Java
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Java – define the concept of “port” in UML composite structure diagram
In UML composite structure diagram: what is "port"? How can I implement one, such as Java? Solution I will point out t…… -
What library do I need, so I can visit this com. Com in Java sun. image. codec. jpeg？
I created an image watermarking program in Java. I imported the following contents: import com.sun.image.codec.jpeg.JP…… -
Which Java collection should I use to implement thread safe caching?
I want to implement a simple cache without too much work (NATURAL) In my opinion, one of the standard Java collections…… -
Java – using jquery-1.7 1.min. JS compilation error
I'm trying to run dynamic web projects using Maven and spring I have one using jquery-1.7 1.min. JS code But I see com…… -
Java – @ size, @ length and @ column (length = value)
What is the difference between the validation check of the following three fields? @Entity public class MyEntity { …… -
Java – how to map a set of string objects using JPA annotations?
@Entity @Entity public class TestClass implements Serializable{ private Integer id; private Set<String> …… -
Java – unit testing, static and factory
I'm implementing a model in Java. It needs to iterate a set and go through some identification stages. It involves loo…… -
What Java data type corresponds to Oracle SQL data type numeric?
Oracle jdbc driver assigns Java data type to Oracle SQL data type numeric? Does this vary with the size of the numeric…… -
Java – find out which classes use a given API
In my java project, I want to find out which classes use the given API from the program Is there any way to do this? C…… -
Java – I can kill or complete () an activity in a thread other than a thread?
I wonder if it is possible to create a thread and kill / complete the activity, if so, how can it not work in the doin…… -
The Java implementation of producer consumer throws Java lang.IllegalMonitorStateException
import java.util.LinkedList; import java.util.LinkedList; import java.util.Queue; class Producer extends PubSub imple…… -
Java – why do anonymous classes catch “this” even if they don’t need it?
In view of this Code: class Foo {} public class Test { public Foo makeFoo(String p,String q) { …… -
Java – resource leak: ‘in’ has never been closed, even though it is closed
I know there are several similar problems here, but most people have forgotten to put a close () instruction in their …… -
javax. imageio. Is imageio broken? It rotates some images
Below you will see a delicious cake "simit" from Turkey It's taken from the iPad 2, so it's a JPEG with a size of 720 …… -
The keylistener event is obviously not triggered in the Java applet
I've just started learning to program applets and Java GUIs. I'm trying to make a simple game At present, I have main …… -
Java – ThreadPoolExecutor: how does it reuse threads
I read about ThreadPoolExecutor wired process pool, which is destined to reduce the cost of creating new threads (at l…… -
Java – spring data repositories – find the where field in the list
I am trying to use spring pagingandsortingrepository and find myentity, where the fields in fieldvalues are queried as…… -
Java – last inserted value in DB
There is already an answer to this question: > how to get a value from the last inserted row? 14 When I insert a ro…… -
Java – what is a good combination of tools currently used to implement rest / J2EE / database custom authentication
I just want to know what is the good combination of tools / frameworks / libraries for implementing rest API on J2EE a…… -
JavaFX bean binding suddenly stops working
I use JavaFX numberbindings to calculate certain values At first, everything worked as expected However, after a fairl…… -
Embedded – how to debug unexpected resets in STM32 devices?
I'm doing some development in C using stm32f107 chip, and sometimes when I call a specific function, the device starts…… -
Java – MapReduce / Hadoop getting started
Recently, I have read a lot of information about MapReduce / Hadoop and think this is where the industry is turning Ca…… -
Java – how to access enum field in playframework template
I have an enum, which has some fields that I need in play1 2.4 access in template public Enum WORKER{ FARMER,SMITH,…… -
Java – how to return specific types when implementing a common interface
I have an interface that will be implemented by several different classes, each using different types and return types…… -
How to create an OAuth request using Java?
I need to use OAuth to connect with viago website Referring to their documentation, I need to create a request similar…… -
Java BigDecimal triangulation
I am developing a mathematical parser that can evaluate strings, such as' 5 b * sqrt (C ^ 2) ' I am using ANTLR for pa…… -
How to map lambda expressions in Java
I come from Python and try to understand how lambda expressions work in Java In Python, you can do the following: opdi…… -
In Java, there is no two – to – long conversion
I need to convert double to long and keep its binary structure instead of numeric value Just change the type, but keep…… -
Java – how to add support for resizing when using an undecorated JFrame?
I want to customize my title bar, minimize, maximize and close buttons So I use setundecorated (true); On my JFrame, b…… -
Warning: jsf1074: a managed bean named “bean” has been registered
I'm using mojarra JSF 2.2 The bean we define is based on anonation, for example @ManagedBean(name = "codeBean") @ViewS…… -
Java – JPanel does not use SetSize and setprefferedsize
Please explain why it doesn't work. You can also publish a solution to solve this problem Thank you very much for your…… -
What is jar signing in Java?
What is a jar signature? Can we customize it? I mean, have your own signature Solution Jar signature is the process of……