Recent Posts
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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…… -
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…… -
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…… -
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…… -
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 – how to populate with a list?
I have a list < string > in the controller I pass to the view I need to fill in < form: Select > with thes…… -
Java – thread / handler error – the specified message queue synchronization barrier flag has not been published
I received this error – As a relative newcomer to Java / Android, there is no doubt that I missed something, but what …… -
How to initialize dynamic arrays in Java?
If I have a class that needs to return a string array of variable dimensions (and the dimension can only be determined…… -
Create repeated timer reminders in Java
I want a class that changes its private variables every 2 seconds I know if I do something import java.util.Timer; //.…… -
Can bufferedimage be converted into img data URI in Java?
I created a graphic image with the following example code BufferedImage bi = new BufferedImage(50,50,BufferedImage.TYP…… -
Java – converts the timestamp length to the normal date format
In my network application, the time of some activities of the user is stored as a timestamp in the database (in the da…… -
Java conventions for accessible data (public visitors and recipients / naming)
Through the Java API, you can see countless conflicting naming and practices, which is really confusing to me For exam…… -
Java – spring boot control target jar file name
My spring boot project has a build Description: <build> <plugins> <plugin> …… -
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 – 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 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…… -
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 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…… -
Java – how to pass a variable number of parameters to ant Exec
I have an ant target that accepts some variable parameters that can be passed to the exec task Using the old mechanism…… -
Java – Maven: compile and test at different source levels
I am currently developing a project to run on embedded devices The device runs Java ME JRE (equivalent to Java 1.4) Be…… -
How to map MySQL char (n) columns to instance variables using JPA / Hibernate annotations?
For the "language" column in the MySQL table of type char (7), I encountered a JPA / Hibernate mapping problem In my e…… -
Java animation clip when not moving the mouse cursor
I have a very simple animation, a large font of text constantly (pixel by pixel) moving to the left First convert the …… -
Java – powerful file transfer from mobile devices to servers
What I need is a file transfer solution (Library) from mobile devices (IOS, Android) to servers (PHP) The basic requir…… -
Java – how to make spring @ retryable configurable?
I have this code @Retryable(maxAttempts = 3,stateful = true,include = ServiceUnavailableException.class,exclude = URIS…… -
Executorservice with invokeall() and future in Java
Master the following codes: ExecutorService executor = Executors.newFixedThreadPool(10); Collection collection = n…… -
Java – the difference between enumerations and enumeration?
Are there any differences between enumerations? Extending zipentry > and enumerating < zipentry >? If so, wha…… -
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 – 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: 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 – 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…… -
java – SimpleDateFormat String
I have this code block, where dateformat The format parameter will always be a string, which is why I do this ToString…… -
Java – change the default XML namespace prefix generated using jaxws
I am using jaxws to generate a web service client for the Java application we build When jaxws builds its XML for use ……