Java
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Java – fast double string conversion with given precision
I need to convert double to string with the given precision String. Format ("%. 3F", value) (or decimalformat) execute…… -
Java Card: how to load SIM applet into a real smart card?
I developed a Java card applet in eclipse and obtained a cap file Then I use jcmanager – Java secure card manager to l…… -
Java – how to obtain the column name of the primary key through JDBC
I have the following code: DatabaseMetaData dmd = connection.getMetaData(); ResultSet rs = dmd.getPrimaryKeys(null,nul…… -
Creating a console in Java
When I try to use Java lang.System. Console(), I get a null pointer I can still write and read from it, but this only …… -
Java – Custom httpmessageconverter in spring MVC
When implementing the restful API, I wrap all the data in one object to make it look like this {error: null,code: 200,…… -
Java – robolectric shadow does not work
I tried to create a test with robolectric My goal is to be able to replace the functionality of a class from custom be…… -
How to convert itextpdf documents to byte arrays
I need to convert the itextpdf document file into byte [] I have tested that I did not create PDF correctly The proble…… -
Java – call the destroy method of the servlet
According to link http://www.xyzws.com/Servletfaq/when-is-destroy-of-servlets-called/20 , one of the reasons for calli…… -
ORM – many relationships in laravel: belongstomany() vs. hasmanythrough()
What is the difference between using belongstomany() or hasmanythrough() when defining many to many relationships in l…… -
Creating a console in Java
When I try to use Java lang.System. Console(), I get a null pointer I can still write and read from it, but this only …… -
Java – digest authentication with Jersey client
I've written a rest web service with Jersey server (completely rock!) On the server side, I chose a digest authenticat…… -
Java – gson parsing dynamic JSON fields
I can't seem to figure that out I read several so posts (here and here) and my situation is a little different I'm not…… -
Java – fast double string conversion with given precision
I need to convert double to string with the given precision String. Format ("%. 3F", value) (or decimalformat) execute…… -
Java – NCSs type count violation
I am not quite clear about the violation proposed by PMD Basically, I have two questions: >What can I do to get rid…… -
Java – slf4j error: class loader has different types of class objects
Try to find out why I received the following error in the Tomcat log: Caused by: java.lang.LinkageError: loader constr…… -
Java – default type of HashMap for K and V
I usually type my map declaration, but I'm doing some maint and finding one without input It reminds me of (oh, no!) W…… -
Notes on learning the basic concepts of object-oriented programming in Java
Personally, the so-called class in programming is the same concept as the class in the classification of objects in th…… -
Java implementation of string matching (based on regular)
There is a string. How to query whether there are y and f characters in it? The darkest way is: Program 1: I know if, …… -
Method of connecting database and creating program using JDBC API in Java programming
JDBC connection database The programming involved in establishing a JDBC connection is quite simple. Here are four sim…… -
Explain the commit and rollback of transactions in Java’s JDBC API in detail
If the JDBC connection is in auto commit mode and it is in default, each SQL statement is submitted to the database wh…… -
Java binary file transfer based on TCP
A complete example of file transmission based on java socket protocol is completed based on TCP communication. In addi…… -
Java’s own tool jstack intercepts the stack information in the process
In the process of using java software, strange problems sometimes appear inexplicably. These problems are often unable…… -
Conversion method between char array (character array) and string type in Java
This article describes the conversion method between char array (character array) and string type in Java. Share with …… -
Explain the cache and secondary cache in the Hibernate framework of Java in detail
cache Today, let's talk about the entity state and Hibernate cache in hibernate. 1) First, let's take a look at entity…… -
Java method for counting the number of occurrences of a specified element in a string
This article explains the method of counting the number of occurrences of a string in the text or the number of occurr…… -
Sort out the basic descriptors and operators commonly used in Java programming
Descriptors are keywords you add to those definitions to change their meaning. The Java language has many descriptors,…… -
Java’s own messagedigest implements the MD5 encryption algorithm for text
In this article, the MD5 encryption algorithm for text is implemented by using the messagedigest provided by Java. The…… -
Summary of spring bean method in Java
Spring is a lightweight inversion of control (IOC) and aspect oriented (AOP) container framework. How to obtain spring…… -
Java operation ant compresses and decompresses files and packages anroid applications in batches
Zip / tar compression and decompression Java actually supports zip and other compression formats, but why do you use a…… -
Java uses gson to parse JSON data instances
JSON (JavaScript object notation) is a lightweight data exchange format, which is easy to read and write, and easy to …… -
Java exports all tables of the database to excel
This example shares the method of exporting all tables of a database to excel in Java for your reference. The specific…… -
The difference between serializable and Parcelable of intent transfer objects
Intent is widely used to transfer object data in different components. As we all know, there are two methods to transf……