Java
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Java – instead of creating a new string object, print a string with edit characters using a char array
The purpose of this code is to change the string "a happy" to "a hippy" String originalStr = "A Happy"; char[] charOri…… -
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 – 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…… -
Java – Convert list to map and filter null keys
Using the Java 8 stream, I want to convert the list into a map as described in the solution of Java 8 list < V >…… -
Java 8 lambda specifies the map type and makes it immutable
I have the following code, generated using Lambdas for several months Map<Integer,String> tempMap = new LinkedHa…… -
Go – concurrent file system scanning
I want to get the file information of the files in the directory (file name and size, in bytes) But there are many sub…… -
Java – the difference between string, string builders, character arrays and ArrayList
Strings are immutable String builders are not, so you can add characters at the end String is a character array. If I'…… -
Java – method of overriding with different parameters
Suppose I have a parent class: class Parent{ public void aMethod() { //Some stuff } } It is a children…… -
Why if comparison doesn’t work in Java
I create a hash table in Java This is part of my code while (table[pos]!=null) { if (table[pos]==key) { …… -
Java lambda – finds whether any string element of a list matches any element part of another list
I have two string lists A = {"apple","mango","pineapple","banana",... } B = {"app","framework",...} What I'm looking …… -
jsf-2 – javax. faces. Facesexception: public key for catpcha not found
I want to implement the verification code in my application, but I get this error. Can someone tell me the reason? Sol…… -
Java – directly from completable future Thenaccept return value
I tried to return a list from completable future as follows: public List<Provider> get() { CompletableFuture…… -
Java – how do I capture connection events in my websocket server using spring 4?
I use spring 4, stomp and sock JS for simple web socket communication, follow this https://github.com/rstoyanchev/spri…… -
Java – replacing stream collection in kotlin native solutions
I am currently using the kotlin function to extract a map from a JSON structure with key value pairs The JSON used to …… -
Java 8 streams can use multiple projects in a mapping pipeline
I have some data stored in the JPA repository I'm trying to process I wish I could use Java 8 streams to do this, but …… -
Java – request getRequestDispatcher(). Forward create a new thread?
I have a use case that schedules requests by setting some properties and pruning the request URL to the same context W…… -
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 – 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…… -
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 — call Runtime. in the onLowMemory method. gc()
Should we use runtime GC () or system GC () to clear the memory in the production code in the onlowmemory () method in…… -
Java 8 stream – merge two sets to make them unique in a specific field [copy]
See English answers > java 8 distinct by property 20 This is the best I can do in Java, but it collects unique name…… -
How to use libgdx to obtain mobile phone language?
I am setting the default language of my game. I hope it is the language of my mobile phone. The question is: how can I…… -
Java – adds multiple bigdecimals to a map
I tried to aggregate multiple bigdecimals from the list At present, I am using two streams, but if possible, I want on…… -
Java – does the HTTP protocol version “http / 1.1” contain HTTPS?
I don't actually see this problem, perhaps because it is so basic I am using java Apache httpcomponent and check the r…… -
Java – is it better to use inline local variables or chain methods?
If I have a series of method calls, each value for the next call, I should store them in local variables, as follows: …… -
Java – algorithm – the largest left sub array with smaller elements
I'm developing a program. I need to get the index of elements in the integer array, so that all elements on the right …… -
Java – sorted concurrentmodification exception
I wrote this applet to sort arrays According to my understanding, it should print 0,1,2 However, when I run this progr…… -
Think in Java version 4 – what is classname this. method()
Reading "thinking in Java 4th Edition", I found this example in Chapter 14: public class CoffeeGenerator implements Ge…… -
Java – use 𞓜 to compress the basic code and operators with strings
I am a novice in Java programming I can't find any information about using | operators and strings I wonder if there i…… -
Java – texture deformation, 4 points
I'm writing a simple 3D game in Java. I need code / library for texture deformation I don't want to use OpenGL Example…… -
Java – processrequest method
When is the processrequest method called? It's hard for me why, why and how to invoke process requests? The reason for…… -
Java – spring data Cassandra: how to use composite keys to query tables?
I have the following families: @Table(value = "request_event") public class RequestEvent { @PrimaryKeyColumn(name……