包含标签：Java 的文章
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Java – Hibernate: how to use concat and group_ CONCAT
How to use concat() and group in HQL queries_ CONCAT()？ Solution About concat: its working principle is the same as t…… -
Java – why is anyvalue% 1 “stupid math” double anyvalue in sonar?
Sony math should not be performed Explanation In my case, anyvalue is a double This is as intended for me The followin…… -
Java – what is the best way to find all addresses at a specific distance from the selected point?
I'm developing an application that should display addresses in specific locations I know how to find the distance betw…… -
Removes a specific character from a string in Java
For example, when we specify the character to be deleted as aeiou, we give a string of "vowel war": Hawaii vs. groney,…… -
Java – application engine data storage: how to implement posts and tags without connection?
I am building an application in Google App Engine (Java) where users can post. I am considering adding tags to these p…… -
Java – the job gives an unexpected answer
Today, I encountered the following problems, and I can't seem to find a solution: int i,j,k; i = j = k = 3; i = k++;…… -
Java – how to learn jsp / MVC, previously in ASP Net MVC?
I'm just beginning to enter the Java world In the past three years, I have been in c# programming and have been doing …… -
Java – slf4j log level as a parameter
There is already an answer to this question: > setting log level of message at runtime in slf4j11 Logger.log(Level.…… -
Java – how do I know the number of worksheets in a workbook?
I use the HSSF API to read data from XLS files But there is no way to get the exact uncertainty Worksheet in workbook …… -
Java – the strange “reduce” method group is in the jdk8 batch collection operation library
Why does the new jdk8 stream class only contain the following reduce methods: T reduce(BinaryOperator<T> reducer…… -
Java 8: find the index of the minimum value from the list
Say I have a list of elements (34,11,98,56,43) Using the Java 8 stream, how do I find the index of the smallest elemen…… -
Java – generate thumbnails of websites?
For my application, I need to dynamically create thumbnails of the website So far, I have such code from so: public cl…… -
Java priority of multiple operators
This is more a theoretical problem to understand Java's evaluation of arithmetic operations Since and – have the same …… -
Java – NullPointerException when trying to run Jar file
I've just started learning Java and only know a small amount of code, but it's still a simple program This is a prank …… -
Java – major. Not supported on Mac OS X El capital Minor version
Following the incorrect solution of Java in the major and minor versions of El Capitan, I see several solutions that e…… -
Java – how to write InputStream to a file using NiO?
I write InputStream to a file in the following ways: private void writeToFile(InputStream stream) throws IOException {…… -
Bluetooth connection failure “java.io.ioexception: read failure, socket may be closed or timeout, read RET: – 1”
I'm trying to connect to the device through an application installed in nexus 5 I want to make an application like rai…… -
Java – two different preparation statements in a single batch
I want to send two different prepared statements in a batch I'm currently doing two things. You can see its role in th…… -
Java – sends a post request using a user name and password and saves a session cookie
After sending a post request with a user name and password, how do I save cookies using jsup? Or do I have to provide …… -
Java – implementing thread pools in services
I'm trying to implement a service that will perform some work on several parallel threads when requested My implementa…… -
Java – ant waiting for file creation
Can ant be configured to pause the build process until the file is created (with a relative timeout)? Solution <wai…… -
Java – how to create a hazelcast instance embedded in process memory without networking?
In my unit test, I want to create an embedded (in-process / in memory) hazelcast instance that does not attempt to sta…… -
Jpa-2.0 – the @ manytoone relationship cannot be empty
I have a one-on-one relationship and I want to be free: @ManyToOne(optional = true) @JoinColumn(name = "customer_id",n…… -
Multithreading – runspace problem with PowerShell: downloadfileasync
I need to download files using webclient in power shell 2.0. I want to display the download progress, so I do this: $a…… -
Java – what is a hibernate dirty session?
I wonder if anyone can tell me what a hibernate dirty session is? I seem to have a problem with standard queries when …… -
Integer in Java ParseInt, when ” is the first exception
Integer parseInt( “ – 1000”); Returns - 1000 as output Integer. parseInt(“500”); Throw exception How can we recognize …… -
Java – how to print exceptions using logger?
I have a situation where I want to use the logger to print all exceptions caught in the catch block try { File…… -
How does the Java – immutable object help reduce the overhead caused by garbage collection?
I'm a novice. I've seen garbage collection in the previous two answers here Now, even if programmers have to create ne…… -
Using Java objects as clojure mappings
I have a Java class that I want to use in clojure But I want to use it as a clojure map What steps are required to do …… -
Java – convert a C long type to JNI jlong
I use JNI to transfer data between C and Java I need to pass a "long" type and use something like this: long myLongVal…… -
Java – SSL connection reset
I tried to connect to an HTTPS endpoint via Java Each method I tried (more details below) eventually generates this st…… -
Java – spring data JPA If no result returns the default value, find max
I implemented in my spring repository interface: @Query("SELECT max(ch.id) FROM MyEntity ch") Long getMaxId(); If DB i……