包含标签：Java 的文章
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Java – return value from asynchronous rest template spring
I'm using spring to create an asynchronous rest call @GetMapping(path = "/testingAsync") public String value() throws …… -
Java – load spring boot properties from JSON file
Is it possible to start from The JSON file loads the spring boot configuration instead of Yaml or properties？ From lo…… -
Java – to check whether a string can be parsed to an integer?
I want to check a string I pass to integer Valueof (string s) a valid string to parse If one is not parsed, I need to …… -
Java forced volatile access
Consider such a situation There are two threads and a shared resource (such as HashMap) A thread creates a HashMap and…… -
How to handle exceptions in Java 8 stream?
I have a method. I traverse the list and create the list In doing so, I call a method (createresult) to throw a custom…… -
Java – instantiate ArrayList by reading rows from scanner, where to declare objects?
I want to fill the array list with lines from the input file, which is as follows: 7f000000000000000000000000000000000…… -
Java – play location service getlastlocation returns null
I'm trying to listen to location changes, but sometimes the onlocationchanged callback is never called, getlastlocatio…… -
Java – querydsl does not use spring boot and Maven to generate Q classes
I don't know why, but I can't use spring boot and query DSL to generate query classes This is my POM xml： <propert…… -
Java – horizontal recycler view with left and right arrow indicators
I'm trying to use the left and right arrow indicators to achieve a horizontal loop view So what happens is that if you…… -
Java – if first is true, it is logical or the second statement is ignored
See English answers > java logical operator short circuiting 9 Solution No, No >Using the Boolean operator |, if…… -
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, ……