包含标签：Java 的文章
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How to use java to get all text files from a folder?
I need to read all ". TXT" files from the folder (the user needs to select this folder) Please tell me how to do it? S…… -
Java – how to dynamically change jlabel
I have a jlabel and a button. Jlabel displays the number of button presses, but I can't calculate how to update the jl…… -
If there is no system Out, what about printing on the console?
I recently encountered a problem in an interview The problem statement is – > assuming that you cannot access the s…… -
Java sliding jpanels
I have a menu showing various buttons. I can make the buttons call their respective jpanels when clicked The thing is …… -
How to centralize JavaFX controls
More specifically, why is my JavaFX control not centered? Here are two screenshots. The first one is after the beginni…… -
Java – writing files in clojure
I am using this function to write files in clojure (defn writelines [file-path lines] (with-open [wtr (clojure.java.…… -
Java NiO – memory mapped file
I recently encountered this article, which provides a good introduction to memory mapping files and how it is shared b…… -
Iterates over generic arrays of any type in Java
If there are Java collection instances that can carry primitive types, generic arrays, and / or iteratable collections…… -
Java 8 nested loop flow
Try to understand java 8 stream syntax through a simple example Look at other similar problems on this topic, but I ca…… -
Compiling java files using Java programs
Is it possible for programs written in Java to compile files using the JDK compiler (in addition to using java to open…… -
Can a java program know its current directory?
Can a Java application know its own current directory I am referring to the results of PWD For example, when executing…… -
Java – create a new instance class reference
I have an enumeration like this: public static enum TestEnum { // main ENUM_A (1,"test1",TestADto.class),ENUM…… -
Returns a list of nodes in a Java node. A parent node can have multiple child nodes
I'm trying to write java code to return a list of nodes in the tree The node class is class Node{ String label; List…… -
Convert object [] array to int [] array in Java?
There seems to be no simple way to do this, but this is what I have done so far. If someone can correct it, its work w…… -
Java – reset auto increment in H2
I'm testing a controller that returns a JSON response but doesn't @Before public void setUp() { Fixtures.deleteAll…… -
Java starts another Java application
I'm building a wrapper jar for the jar I built It will handle updating the main application and ensure that the user i…… -
Java regular expression, but matches everything
I want to match division * Everything except XHTML I have a servlet to listen to * XHTML, I want another servlet to ca…… -
Tyrus – simple java application – implementation class not found
I am developing simple applications to help me learn the concepts of websocket and Tyrus in Java This is my server (se…… -
Why do we prefer primitives and boxed primitives in Java
I'm reading the second edition of valid Java and page 23 // Hideously slow program! Can you spot the object creation p…… -
Java – HashMap return method
I have a method in my class, which initializes a HashMap and puts some keys and values in it, and then the method retu…… -
Where is setvisible in the Java – NetBeans palette?
I use NetBeans in design pattern to make a GUI I'm looking for a property corresponding to Java's setvisible method, a…… -
Gson, jsonelement, string comparison in Java
Well, I want to know that it may be very simple and stupid, but after a period of struggle, I don't know what happened…… -
Which to choose: 2D or 3D for java games
What should a small team choose for their first game when they are not punctual but ambitious? I am an experienced pro…… -
Java 8, lambda: sort in the grouping list and combine all into the list
Based on the following answers: https://stackoverflow.com/a/30202075/8760211 How to use study_ ID sorts each group, an…… -
Does Java – IllegalStateException apply to immutable objects?
You throw an IllegalStateException if: >The method cannot complete its work because of the value of one or more fie…… -
Java – can can can Guice automatically create instances of different classes according to parameters?
The standard object factory may be as follows: interface I { ... } class A implements I { ... } class B implements I {…… -
Java – eclipse link: there is no persistence provider named entitymanager
I want to create a bundle that can use Java persistence To do this, I created a plug - in project in eclipse In my pro…… -
Print * as triangle in Java?
My task in java course is to make three triangles One left, one right and one center I have to create a menu of why ty…… -
Java – spring singleton has been created many times
I have defined a bean in my spring web application. I want only one instance of this bean. This is my bean definition:…… -
Java – get HashSet from the key of HashMap?
I have a very large (100'000s entry) HashMap Now, I need a HashSet that contains all the keys in this HashMap Unfortun…… -
Java – using the comparable vs TreeSet list
Option 1: create a list that implements comparable and use collections. Net each time you add a value Sort (List L) so……