Java
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Java – is sorting by a non transitive comparator “working”?
If I report to collections What happens if sort provides a non transitive comparator? Can I enter an infinite cycle? A…… -
Java – spring boot – how to specify an alternate boot class? (multiple entry points)
I want to add an alternative entry point to my spring boot application I'd rather think of it as a fat pot Is that pos…… -
Looking for 2D java games?
I am writing a very basic java game based on the idea of theme hospital I'm new to Java. I'm studying in college I hav…… -
Java – socket input stream is hung at the end of reading What’s the best way?
I'm a little obsessed with how to avoid my socket hanging on reading This is my code: Socket socket = new Socket("some…… -
Java – what is the purpose of calling type parameters in the new constructor?
In Java specification（ http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls -In 15.9), new has the follow…… -
Java – GWT developer plug-in for chrome and Internet Explorer – block installation
I am trying to install the GWT developer plug-in for Chrome (version 34.0.1847.131 m). I received the following error:…… -
What is the difference between navigableset, sortedset and TreeSet in Java?
TreeSet places elements in a natural sort or a comparator provided by Sortedset also maintains elements in natural ord…… -
Java – how to check whether the element in the int array is empty?
Example: I want to see if array [5] saves a value or is empty Solution Elements in the original array cannot be empty …… -
Nesting enumerations in Java
I want to nest some enumerations The object I represent is flags, with type and value There are discrete types, each w…… -
Java – why does one loop throw a concurrentmodificationexception while the other does not?
I encountered this problem when I was writing a travel salesman plan For the inner loop, I tried one for(Point x:Array…… -
Cassandra Java driver: how many touchpoints are reasonable?
In Java, I connect to the cussandra cluster as follows: Cluster cluster = Cluster.builder().addContactPoints("host-001…… -
Java – why (long) 9223372036854665200d give me 9223372036854665216?
I know the strange things of precision error, but I can't understand it, Why did the (long) 9223372036854665200d give …… -
Java – hibernate noob fetch join problem
I have two classes test2 and test3 Test2 has a property test3, which is an instance of test3 In other words, I have a …… -
Java – mockito style anyxxx unit test method
When unit testing some methods, some situations may occur. The value of some parameters is not important and can be an…… -
Java – sipdroid – another incoming call is not displayed, while another continues
I have installed sipdroid I made three accounts in sip2sip The question is: if I use SIP to call the same phone multip…… -
How to determine whether a Java class implements a specific interface
I'm trying to use reflection to determine whether the incoming class implements the iswdidget interface: public boolea…… -
Java – how to create a specific date in HSQLDB?
I need to create a high date in HSQLDB. The solution does not include me I need something similar Date(9999-12-31 0:0:…… -
Java – write a mat file instead of MATLAB header files and libraries
I have some data that I want to save to mat file (version 4 or 5, or any version for this) Capture: I don't want to us…… -
Java – how to speed up the build process using Maven tools
I use Maven as a build tool At present, I am doing the following construction Right click on the project - >maven c…… -
Java – can I press the jsup simulation button?
You can use jsup to submit a search to Google, but instead of sending your request through "Google search", you can us…… -
Java NIO Files. Createfile() failed with nosuchfileexception
I tried to put some core files in the dev - Test - prod setup Basically, if the document is newer, it needs to be copi…… -
Java – certificates need to be ignored when using resttemplate
I am sending a request to the following address The certificate is invalid. I want to ignore it I wrote the following …… -
Java – use generics in parameters of exceptions
I'm trying to store a collection of generic objects in exceptions and have trouble figuring out generics Specifically,…… -
Java – how to start GWT super development mode
There is already an answer to this question: > 5 super dev modes in GWT Now I can start using development mode, the…… -
The right way to use varhandle in Java 9?
I spent a lot of time investigating some new features of Java 9, but I didn't find any useful and practical examples C…… -
Java – access jar resources
I have a jar file and resources (mainly configuration cache, log, etc.) that I want to distribute I have a problem wit…… -
Java – spring welcome file list mapped correctly
I know that in spring, I must define the welcome file, which should be outside the WEB-INF folder, so I define it as f…… -
Java swing – running on EDT
I have a few questions about swing and use EDT to update the GUI I've just started reading this, so I'm a new beginner…… -
RSA encryption in Java: cross platform issues?
situation I am using RSA encryption in Java I am loading the data on HTC saphire (32b) developer's mobile phone with A…… -
Java – can Maven generate exe files and Mac OS X applications?
Let's say you created a java desktop application with jars and some dependencies and possible license text files I kno…… -
MediaPlayer. Java. In the displaying () method lang.IllegalStateException
public static MediaPlayer mp=null; public static MediaPlayer mp=null; public static void playGeneric(int name,final Im…… -
Use “this” and method (in Java)
What about using the "this" method in Java? Are there selective or mandatory situations? The only thing I encountered ……