Java
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Check whether the user is root in the Java application
How do I verify that the user is root in a Java application? thank you Solution Simple Just use System.getProperty("us…… -
JPA2. 0: delete entity in onetomany relationship
How to delete an entity in a onetomany relationship @Entity @NamedQueries({ @NamedQuery(name="User.findByUserNamePa…… -
selenium – org. junit. Test and JUnit framework. Differences between test packages
<project name="JunitSuite" basedir="." default="clean"> <project name="JunitSuite" basedir="." default="clean…… -
Java bitwise operation
I have this line of code int b1 = 0xffff & (content[12]<<8 | 0xff & content[11]); I have a small bytearr…… -
Java – button click causes the application to crash
I just set up an onclick method, which is written in the activity class and will be called as soon as I click the butt…… -
How to output the content of scene graphics in JavaFX 2 to images
How to output the content of scene graph in JavaFX 2 to image In fact, I'm developing an application that basically de…… -
Java – singleton mode
Like my previous question, this question refers to effective Java I have many sub - questions this time >Privileged…… -
. Net – how to stop a worker thread in a multithreaded windows service where the service is stopped
I have a Windows service that uses a producer / consumer queue model to process tasks in queues with multiple worker t…… -
Java – how to use jmockit to pass an empty string to a private method during unit testing?
The following is the private method in my datatap class. I tried to JUnit test this private method with jmockit – priv…… -
Java – how to put Google Adsense in GWT
Does anyone know how to put Google Adsense ads in GWT web applications? Solution You can put the JavaScript code in Ad…… -
Deleting XML nodes using a Java parser
In the following example XML, if a Java parser is used, if e = 13, how to delete the entire B node <xml> <…… -
How to use Java comparator correctly?
If I have the following courses: public class Employee { private int empId; private String name; private i…… -
Java – how to use polynomials instead of bits to improve performance?
I have a 128 bit string, and my supervisor asked me to express the 128 bits as polynomials This is a scan of the paper…… -
Java – use Jackson to map objects from specific nodes in the JSON tree
Can Jackson's objectmapper ungroup from a specific node (and "down") in the JSON tree? Use cases are extensible docume…… -
How to convert ieee-11073 16 bit sfloat to a simple floating point number in Java?
The title is self-evident: how to convert ieee-11073 16 bit sfloat to a simple floating point number in Java? Solution…… -
Draw lines on the canvas with the mouse: Java AWT
The attempt is to draw a figure (now a line) with the mouse on the AWT canvas I tried java graphics for the first time…… -
java – joda-time：new DateTime(String)vs DateTime. parse(String)
Using the joda-time-2.0 version library, I want to know which function is more suitable for building from ISO date (up…… -
Java – badtokenexception: cannot add window
I have a problem. When the screen times out, I receive a badtokenexception, and then the user returns to my applicatio…… -
Multithreading – avoiding cache consistency problems and key parts in Delphi?
I just read an MSDN article "synchronization and multiprocessor issues", which solves the memory cache consistency pro…… -
JavaFX tableview resizes to fit the window
I'm trying JavaFX and forcing my way because it's hypothetical and future I'm trying to create a 4 - column table The …… -
Java – using paint Setstrokejoin() and paint setStrokeMiter()
I am curious about what these methods do and how to use them, because there seems to be no detail except the single se…… -
Java – you cannot avoid using spring boot and logback to log SQL into the console
Solution If hibernate show_ If SQL is set to true, hibernate will simply print the SQL statement to the console (do no…… -
Java: XML normalization
What is the simplest way to make the canonical form of XML files in Java? Do you have some complete code? I have found…… -
Java – display HTML5 in swing
There are many questions about displaying HTML content in swing applications But no library supports HTML5 (I can't af…… -
Subdivision objects in Java
I have a huge object. Of course I have its class. I extract some values from it, but because it's really big, I don't …… -
Java – how to set the context path in Tomcat so that you can enter the site without attaching the deployed folder name?
I read some questions about this in the Tomcat guide here I think I do almost the same thing But to some extent, it ca…… -
Java – the background color of the selected item in the non editable jcombobox
Non editable JCombo@R_382_2419 @The background color selected in is a blue color: Is there any way to make it a differ…… -
Java – how to reduce the “cyclomatic complexity” of the following code
I want to know how to reduce the cyclomatic complexity of the following code, if this is something I should worry abou…… -
In Java, when is the constructor of an enumeration constant called?
To use a creative example in Java, here is the code: enum Commands{ Save("S"); File("F"); private String sho…… -
Files. Parallel version of walkfiletree (Java or Scala)
Does anyone know java files Any parallel equivalent of walkfiletree or something like that? It can be a Java or Scala …… -
Java – why doesn’t Jackson 2 recognize the first capital letter if the leading camel case word is only one letter long?
I am using spring 4 MVC with Jackson 2 my service For one of the operations, I have a request object with an attribute…… -
java – Collections. synchronizedMap(new LinkedHashMap()); Map thread is not made safe
I am using the following construct to create a thread safe map Collections.synchronizedMap(new LinkedHashMap()); Altho……