包含标签：Java 的文章
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Java streams: get value groups through internal map keys
I have map < A, map < B, C > > and I want to get map < B, list < C > > from it using java stre…… -
Java – why should the value of an annotation attribute be a constant expression?
I have the following code @UIUnitTimeout(8*60*1000) // works @UIUnitTimeout(TimeUnit.MINUTES.toMillis(8)) // does not…… -
Type javax servlet. ServletContext and javax servlet. ServletException cannot be resolved
I'm trying to include spring security in my web project, and I'm following this tutorial http://docs.spring.io/spring-…… -
Java 8 stream filters the values in the list
I have an object that looks like this class MyObject { String type; List<String> subTypes; } Is it pos…… -
Java – query returns multiple result sets
I have an MSSQL database and am running the following query: select * from projects; select * from user The above quer…… -
Java – add token to Lucene tokenstream
I wrote a tokenfilter, which adds tokens to the stream Tests show that it works, but I don't fully understand why I wo…… -
Java – perform UPnP scan without returning to Philips hue Bridge
I tried to implement my own UPnP scan. It mainly works and proves that this is not me. I have a Windows program that a…… -
Java – inherit JPA and Hibernate issues
I have a strange problem loading some objects I use JPA 1, hibernate core version 3.3 0.sp1 and hibernate entitymanage…… -
Java – two related enumeration mappings?
I have two related enumerations Enum1： public enum HttpMethodName { GET,POST,PUT,DELETE; } Enum2： public enum …… -
Java – avoid generic forms foo >
I often find myself writing generic class definitions for forms public class Foo<ActualType extends Foo<ActualTy…… -
Is there any way to reinitialize a static class in Java?
I try to unit test a class that references static data from another class I can't "not" use this static class, but obv…… -
Multithreading – upgrading threads using CLR
Using Visual Studio 2008 and boost library 1.46 1 I want to compile and link the following and / or CLR flags: #includ…… -
Java dateformat illegal pattern character ‘y’
We recently made a strange error in the production environment (the test environment works normally) java. Lang. illeg…… -
Java – how do I get file types on Mac OS X?
I use this code to get the type of file – FileSystemView filesystem = FileSystemView.getFileSystemView(); String sFile…… -
Java – Etag processing in spring MVC rest
I am considering switching from Apache CXF RS and Jax rs to spring MVC rest, and look at some problems in the way spri…… -
Java executor: how do I stop a submitted task?
I have submitted a task using the actuator and I need it to stop after a period of time (e.g. 5 minutes) I've tried th…… -
Java – JSF 2 – bean validation: validation failed – > null value is replaced by the last valid value from the managed bean
I don't understand the behavior of jsf2 during the price period I hope someone can help me I have a form in which the …… -
Java hibernate uses addentity to create sqlsql
I need to apply SQL queries similar to this SELECT id as id,c03 as c03,c34 as c34 FROM (SELECT id,c03…… -
Java – JSON mapping exception cannot deserialize an instance to start_ Array token
I tried to parse my JSON request to my model I don't know what's wrong with this code The syntax of JSON is also corre…… -
Java: different double compared with double
I know that double is a wrapper class that contains even numbers Today I see another major difference: double a = 1.0;…… -
Java – name a loop
While browsing through questions and answers on this forum, I found that a piece of code was given loops to use them f…… -
Does the java compiler optimize repeated mathematical calculations?
The java compiler optimizes simple repetitive mathematical operations, such as: if (prevX / width != curX / width) { …… -
Java – escape in FreeMarker by default
In the FreeMarker template, we can use the escape instruction to automatically apply escape to all interpolation in th…… -
Extend a Java ArrayList
I want to extend ArrayList to add several methods for a specific class, and its examples will be saved by the extended…… -
Java – Hibernate: delete many to many associations
I have two tables associated with many to many – DB segment: Load ID name Meeting Id date sessionsloads LoadId SESSION…… -
Mp3 coding in Java
I need an opensource API in Java that can convert * WAV and * Au format is encoded as MP3 and vice versa I have evalua…… -
Java – polymorphism of member variables I know it’s impossible. I don’t understand the specific situation
I know this behavior, but I'm not 100% sure why it happened class Animal{ String name = "Animal"; public voi…… -
Java – how to extract values from JSON
I get a response string from the server, as shown below {"name":"Json","detail":{"first_name":"Json","last_name":"Scot…… -
Java – Atomic increment of long variables?
If the long variable is declared as: – Long counter = 0; Now, if I use the pre increment operator to increment it, is …… -
Logical solution algorithm (applicable to Sudoku in Java)
I have a problem with my logic algorithm It solves the problem of a large number of hints, which is only a problem wit…… -
Java – can jmenubar be added to the decoration window of JFrame?
I want to know if I can add jmenubar to the decoration window of JFrame or jrootpane, or if I can include the border i…… -
Java – used to define the disadvantages of non static recorders
How do you reduce Java logging boilerplate code? It is strongly recommended not to use recorders as instance member va……