Java
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Summary of experience of shift operator in Java
There are three shift operators in Java < <: shift left operator, Num < < 1, equivalent to num multiplied …… -
Spring implementation file upload (sample code)
In the actual development, we often encounter the function of uploading files to the server. Spring can inherit the Co…… -
Java stack class usage instance (usage method of stack in Java)
Java, using Java util. Create objects using the constructor of the stack class. public class Stack extends vector Cons…… -
Detailed introduction of decoration mode of Java design mode
1. Definition of decorator: also known as wrapper mode, decoration mode extends the function of objects in a transpare…… -
Java custom task class timed task execution example callable and future interface usage
Callable and future interfaces callable is an interface similar to runnable. The classes implementing callable interfa…… -
Discussion on the method of deleting duplicate elements in array in Java
Problem: for example, I have an array (the number of elements is 0 HA), and I want to add elements that cannot be repe…… -
Comparison between spring annotation configuration and XML configuration
Annotation configuration has many advantages over XML configuration: it can make full use of java reflection mechanism…… -
Specific examples of reading and writing Java IO stream files
introduction: The operation of Java IO stream is very common. It is basically used in every project. Every time you en…… -
App Engine java – Jersey / Jackson JaxbAnnotationIntrospector NoClassDefFoundError
I'm asking an unanswered question from Google's App Engine for Java, because I have exactly the same question ( origin…… -
Java – the array finds the second highest value
I have an array of 10 integer values Now I want to find out Solution No, it's totally impossible If you do not view al…… -
Java – what is the best way to parse dates in mm / DD / yy format and adjust them to the current / previous century?
One of our customers wants to be able to enter a date with only 2 digits in the year The date will be in the past, so …… -
Java – how to simulate object getClass？
I'm developing a java project and want to create one for dto Write a unit test using the equals method Yes In the equa…… -
A concise way to get the minimum and maximum values of Java 8 streams
Is there a simple way to extract the minimum and maximum values of the stream (based on some comparators)? It seems th…… -
Java – why do I need to handle thread Exception of sleep()?
To get this code for compilation, I can: >Put my phone number thread Sleep () is placed in the try / catch block, o…… -
Java – interface extends itself
I have used this website for about 6 months, and it's time to ask my first question, because I can't find the answer, …… -
Unable to send email from Java EC2 server
Try to send mail from Amazon EC2 server using java code, but you will receive an exception – Exception in thread "main…… -
Java – JPA query with case when in the where clause How do you do it?
How to use JPA to run the query shown below (it applies to pure SQL) SELECT t FROM table t WHERE ( CASE WHEN (( …… -
Get char value in Java
How to get the utf8 code of a char in Java? This is a table at more values I tried character Getnumericvalue (a), but …… -
Can I cheaply call a Java method to get the name of the current method?
Basically, I have a record statement in a method Whenever the method is called, I want to easily call the name of the …… -
How to create a help system in Java
We are developing new web applications and we must integrate help Does anyone know any good open source help applicati…… -
Java – why doesn’t the compilation of public API leaked internal types fail?
I have the following Java 9 modules: module com.example.a { exports com.example.a; } Use export type: public class…… -
Java – models, views, and controllers – what should be created?
According to good programming practice, which controller, model and view components should be created first at the beg…… -
Java – wsimport that optimizes multiple WSDL using common types
I'm working on a fairly large WS project involving more than 20 different web services Although these web services are…… -
Java – dynamically add projects to jcombobox
Vector combo@R_119_2419@Items = new Vector(); Vector combo@R_119_2419@Items = new Vector(); DefaultCombo@R_119_2419@Mo…… -
Java – an iterator that transforms and returns the same object Bad practice?
I wrote GC friendly code to read and return a series of byte [] messages to the user Internally, I reuse the same Byte…… -
Signal processing – why do convolution results have different lengths in frequency domain vs frequency domain?
I am not a DSP expert, but I understand that there are two methods to apply discrete time domain filter to discrete ti…… -
Java – what is a view of a collection?
I've been reading the terminology view while using the guava series and reading its documentation I have sought an exp…… -
Java – servlet filters all requests
I want to know how to use the web Set a filter for each request call in XML? Solution Just create a filter and map it …… -
Java – how to test code written for AWS API
I am writing an application in Java to upload a file to AWS S3 The file will be provided to the application in the for…… -
Java – how to force Maven mojo to be executed once at the end of the build?
I have a mojo that I want to execute once, once only after the test phase of the last project in the reactor use: if (…… -
Java – what’s the best place to start learning servlet / Tomcat?
I need to start developing servlets / JSPS and Tomcat I need to speed up What would you suggest to get up faster? Ther…… -
Converting XML files to CSV in Java
@Before, there may be some repeated questions and suggestions. I don't think this is the first time. Please be as brie……