Java
-
Spring – JPA and Dao – what is the standard approach?
I am developing my first application using JPA / Hibernate and spring My first attempt in Dao class looked like this: …… -
Java – why do anonymous classes access non final class members of closed classes
We know that the final local variables can only be accessed in anonymous classes. Here is a good reason: Why are only …… -
rx-java – RxSwift – . subscribe vs . What’s the difference between subscribenext?
What is the difference between these two operators? http://reactivex.io Don't mention it subscribeNext. Solution In rx…… -
Java – PDF file download using BlockingQueue
I'm trying to download a PDF file using urlconnection Here is how I set up the connection object URL serverUrl = new U…… -
Can you help me collect the online material collection of Java best practices?
I work in a medium-sized development team and maintain a web application written in Java 1.4 for 8 years For new devel…… -
How to instantiate the Java Boolean wrapper class?
In Java, I can write code like this Boolean b = true ; It will work. I now have an object with a value of "true" How d…… -
Java generic parameters are scoped to any type
Is there a syntax or solution to restrict generic type parameters to any type? I know you can limit types to all types…… -
Delete the first element of stream in Java 8
I have used java Files in NiO library The walk () method generates a stream in Java 8 The problem is that the method c…… -
Why does my java custom cell renderer not highlight when rows / cells are selected?
I have a custom cell renderer to wrap cells with words, so more content can be read This is the code: import java.awt.…… -
Java – why HashSet RemoveAll requires secondary operations?
I have this code to generate a HashSet and call removeall() I made a Class A, which is just an int wrapper. It records…… -
Java heap analysis and OQL: counting unique strings
I do memory analysis on the existing Java software There is an SQL 'group by' equivalent in OQL to view the count of o…… -
Java InputStream. Read (byte [], int, int) method, how to block until the exact number of bytes is read
I am writing a simple client / server network application to send and receive fixed size messages through TCP sockets …… -
Java saxparser: different from ‘localname’ and ‘QName’`
In Java, the handler class contains a method named startelement The this method has a prototype: Public void startelem…… -
Is there a for Java application server Net simulation?
There is something in the Java community called Net? Similar to tomcat, resin and jetty I'm not interested in JSP equi…… -
Multithreading – dual locking mode in C 11?
The new model of C 11 allows multiprocessor systems to work reliably, wrt Reorganization order As Meyers and Alexandre…… -
Java – how do I determine the length of a graphic string?
I'm creating a graphical timeline from an excel document. I need to add a small label of the event name next to the ta…… -
Java: how to replace the last 16 bits of long with short
I have a long, short time Ex (divided into 16 bit blocks for ease of reading): > long = 0xffff 0xffff 0xffff 0xffff…… -
Java – what version of JBoss am I running?
(as the question:) how do I know what version of JBoss I am running? I'm also curious about what version of Tomcat I'm…… -
How does rxjava’s observable “iteration” work?
I started playing with RX Java and reactfx, and I became very fascinated But I have dozens of questions and I keep stu…… -
Java – what happens when we add two integer objects?
When we add two integer objects to Java, can anyone explain the internal behavior? (just like un@R_778_2419 @Object to…… -
How to use reflection to instantiate Java. Net using generics util. ArrayList
How to use reflection to instantiate Java. Net using generic classes util. ArrayList？ I'm writing a program that sets…… -
Java: a very simple scatter chart utility
I know there are many comparisons of java drawing libraries, but I can't find what I need I just want a simple and con…… -
Java-8 – always use cube-java8 to get exception “wrong type of constant pool index”
I am designing a sample project for Java 8 dialect My problem is that I didn't get it running I always get the followi…… -
Java – how to make the background activity smaller when opening the navigation bar?
I want my background activity to slightly open the navigation drawer to simulate the impact in the airbnb application …… -
Java – use the eclipse compiler in Jenkins to get compiler warnings / errors
I want to display eclipse compiler warnings in my Jenkins job Has anyone tried to use the eclipse compiler in Jenkins …… -
Java – converts a class object to a human readable string
Is there any way to automatically convert custom class objects to human readable strings? For example, consider the fo…… -
Java – place instance variable declarations
I've seen some developers put instance variable declarations at the end of the class, although I mainly see them at th…… -
Java – the difference between enumerations and enumeration?
Are there any differences between enumerations? Extending zipentry > and enumerating < zipentry >? If so, wha…… -
Java – convert e.printstacktrace() to use log4j instead
I'm new to log4j I don't want to display an exception stack trace in my log file, for example java.lang.IllegalArgumen…… -
Executorservice with invokeall() and future in Java
Master the following codes: ExecutorService executor = Executors.newFixedThreadPool(10); Collection collection = n…… -
Are there any open source java reflection tools or jars?
Are there any open source tools or jars to handle reflection in Java? I dynamically pass the method to a class, and I …… -
Java – how to make spring @ retryable configurable?
I have this code @Retryable(maxAttempts = 3,stateful = true,include = ServiceUnavailableException.class,exclude = URIS……