Java
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Java – fail fast iterator implementation
There are similar questions, but not exactly what I want to ask This link says that its implementation exists in the a…… -
Java – the data source JMX MBean cannot be unregistered when the spring boot application is closed
I have a simple spring boot application using org apache. commons. dbcp2. Basicdatasource as a datasource bean The dat…… -
Java – how to use the string list in namedparameterjdbc template to get the result
Try spring JDBC I use this as a reference I'm trying to get an actor with the same name Running this code gives me the…… -
Java – align swing components across panels
We have a JPanel that contains multiple jpanels containing jcomponents (let's say jlabels and jlabels) JText@R_540_241…… -
Java – remove the “Z” section from xmlregistry calender
When I like it below, GregorianCalendar calendar = new GregorianCalendar(TimeZone.getTimeZone("UTC")); calendar.setTim…… -
Java – change the default XML namespace prefix generated using jaxws
I am using jaxws to generate a web service client for the Java application we build When jaxws builds its XML for use …… -
Avoid multiple if statements in Java
I have written such a method But I think it should be refactored private String getMimeType(String fileName){ if(fil…… -
java – SimpleDateFormat String
I have this code block, where dateformat The format parameter will always be a string, which is why I do this ToString…… -
How does rxjava’s observable “iteration” work?
I started playing with RX Java and reactfx, and I became very fascinated But I have dozens of questions and I keep stu…… -
Java – what happens when we add two integer objects?
When we add two integer objects to Java, can anyone explain the internal behavior? (just like un@R_778_2419 @Object to…… -
How to use reflection to instantiate Java. Net using generics util. ArrayList
How to use reflection to instantiate Java. Net using generic classes util. ArrayList？ I'm writing a program that sets…… -
Java: a very simple scatter chart utility
I know there are many comparisons of java drawing libraries, but I can't find what I need I just want a simple and con…… -
Java-8 – always use cube-java8 to get exception “wrong type of constant pool index”
I am designing a sample project for Java 8 dialect My problem is that I didn't get it running I always get the followi…… -
Java – how to make the background activity smaller when opening the navigation bar?
I want my background activity to slightly open the navigation drawer to simulate the impact in the airbnb application …… -
Java – use the eclipse compiler in Jenkins to get compiler warnings / errors
I want to display eclipse compiler warnings in my Jenkins job Has anyone tried to use the eclipse compiler in Jenkins …… -
Java – converts a class object to a human readable string
Is there any way to automatically convert custom class objects to human readable strings? For example, consider the fo…… -
Java – place instance variable declarations
I've seen some developers put instance variable declarations at the end of the class, although I mainly see them at th…… -
Java – the difference between enumerations and enumeration?
Are there any differences between enumerations? Extending zipentry > and enumerating < zipentry >? If so, wha…… -
Java – convert e.printstacktrace() to use log4j instead
I'm new to log4j I don't want to display an exception stack trace in my log file, for example java.lang.IllegalArgumen…… -
Executorservice with invokeall() and future in Java
Master the following codes: ExecutorService executor = Executors.newFixedThreadPool(10); Collection collection = n…… -
Are there any open source java reflection tools or jars?
Are there any open source tools or jars to handle reflection in Java? I dynamically pass the method to a class, and I …… -
Java – how to make spring @ retryable configurable?
I have this code @Retryable(maxAttempts = 3,stateful = true,include = ServiceUnavailableException.class,exclude = URIS…… -
Java SFTP upload uses jsch, but how to overwrite the current file?
I tried to use jsch to upload two files to a server with SFTP If the directory is empty, uploading files works normall…… -
Floating point precision error in Java
I want to know what is the best way to fix precision errors in Java As shown in the following example, there is a prec…… -
Best practices and design guidelines for writing XML in Java?
Several times I have encountered a task that requires the production of XML (smaller) Every time I wander: What are th…… -
Java – if an exception is thrown, ensure that the object is closed
I'm creating JDBC statements and resultset Findbugs correctly points out that if exceptions are thrown, I won't close …… -
No Java util. List is implicitly converted to scala list
I'm interested in scala collection. Java conversions has a very basic problem I would expect the following code to wor…… -
Effectively implement Java Native Interface webcam feed
I am developing a project to receive video input from webcam and display the moving area to users My "beta" attempt in…… -
Java – combine two different types of observable
See English answers > rxjava merge observables of different types @Override public void call(String s,Boolean b) { …… -
Java – okhttpclient broke after updating retrofit to retrofit 2
This error occurred after updating from retrofit to retrofit 2 The LIBS version I use in my application is: compile 'c…… -
Java – saves the state of the WebView and reloads the location
I know a lot about this, but they seem old and no longer work - at least for me I try to save the location of the web …… -
The Java – JAXB XML adapter works through annotations, but not through setadapter
I know all about how to use xmladapters to convert unmappable types, or just change how some objects are serialized / ……