Java
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Java – why call a method call that takes a parent class as a parameter instead of a method that takes a child class as a parameter?
I have a class named a and a class named B, which extends a public class Main { public static void main(String[] a…… -
How does Java – class object relationships work?
What happens when we create an instance of a class? I mean, every field and method of the class will be inside the obj…… -
Java – how to copy “show tables” in Hibernate?
I'm trying to iterate over all my tables, so I can truncate each table (at the beginning of each jbehave test) I thoug…… -
Java – Generic ChangeListener
Scenario: I have a container object that contains a mixed object package. All objects inherit from the mycontainerdobj…… -
Comet programming and ASP net
If an event occurs on the browser, I want to push the data to the user's browser We can do this using commet programmi…… -
How to correctly format SOAP message envelopes using a custom soaphandler
I have a class that implements soaphandler interface Handlemessage is defined as: public boolean handleMessage(SOAPMes…… -
Java – represents Association and inheritance in UML
If I have a class definition similar to the following: class A extends class B { private B b } How can I express this …… -
Java – I use generics, but not this class!
I tried to use Google collections to call this method to connect two arrays public static <T> T[] concat(T[] fir…… -
Java – hibernate – entity manager factory
I recently encountered a problem that my web application can't start normally, and the stack trace can't tell exactly …… -
Java – how to get enumeration values from attributes
I have an enumeration with values valid and invalid, which has Boolean attributes associated with it I want to get the…… -
Java – how can I guarantee to send a “stay alive” heartbeat?
We have an RMI client application written in Java that needs to send "keep alive" messages to the server application r…… -
Java – deploy spring based war and externalize its jar dependencies
I have a spring application that has many dependencies (18 megabyte jar files..) – Now, when I test on a remote Tomcat…… -
Java – eclipse – sonar s2629 may have false positives with new strings
I'm using the latest eclipse and sonar plug-ins Record the following lines in answer: log.debug("Request body: {}",new…… -
How to use helvetica in Java?
Helvetica is available in one form or another on windows, Mac OS X, and Linux Under windows, I can see it from Microso…… -
Java – how do I add an array in the middle?
I try to create a method named insertat, which accepts three parameters (int index, int n, int value). If I call: Int …… -
Java development standards and tools (compared with c#)
I don't know anything about the Java platform. I want to know what tools (and methods) can be used to help develop mai…… -
Java – the best design to decompose business logic and data layers when they appear to overlap?
I'm building an MVC web application (using the spring MVC framework), and I'm a little confused about the best way to …… -
Java – how do I combine two streams?
I'm trying to learn / understand the flow in Java and have this Code: List <Tag> tags = (classA.getTags() != nul…… -
Java – JIT – micro optimization – if statement elimination
We assume that we have the following code: public static void check() { if (Config.initialized) { ..…… -
Java – hibernate is much faster when executing native queries
The following query should return about 800 objects The problem is that hibernate actually executes 800 queries to get…… -
Why use Java. Net in Java security. Can securitymanager read any file?
I just want to read and write some files in my java program So I use Java security. Security manager to manage it, but…… -
Java – why does JIT compile some methods at startup?
I am studying JIT behavior on a very simple code block: public class PlayWithAssembly { public static void main(S…… -
The method filter (predict ) in Java – stream type is not applicable to parameters ((E) – > {})
How to set the value in Java 8 in the filter? I want to set emailid to null, where firstname is Raj How can I do this …… -
Java – call executorservice. Java from completable future shutdownNow
When one of the already running tasks throws an exception, I need to cancel all the scheduled but not yet running comp…… -
Java – error calling method check when deploying war on Tomcat
When I deploy the war generated by ant on the local system (copy / paste under / webapps), everything is normal The pr…… -
Java – add fields to webservice
I have a soap service that exposes methods TradeDetail getTradeDetail() Tradedetail stores five fields, transaction nu…… -
Java – the following code is thread safe
I have a scenario. I must maintain a map that can be filled by multiple threads. Each thread modifies the correspondin…… -
How will you implement a secure static login credential system in Java?
We recently conducted a security audit and exposed some weaknesses in the system here One of the resulting tasks is th…… -
Java – condition check C: if always fails
c: If the test always fails to me, it will never enter the loop I use the following namespace xmlns:fn="http://java.su…… -
Java – when to use global transactions or spring AOP for transactions
Q1. I know that when we need to deal with multiple databases, we need to use global transactions But from this article…… -
Ugly Java data structure
I created the following structure that maps unique double values to one or more pairs of integers: @SuppressWarnings("…… -
Java – equivalent to JFrame What is the AWT of setdefaultcloseoperation?
We use the setdefaultcloseoperation (JFrame. Exit_on_close) method of JFrame I want to support the native look and fee……