包含标签：Java 的文章
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Java – retrieves values from nested JSON arrays in mongodb
My Mongo collection has entries in the following format { "myobj" : { "objList" : [ { "locatio…… -
Java – the difference between using the exception class or FileNotFoundException class to catch exceptions
Just like I have these two scenarios, we must deal with FileNotFoundException Case 1: try { FileInputStream fi…… -
Java gives the wrong answer in computing
I want to do some calculations in Java, I know it's not so bad to do something in more steps, but why use additional t…… -
Multithreading – when using a method in a thread, “the type does not meet the required lifecycle”
I tried to use a method in a thread in rust, but I received the following error message Here is the sample code: use s…… -
Java – setlocation in jlabel
My task is to get the position of the mouse when I click, except for one thing: the position of the output I should ge…… -
Java – connect to AEM 6.0 JCR: precondition failed
I encountered some problems connecting to the JCR repository in AEM 6.0 When I reach the point about creating a sessio…… -
How can I avoid doing a lot of if in Java?
In C, I will use the mapping of int / pointer to implement such a function: @ h_ 404_ 7@ std::map = { {Code::Value1,Ha…… -
Java – streams: how maps in streams work
In order to better understand the map function in streams, I tried this: String inputString="1+3+5"; Stream.of(inputSt…… -
Java – Android studio does not parse classes written in kotlin (. KT) in the IDE, but compiles well
I started working on an existing project that uses standard Java and some classes of kotlin Question: These projects c…… -
Java 8 optional how to handle too many orelses
Let's look at an example without Lambdas: @H_ 502_ 8@ @H_ 502_ 8@ Credentials credentials = CredentialService.get(id);…… -
Java – Click to confirm the modal dialog with selenium webdriver
I have a modal dialog like this: I want to click OK to save this text So I use switchto switch to this dialog box: web…… -
Java – render Android support. design. widget. Coordinatorlayout problem
I upgraded Android studio to 2.2 Problems faced after 3 I tried to fix the build path, but it didn't work for me When …… -
Java spark streaming JSON parsing
I have started to learn spark flow from spark engine, and new data analysis and spark I just want to create a small IO…… -
Java – TestNG – @ aftermethod priority
Can the @ aftermethod method method be called in a specific order? public class PriorityTest { @BeforeClass(alwaysRun…… -
Java – how do I reverse the seekbar value?
I have the following code: int min = 1; int max = 255; seekBar.setMax(max - min); seekBar.setOnSeekBarchangelistener…… -
Accessing poloniex HTTP API using java
I tried to connect to poloniex com API https://poloniex.com/support/api/ , which says: But I always get {"error":"Inva…… -
BufferedReader in Java Does readline() put the entire file in memory?
Yes? Or maybe only a single string is placed on each readLine (), and the maximum memory space is the volume of the lo…… -
JavaFX drop-down button
How to create a "drop-down button" in JavaFX? So far, I'm using it Choice@R_206_2419 @, now I have to Choice@R_206_241…… -
Java – static nested subclasses of closed types can still reference private field members. Why?
I've found something vague. With all due respect Suppose we have the following class structure: public class A { p…… -
Java – place numbers on random points in a 2D array
I have a 2D array with 5 rows and 5 columns I want it to place a '1' character at 8 random points in the 2D array (mak…… -
Java – if value is empty, delete the key
Suppose we have a map < key, collection < value > > mymap and a method to delete values from the collectio…… -
JavaDocs throws illegalargumentexception
I am using IntelliJ idea. When I start generating JavaDocs (through tools - > generate Javadoc), I will throw an il…… -
Java – thymeleaf email template and conversionservice
I have a spring MVC application. I try to render a date localdate as a string. It works for normal views, but it doesn…… -
Change the scene in JavaFX without resizing the window
I'm trying to change the scene on JavaFX without changing the window size But when I set stage setScene(scene2); As th…… -
Java – spring rest simulation context path
I tried to set the context path for spring rest mocks using the following code snippet: private mockmvc mockmvc; @Bef…… -
Java – what class What does the forname () method do for JDBC?
See the English answer > what is the purpose of 'class forName(“MY_JDBC_DRIVER”)’? 4 Class.forName("com.MysqL.jdbc.…… -
Definition of constant field in Bloch’s effective java version 2
quote: I'm not sure what that means; Can anyone give an example? Solution An example Josh is talking about is list, wh…… -
Java: how to remove quotation marks from the JSON key using regular expressions
I need to remove double quotes (objects with sub objects and arrays in the hierarchy) from the complex JSON structure …… -
Java – set Proguard to confuse only my application packages
I tried to use Proguard for obfuscation, but got a third-party library error, so I excluded each package one by one: -…… -
Java – regular expressions extract specific strings
1X79 "The X-Files" (1.01) 9/10/93 1/17/94* 11/ 6/94* 1X79 "The X-Files" (1.01) 9/10/93 1/17/…… -
Adjust the size of the window dynamically in the JavaFX window to adjust the window size.
I have a task. I want to create four circles with four triangles inside, which is similar to a fan. I create a clock. …… -
Java – recursively tests whether the character array is a palindrome
I tried to find a solution, but all the solutions I found were strings What I want to do is check whether the characte……