Recent Posts
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SBT scaladoc configuration
I'm trying to configure scaladoc in SBT, especially the title, output directory and classpath I managed to pass in bui…… -
Java – use getspectrum() in libgdx Library
I know the first thing you do is "look in the document". The problem is that the document is not clear I use the libra…… -
Java – how to attach to AES encrypted files
I'm writing some recorders that generate encrypted log files Unfortunately, cryptography is not my strong point Now I …… -
Java – use okhttp to get HTTP status code
I'm using okhttp to get some website content However, I can't get the HTTP status code from the response My java code:…… -
How to find the maximum value of a given element in a HashMap using java 8 streams
I have a product HashMap Every product has a price I know how to find the product with the highest price But using jav…… -
Java – how to get the ID of automatic increment when I insert a record in the table through JDBC template
private void insertIntoMyTable (Myclass m) { private void insertIntoMyTable (Myclass m) { String query = "INSERT I…… -
Java – the best way to find the date closest to the target in the date list?
I have a list of date objects and a target date I want to find the date closest to the target date in the list, but on…… -
Java – NullPointerException in iabhelper In querypurchases
Today, I found an application crash report for Android applications involving the following stack traces: java.lang.Nu…… -
Java – how to print two positions correctly using the zero padding flag in a print statement
What if you want to print with zero pad int month,day; public void printNumeric() { System.out.printf("month +"/" …… -
How to write optimistic and pessimistic locking code from Java code
I know what optimistic and pessimistic locking are, but how do you do it when you write java code? Suppose I use Oracl…… -
Java – decomposes int values into different numbers
I want to divide my int value into numbers For example, if not It's 542. The result should be 5,4,2 I have two options…… -
. Net garbage collector
I've read a detailed article on the internal work of various garbage collectors in the JVM, but I'm finding it Net run…… -
How to quickly annotate a few lines of code in Java?
I want to test the runtime of some code blocks as follows: start = System.currentTimeMillis(); { ... this.dosome…… -
In the latest JDK7, using java failed hostname failed
I have got the host name of the machine as follows: InetAddress.getLocalHost().getHostName(); However, when I install …… -
Hash algorithm implemented by hash table
I am looking for high speed hash functions with good (i.e. near uniform) distribution for hash implementation Hash tab…… -
Java – how multithreading destroys the internal structure of HashMap
In Java 8, the really impatient Horstmann wrote: I can understand that unsynchronized concurrent access may destroy my…… -
Java – hibernate spatial index annotation
I use JTS geometry objects to store my geometry objects as Oracle SDO_ Geometry. However, when I want to use SDO_ GEOM…… -
Java – spring security MVC: same @ requestmapping, different @ secured
Suppose we have an API endpoint configured using spring MVC and spring security We want to be able to handle @ request…… -
Java – Convert byte [] to ArrayList
I have a byte [], which I get using object ArrayList Can someone tell me how to convert my byte [] to object ArrayList…… -
Bring JPanel in front of other objects (swing) in Java
I want to load when the app process is running, so I use JPanel on JTree But when the user clicks JPanel, JTree will s…… -
Java – there is a “global” Ctrl (skip to error) shortcut in eclipse?
Ctrl. Brought me an error in the file But if my error view gives me more errors, is there a shortcut to open the next …… -
Java EE enterprise applications: some actions for deployment / startup
See English answer > using special auto start servlet to initialize on startup and share application data1 thank yo…… -
Why does the nullprintstream() function in Java / Lang / system compare currenttimemillis() to zero?
When loading the system class, the < clinit > method instantiates the in, out and err printstream variables with…… -
Extracting human voice from wav file using java
I'm working on a project where I have to use Java from audio Extract human voice from wav file Audio WAV files may hav…… -
AspectJ: intercept method from external jar
I am using x.jar and adding it to my AspectJ project (in eclipse) I have written a pointcut and suggestion for the met…… -
How do I link two Java serialized objects together?
Sometimes (actually many), we get a Java case where two objects point to the same thing. Now, if we separate these ser…… -
Java – spring 4 – find the interface org springframework. test. context. Testcontext, but the class is expected
I began to get "find the interface org. Springframework. Test. Context. Testcontext, but the class is expected". Sprin…… -
Java – Design of objects and static methods
As shown in the figure below, there are two simple ways to make the streaming copier (Introducing Apache commons or si…… -
Java – how to run different jobs of Apache nutch in parallel
I use hen 2.3 All jobs run one after another, that is, the first generator, extraction, parsing, indexing, etc I want …… -
Java – does closing bufferedoutputstream also close the underlying OutputStream?
I call response Getoutputstream () streams binary data (extracted from the database as a CLOB CSV file) to the browser…… -
Java – reject hostkey: when deploying jars using gradle SSH plug-in
I'm trying to upload jars using gradle and use the gradle SSH plug-in: https://gradle-ssh-plugin.github.io/ Unfortunat…… -
What is the equivalent of c# the access modifier in Java and scala?
I used to work in c# before, and now I spend a lot of time working in scala and Java This can be confusing because acc……