Java
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Java – write toString () once and for all?
I want all my classes to implement toString () in the same way using java reflection I came up with two ways >Creat…… -
Java – how to manually map enumeration fields in jax-rs
How to map a simple JSON object {"status": "successful"} to Java enum in jax-rs automatically? public enum Status { …… -
DFA Based regular expression engine with captured Java
Is there any (free) regular expression engine for Java that can compile regular expressions into DFA and capture combi…… -
Java – why doesn’t class have a good generic type in this case?
In this code, why can't you declare a type as class? Extension b > public class Foo<B> { public void doSo…… -
Java – local or instance members
The following code proves that method1 is faster than method2 Anyone can comment on the reasons for this behavior clas…… -
Rxjava / rxbinding: how to handle errors on rxview
I use RX Java and rxbindings to view in Android Here's an example of what I'm doing RxView.clicks(btMyButton).flatMap(…… -
Java – detect mouse entry / exit events anywhere in JPanel
Basically, there is a JPanel. I want to know when the mouse enters the JPanel area and exits the JPanel area So I adde…… -
Different users under Linux are preferred for Java system
I try to run multiple JVMs (including Tomcat) of different users on a Linux frame I don't see too many problems, but i…… -
java – Gson：JsonSyntaxException on date
I tried to deserialize a JSON array using gson, but I'm getting a jsonsyntaxexception The JSON string is generated by …… -
Java – how to get crc64 distributed computing (using its linear properties)?
I need to spread over large files stored on distributed FS I can handle parts of the file better than the whole file, …… -
When trying to read a file in HDFS from Java, “wrong FS… Expected: File: / /”
I can't read files from HDFS using Java: String hdfsUrl = "hdfs://<ip>:<port>"; Configuration configuratio…… -
Multithreading – is the method pointer assignment thread safe?
Example: Suppose I have the following clues (please do not consider the contents used in the thread context execution …… -
Java – = and =
I've been misplaced = many times, I think I've always forgotten, because I don't know the difference between the two. …… -
Java – hotswaping code to “mvndebug Tomcat: run”
Usually I use mvndebug Tomcat: run to start Tomcat After the code changes, I need to use MVN Tomcat: redeploy This is …… -
Java – how to pass map parameters or objects to post requests through transformation?
I encountered a problem passing a map parameter or object to a retrofit post request I follow square, kdubb labs tutor…… -
Java. Java in JDK class lang.ref. Memory leak of WeakReference object
The following simple code reproduces Java. Java in the heap lang.ref. Growth of WeakReference objects: public static v…… -
Glassfish 3.1. 2 JDBC realm has a new password encryption algorithm field what is it?
The GlassFish JDBC realm has several different properties that you can set I'm interested in digest algorithm and pass…… -
Java – Maven compilation dies of “kill”
I run a large java project compiled by Maven 2 on a Linux virtual machine [debug] source source: [debug] / home / {...…… -
Java – hibernate search, Lucene or any other option?
I have a query to do Ilike on the size of string or text field (500000) in Table 11, but Ilike is obviously too large,…… -
Concurrency – Sinatra websocket Celluloid ID
Do any of you know how to run a quick code example of a Sinatra application running on celluloid: IO and use websocket…… -
Java – I should call ugi. before every action on Hadoop. checkTGTAndReloginFromKeytab()？
In my server application, I am connecting from my java application to the Kerberos secure Hadoop cluster I am using va…… -
Java – use notnull annotation in method parameters
I just started using java 8's @ notnull annotation and got some unexpected results I have this method: public List<…… -
The fastest and most effective way to search for key value pairs in Java?
Disclaimer: What is the fastest and least memory drain method for searching key value pairs? I will store items in a k…… -
Java applet – was it wrong today?
I have some extraordinary computing code that needs to be applied to the data downloaded into the browser Dom and obta…… -
Java sorting based on two columns
Say I have such a watch: String | Int1 | Int2 "foo" 5 0 "faa" 4 1 "zaa" 0 1 "zoo" 4 …… -
Java – generate random IP address
I want to generate some random IP addresses But the generateipaddress function returns 0.0 0.0 string as IPAddress But…… -
Java: have you ever seen a compiler or tool re-enter the last comma in the array initializer?
My mystery starts by thinking about the code: import java.util.Set; import javax.annotation.processing.*; import javax…… -
Is there a Perl implementation in Java?
I am looking for a Perl implementation in Java Jython is similar to python I need to run some Perl code in a Java clas…… -
java – Hibernate Session. Save() does not return a value?
The following code will throw a conversion error I'm new to hibernate Do not know why? Solution session. The return va…… -
Java How to synchronize getters and setters correctly?
If there are several mutable properties in an object that will be executed by multiple threads, I understand that they…… -
Java – there is no such method. There is an error when creating JUnit test
I have tried to find out this problem in the past two days, and I have no luck I'm just trying to create an annotation…… -
Java – pass parameters using GWT history?
I have a page called orders and a page called orderdetails As described in the excellent MVP tutorial, I am using hist……