包含标签：Java 的文章
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Java – how do I check if a byte array is empty?
I am using the following code to get the uploaded file @POST @Path("update") @Consumes(MediaType.WILDCARD) …… -
Java – how to ignore attributes with null values during deserialization from JSON
I am trying to deserialize a JSON string into a concurrenthashmap object, and I receive an error because my JSON conta…… -
Random enumeration of hash tables in Ocaml
Sorry, it's a long question I decided to explain the background of the problem first, because my problem may have othe…… -
Java – can regular expressions be used for jetty’s servlet mapping?
I have this mapping <servlet-mapping> <servlet-name>service</servlet-name> <url-pattern>/servi…… -
How to use the system Use multiple scanner objects on in?
What is the correct way to use multiple scanner objects in my program For example, I use a scanner to read a file, and…… -
What is the most valuable Java object database?
The most valuable Java object databases are: >Easy to use: one line of code stores any object. > Effective memor…… -
Java – the eclipse debugger “skips” important code
I have a strange problem debugging Android applications // Get the puzzles from cache List<PuzzleDetails> newPuz…… -
Java – activate SQL statements using hibernate and spring data JPA
I have a spring data JPA repository that uses hibernate as a provider I want to record SQL statements, but I can't I'v…… -
Java – how to calculate an average using mongodb and numberlong
I tried to use the mongodb Java driver to calculate the average value of the collection, as follows: DBObject conditio…… -
Java – how to create gradle sharedmanifest for multiple projects?
I have several Java projects These projects use gradle to create jar, war, and ear files In each project, I use manife…… -
Prime factorization of Java display numbers
Therefore, for my task, I must write a program that requires the user to input an integer, and then print out the prim…… -
Java – ormlite – how to create objects and populate external collections?
I'm trying to create an object and populate the members of the external collection held by the object in an operation …… -
Java – how to set the canvas size?
I have a class called seatspanel. I draw seats in the OnDraw method (using drawRect) The OnDraw method uses canvas as …… -
Java server faces: validate only in the business logic layer
I have a java server faces web application and I'm not sure how to handle validation In my opinion, validation should …… -
java – Spring @Resource Handling
I'm at @ L_ 502_ There was a problem with the field annotated @ resource in the 0 @ bean Yes) I have: A field with set…… -
Java – number of recorders used
I am working with a very large Java application using log4j, and I wonder if there is a way to extract the number of a…… -
Use java to read files from the serial port
I'm a beginner in Java. I'm writing ("flash") GetBytes () like this to serialport Before I put flash_ After OK as a re…… -
Get the file creator / owner attribute in Java
I'm trying to read the file list and find the user who created the file With the * Nix system, you can perform similar…… -
Java – understand the order of elements in the stream generated from the HashSet
I read this official JAVA 8 document: Try to understand the above behavior through this code public class StreamOrderV…… -
Java Swing Mac OSX Preferences menu
I'm trying to add the Preferences menu to my java swing application, which proves a little disgusting I've read a lot …… -
Java – unit testing of methods that use mockito to call multiple other methods
Maybe I didn't do it at all in the search, but I can't find any documentation or discussion about how to write unit te…… -
Java – exact sum of long arrays
To get the exact sum of long [], I am using the following code snippet public static BigInteger sum(long[] a) { lo…… -
Java – CTR mode uses initial vector (IV)
As far as I know, CTR mode does not use initial vectors Other block cipher modes, such as CBC, XOR plaintext using ini…… -
Java – Concurrent HashMap: check size
Concurrent HashMap can solve the synchronization problem seen in HashMap Therefore, if we work with a synchronization …… -
java – Deflater. Deflate and small output buffers
I saw a strange situation, using java 8u45's small output buffer and Java util. Deflater. When the deflate (byte [] B,…… -
java – System. Is the value returned by currenttimemillis() affected by the day light savings and leap second adjustments?
I know system Currenttimemillis () gives the millisecond time since the era, and it is very sensitive to the system wa…… -
Java – handling new exceptions in anonymous inner classes
I have the following situations: /** Get a list of records */ public ArrayList<Record> foo() throws BazException…… -
Java – how to use the expectedexception rule to test multiple exceptions in a test?
There are questions about the usage of JUnit's expectedexception rule: As suggested here, the JUnit expectedexception …… -
Java – what is the best way to test this? Binary number with 4 positions
Consider the four input fields a, B, C and D on the web surface. Users can fill in any of these There are 16 combinati…… -
Is there any library that provides a smooth way to build Java format strings?
The syntax of Java format strings may become complex, for example: "|%1$-10s|%2$-10s|%3$-20s|\n" Someone has created a…… -
Java – how to make two classes share the same variable definition
What I really need is to be able to declare regular variables in the interface and implement the interface in two clas…… -
Java – unexpected results using repast Simphony
I need to use repast Simphony as a simulator to develop the Java version of the iterative prisoner's dilemma The idea ……