Recent Posts
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Java – specifies the specific enumeration passed to the method in the mockito doreturn method
I have a JUnit test. I have an object simulated in a class Let's call the mocker class with @ mock of mymanager named …… -
Pass checkstyle to Java Hello World
So I'm a novice using checkstyle. For my simple HelloWorld Java program, I received a lot of errors that I don't under…… -
Java – how do I use group mapping streams?
I have a long child // ordered by parent.id / child.id Stream<Child> childStream; Say, Child(id = 1,parent(id = …… -
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, …… -
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 forced volatile access
Consider such a situation There are two threads and a shared resource (such as HashMap) A thread creates a HashMap and…… -
Java – use spring batch to parse dates from files to localdatetime
I'm trying to read a CSV file with a date using spring batch, but I can't resolve the date to a localdatetime object: …… -
Java – (custom) exception of restauthenticationprocessingfilter ordering
I tried to add rest authentication to my application with a token public class RestAuthenticationProcessingFilter exte…… -
From the switch inside do, but there is no Boolean value. Is this possible? Java
So the code is about the restriction of giving input in do while Maybe it may not have Booleans, or it may change or a…… -
Has the allobjects () method in Java – realm been deprecated?
I'm trying to display list items in listview using realm offline database I followed some tutorials and he used the al…… -
Java – thread safe denies atomicboolean get() as a condition in the while loop
Suppose I have the following code: AtomicBoolean condition; condition = new AtomicBoolean(false); (...) while(!conditi…… -
Accessing private variables through static methods in Java
Suppose I have the following Java classes: public class A { private int x; public A(int x){ this.x…… -
Java 8 option list collection list compilation error
I can't understand the difference Stream<Optional<Integer>> optionalStream = Stream.of( Op…… -
Java – @ before / @ beforeclass doesn’t seem to work, and the object represents null
I was learning JUnit and had a problem at the beginning At the beginning, I want to initialize the object that will be…… -
Haskell pattern matching vector
I'm following an online tutorial on Haskell We define a function to add a two-dimensional vector, represented by tuple…… -
Java – after successful matching, continue to match the scala switch of the next case
How to execute another case block after executing one case block in a Scala switch statement (in Java: no interruption…… -
Neo4j – Java heap space Wrong query or setting?
I have neo4j a problem introduce I have to build an application that stores bus / train routes This is my architecture…… -
Java – should hibernate use a unique sequence for each table?
I have several entities using automatic key generation strategies with hibernate and Postgres @Id @GeneratedValue(stra…… -
Using java to convert children to parent problems
class Parent { class Parent { int i = 60; } class Child extends Parent { int i = 70; } class Main { pub…… -
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…… -
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 – 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 – removes the space between the toolbar and tabrayout
I have an appbarlayout with tablayout, which is located in the activity with toolbar But there is a space between the …… -
Java – “do not allow exceptions to be caught” checkstyle Report
I'm generating a checkstyle report embedded in Maven site, and one of the problems is that it indicates that exception…… -
Java – spring data JPA repo, why do you need interface services and service implementations
I've just started developing spring boot. JPA using spring data JPA When I generate a model from a table, I create a m…… -
Java – populating the spinner with data from the SQLite database – application crash
I'm trying to load data (specific columns in the table) into the spinner Every time I save data in allgemein and try t…… -
Java – unable to create a new session Error in appium code
Unable to create new session (original error: a new session is requested, but one of them is in progress) this error i…… -
Java generics – a comparable interface
In the following code, the comparable interface is used to ensure that X and y should have the same reference type, bu…… -
Java – what is the difference between these generic statements?
See the English answer > is this raw type assignment type safe? List = new ArrayList(); 1 Map<String,Intege…… -
How to create a general placeholder function in Java and use the function as a parameter later?
I don't know how to express my question, but it's simple I want to create a generic placeholder function that takes a …… -
Understanding Java executorservice
I'm trying to learn how to use Java's executorservice, I am reading the following discussion java thread simple queue …… -
Java – insert spaces after commas, periods, and other punctuation marks
In Java, the best way to fix missing spaces after some punctuation is: ,. ; : ? ! For example: String example = "This ……