Java
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Java – Eclipse: get null display
I tried to pop up a dialog box (i.e. a FileDialog) in the Eclipse Plug-in. In fact, I was running the relevant UI laun…… -
Java – find friends of all users: how to implement Hadoop MapReduce?
Say I entered the following: (1,2)(2,1)(1,3)(3,4)(4,1) The output is expected to be as follows: (1,(2,3,4)) -> (1,3…… -
Can I construct arrays in Java without the number of elements?
There are some problems when using arrays in Java If I declare a character array like this, my program will throw an e…… -
Java generics copy constructor
I want to write a copy constructor for a commonly defined class I have an inner class node, which I use as a node of a…… -
Can ColdFusion CFC be instantiated from Java?
I know that a Java class can be instantiated from ColdFusion, but can ColdFusion CFC be instantiated from Java code? F…… -
Gets the value selected from the radio button in Java
import javax.swing.*; import javax.swing.*; import java.awt.*; public class RadioButtonTest extends JFrame { privat…… -
Java – traversal object array list
I am using native SQL to query with the following code private <T> List<T> executeNativeQuery(String query…… -
Java – why can’t I use multiple type parameters with wildcards?
For example, why can't I do this (I1 and I2 are two interfaces): List<? extends I1 & I2> myList; Note that I…… -
Java – changing the value of an array through methods in class
This is my code: class Myclass { private static int[] array; public static void main(String[] args) { …… -
WinForms – why does mstest hang while waiting for windowsformssynchronizationcontext?
I have a custom windows forms control that contains mstest unit tests I added a @ r to this class_ 419_ 2271 @, I need…… -
Java compilation error: open enumeration
I encountered a very strange mistake and I couldn't figure out how to solve it Projects compiled well on Windows canno…… -
Java – object instantiation using factory methods
I am currently taking CS2 course (data structure), in which Java is the language used. I am interested in comparing an…… -
Java – download files using selenium
I'm using selenium to test the system My code is as follows: FirefoxProfile fxProfile = new FirefoxProfile(); fxProfil…… -
java. util. concurrent. ExecutionException:java. lang.OutOfMemoryError:PermGen space
everybody I encountered an exception while running the server. I think this is a memory leak! I tried a lot of paramet…… -
Java – unable to get unique list element
I tried to extract a unique element from the class list with the following format: [EntityClientPlayerMP['Player989'/2…… -
Java – can I use appium – webdriver to run applications from a laptop (MAC) on a real device (iPhone)?
I have implemented appium to run my test cases on the iPhone / iPad simulator Using the simulator: capabilities.setCap…… -
Java – how do I modify this program to use ArrayList?
First, the following is a description: As far as the code is concerned, I have completed all the contents required for…… -
Aggregate function on list in Java
I have a list of Java objects and I need to reduce it to apply aggregate functions, such as through database selection…… -
Generic producers and consumers in Java
I have this method to retrieve objects that are instances of a given class: public class UtilitiesClass { public …… -
Java – why use superclass references for objects?
See English answers > What does it mean to "program to an interface"? 32 public class Musician { public void p…… -
Java version for PMD, findbugs and checkstyle
I need to use PMD, findbugs and checkstyle as development projects in eclipse Is java 6 sufficient to use these tools?…… -
Java – pass some JUnit tests
Is there a simple way to tell JUnit that you only need to pass a certain percentage or a certain number of tests? I ma…… -
The Java compareto() method returns ClassCastException
Suppose I have an employee base class and a manager subclass, which extends employee Now suppose I create an object x …… -
Java – system Setout redirects back to standard output
System. Setout redirects standard output For example, FileOutputStream f = new FileOutputStream("file.txt"); Syste…… -
Can Java throw an empty reference to an exception?
See the English answer > why can I throw null in Java? 7 try { .... } catch (MyException e){ /*Can e be nul…… -
Java – libgdx actor draw overlay
I tried to override my player class, which extends the actor drawing method, but I received an error saying Why can't …… -
Java – speaker recognition using marf
I am using marf (modular audio recognition framework) to recognize the sound of speakers But I don't get the correct r…… -
The lambda expression example does not work in Java 8
I'm trying to learn lambda expression in Java 8 I did install the Eclipse Plug-in and Java 8 SDK, but when I tried to …… -
Java – comparable Super T > vs. comparable
I don't see any difference between this default sort method (from Java. Util. Collections) public static <T extends…… -
Java – exceptions to runtime optimization using openjpa MySQL
There must be many questions about this question. I have read some, but the answer is still not found I'm new to JPA. …… -
Java – information about @ inject in CDI / weld and di / Guice
I tried to distinguish between (some) CDI and di About @ inject, CDI (jsr-299) only brings di (jsr-330). What is it? C…… -
Java – lists implementations that do not resolve casts
I created my own array - based list implementation, and it doesn't limit invalid parameters If I use cast to create my……