve it? this is what happens when I download the web page and open it. the foll...
UDP is used in the project to send data to the client. How to set the expiration time of UDP sending? API not found ...
my spring boot 2.0.3 tomcat version 8.5.37 will report when it starts using the external tomcat of the idea startup project. 10-Jan-2019 08Groupe 59,36.509 RMI TCP Connection [RMI TCP Connection (3)-127.0.0.1] org.apache.catalina.core.ApplicationCo...
configure according to the official website of antd. As a result, npm start startup reported an error. I don t know why config-overrides.js package.json ...
because every user will have one or more attribute structures like this: so if I do this <? foreach ($data->{ attributes } as $value) { echo $value; }?> can list every id now the problem is that this array has several different c...