包含标签：Java 的文章
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Java – interpret scientific symbols as int or float?
If I use scientific symbols (such as 1e9) to encode a number in my code, the type of the number will be (int, long, fl…… -
Java – MySQL jconnector on COM myql. jdbc. utils. ReadAheadInputStream. Spend 50% of the time in fill()
I'm profiling my application, which uses spring hibernate MySQL Java connector Visual VM shows that when 1000 parallel…… -
java. text. Strange behavior in simpledateformat, expecting yyyymmdd to give yyyy MM DD
When using simpledateformat to parse strings to dates, I encountered a very strange behavior Consider the following un…… -
Java – OutputStream outofmemoryerror when sending http
I tried to publish a large video / image file from the local file system to the HTTP path, but after a period of time,…… -
Java – the fastest way to insert a very large number of records into a table in SQL
The problem is that we insert a large number of records (more than a million) into a single table from a Java applicat…… -
Kotlin code compiled as jar for Java projects?
I wrote a Java library in kotlin, and I want to compile it into a jar that can be used by Java and kotlin applications…… -
Why do we need to use shift operators in Java?
>What is the purpose of using shift operators instead of division and multiplication? Solution Segmentation and mul…… -
Check is not empty in Java
Imagine that I generated an XML generated entity in Java, which contains some data I need <Car> <Engine>…… -
Java – inject EJB into eclipse link sessioncustomizer to provide Oracle schema name
In the Java EE 6 application running on GlassFish (3.1.2.2b5), suppose you have a configurationservice, which will rea…… -
How to control the width of jtextfields in Java swing?
I try to have several jtextfields on a single line, but I don't want them to have the same width How do I control the …… -
jsf – FacesContext. Getcurrentinstance() returns null in the runnable class
I tried to call FacesContext. in the run () method of the Runnable class. Getcurrentinstance() to get facescontext, bu…… -
Java-8 – why doesn’t map extend functions?
While using the new Java 8 stream API, I want to know why not: public interface Map<K,V> extends Function<K,V…… -
Java – how do I use the onejar Maven plug-in to set additional class path entries in the manifest?
Is there any way to use the onejar Maven plugin to add arbitrary classpath entries to the jar file manifest? I found t…… -
Multithreading – lockless memory reclamation with dangerous pointers
Hazard pointers is a technique for safely reclaiming memory without garbage collection and lock - free code The idea i…… -
Java – database design, without passing JDBC
I have a database design problem and I am facing one of my projects I try to implement a service, and part of this ser…… -
Java – the best way to implement a large state machine?
Basically, I have a state machine that controls the attack of game characters, and its time is based on the length of …… -
Java – can you write a constructor that does nothing?
To use class methods, I need to instantiate a class At present, this class has no constructor (so I want to write it) …… -
Java – how to clear jtextfield when the mouse clicks jtextfield
When the mouse clicks on the text field, I need to make the program clear the text from the text field I've tried some…… -
How to set the timeout with BufferedReader according to urlconnection in Java?
I want to read the content of the URL, but I don't want to "hang" if the URL doesn't respond I have created a Buffered…… -
Java – spring data elasticsearch: multiple indexes with the same document
I used spring data elastic search and everything was normal at first @Document( type = "products",indexName = "empty" …… -
Java – command button in JSF
How to implement the back button as a command button for general work? Unlike the back button, I don't mean the browse…… -
Java – the caller blocks until getfoo () has a value ready?
I have a java thread that exposes properties that other threads want to access: class MyThread extends Thread { pri…… -
Closure in Java – syntax differences between the three main proposals?
Three main schemes for adding closures to the Java language have been proposed: >Bgga (bracha gafter Gosling ah é) …… -
Java – Hibernate: cannot deserialize – invalid stream title
Any ideas about how I can solve this mistake? I am using spring JPA and hibernate Here are the necessary details Entit…… -
Java – how to delete XML version strings from strings
I've read the XML file and used the code given below – String XmlString = ""; String resourcePath=FilePathHelper.get…… -
Pure Java text interface for roguelike games
OK, that sounds like a crazy idea - but I'm interested in emulating the 1980s style roguelike game text interface in p…… -
How to override the toString method of ArrayList in Java?
I want to use the toString () method for ArrayList in Java However, even if I add such toString () to the class contai…… -
Compiler construction – will different JDK updates produce different Java bytecodes?
Scenario: I have a project whose source compliance level is specified as 1.5 Now I compile this project with two diffe…… -
How are enumerations internally represented in Java?
Java enumerations are classes They are compiled into classes How does the following example compile? What is "class"? …… -
Can Java applications detect whether the debugger is attached?
I know that the (JVM) startup option lets the JVM wait until the debugger is connected - that's not what I mean Can I …… -
Java – jax-rs Jackson Jason provider date format problem
Wrt found the following problems: Jersey + Jackson JSON date format serialization – how to change the format or use cu……