Java
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Java – a unique list of elements for a given list
Given the ArrayList transaction of sorted integer ArrayLists, I am writing code to return its unique element For examp…… -
Java – selenium: http: / / localhost: 4444 / WD / hub returns NullPointerException. What did I do wrong
Given: try using this code to use remotewebdriver in c# var url = new Uri("http://localhost:4444/wd/hub"); var wd = ne…… -
Rxjava allows multiple onerror calls
I tried to allow unlimited flow on the next and wrong call The following code uses the retry () method. I assume that …… -
Java – Hal rendering cannot be obtained using spring HATEOAS and Jersey
I use spring initializr（ https://start.spring.io/ ）To create a starter application with only "Jersey (Jax - RS)" and…… -
Java-8 – Java 8 – maps to comma separated pairs in parentheses
What is the best method in Java 8? Map<Integer,Integer> Like a string: [k1,v1],[k2,v2],[k3,v3]... I'm looking at…… -
Java – constructor. In onbindviewholder() What is the difference between getadapterposition () and the position attribute of the constructor [copy]
See English answer > lint error "do not treat position as fixed; only use immediately..." 1 public void onBindViewH…… -
Java – change the time zone of Tomcat [copy]
See English answers > change timezone in Tomcat 4 >When I use the java time pack to access the system default ti…… -
Haskell – memory usage of deferred data types
I wrote a program to analyze and operate on the data in the file My first implementation uses data Bytestring to read …… -
Java – the equivalent file. Java in Google drive API v3 Settitle method
This is an official example: package com.google.api.services.samples.drive.cmdline; import com.google.api.client.auth…… -
java – Performance Encog vs Deeplearning4J
We are developing Java projects using neural networks We want to test different network structures on our data set Now…… -
Java – Operator ‘cannot be applied to’t’, which represents a bounded generic type
See English answers > generic type extending number, calculations 2 class MathOperationV1<T extends Number> {…… -
Unit test – unit test vertx – Java util. concurrent. TimeoutException
I'm trying to test HTTP calls from the vertx webclient unit using the rxified version of vertxunitrunner and vertx The…… -
Java – will this implementation be called an anonymous class?
I've seen it many times, but I'm a little confused. Will it be called anonymous class? public class Test { public …… -
Java – tells class members the type of variables at creation time
Suppose I have a citydistrict class, as follows: class CityDistrict { List<House> houses; ... } Suppose …… -
Java – gson: parameter get serialized, even if it has @ expose (serialize = false)
I'm writing SDK for JSON API, and I encountered a seemingly strange problem The API is very strict in post data valida…… -
Java – why don’t these semicolons produce errors?
See English answer > what is the use of an empty statement (not for loop) in Java? [closed] 6 public class Main{ …… -
Assign the return value to the new variable (Java)
It's been a while since I did some java coding I need to build an application for the business that needs to be automa…… -
Java – hibernate extra query after join fetch on the same entity
I try to query a large number of entities by using this query, although Hibernate: "Select * " + " From Dossie…… -
Java – get the POI Workbook of InputStream for OM Apache
Is there any way to get the InputStream of Apache POI workbook? I need it to pipe to another OutputStream, but I can't…… -
Java – Jackson captures unrecognized fields in the map
I use Jackson in Java rest API to handle request parameters My class: public class ZoneModifBeanParam extends ModifBea…… -
Java – the spring boot cannot parse placeholders in strings
I run spring boot on the embedded Tomcat server through Maven and MVN clean install spring boot: run But every time I …… -
Java – rewrite the same method twice from the same class
I understand how the iterator () method works with the ArrayList class In the ArrayList class, I found that the iterat…… -
Java – missing annotation handling menu in eclipse
I use this manual https://github.com/excilys/androidannotations/wiki/Eclipse-Only-Configuration "5 Go to Java Compiler…… -
Close, destructor and finalize: Java conflict
See English answers > why does a try / catch block create new variable scope? 5 try { FileInputStream in = new Fil…… -
External configurable filtering using java lambda
Suppose I have an external JSON: [{ "condition": "equals","field": "name","value": "jack" },{ "condition": "…… -
Java – Maven: exclude the “meta-inf / Maven” folder from the jar
I use Maven to build jars When I checked the jar, I saw a maven folder in the meta - inf folder I want it to be exclud…… -
String concatenation does not work in Java when concatenating two results of a ternary operator
Dear Java master! Please explain why concatenation does not work properly in Java when connecting two results of terna…… -
Java – programming the difference between POJOs and beans
I have the following two classes Can I say that the first is a POJO class and the second is a bean class? 1) POJO clas…… -
Why is the combiner function reduction operation not performed in the java-8 stream?
See English answers > java 8 stream – reduce function's combiner not getting executed Stream.of(1,2,3,4,5,6,7).redu…… -
Java – returns only the last element in the ArrayList
I've been teaching myself Java. I've always insisted on a problem. No matter what I do, it seems that I can't solve it…… -
Java – use groupingby for nested maps, but collect different types of objects
So I have the code for this "work" (replace some names for simplicity): Map<String,Map<String,ImmutableList<S…… -
How to use multiple streams and in Java 8 with lambda expressions Map function
I have a list County, which only contains the unique county name, and a list txcrarray, which contains the city name, ……