包含标签：Java 的文章
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Using javax Tool for cascade memory compilation
Eclipse's JDT compiler provides an interface inameenvironment, which defines the method findtype (...), enabling you t…… -
Sparksql and explode on dataframe in Java
Is there a simple way to use array column explosion on sparksql dataframe? It's relatively simple in Scala, but this f…… -
Java – HashSet adds duplicate entries, although hashcode() and equals() are implemented
I have the following categories: class Point { double x,y; // .... constructor and other functions here …… -
Java – how to resolve conflicting attributes if multiple profiles are activated
Maven profiles documentation does not mention this, which may be a sign of wrong design in the construction process, b…… -
Java – convert a triangle to another triangle
Hi, I'm trying to create an affine transformation, let me turn one triangle into another I have the coordinates of two…… -
Java – why does TreeSet throw ClassCastException
In the following code, I try to add two employee objects Set<Employee> s = new TreeSet<Employee>(); s.add(…… -
Is the Java – VIM editor smart?
I program in C or Java So I want to use the VIM editor because it is very flexible I heard I can configure the VIM edi…… -
Java anonymous classes and synchronization and “this”
I'm dealing with a competitive condition that I believe in my java GUI I have some methods to create an "anonymous met…… -
Java: the difference between collections and “data structures”
In Java, I don't understand the relationship between sets and "data structures" In my opinion, set refers to list, set…… -
Java – Tomcat can’t find my servlet and throw an exception, but why?
I tried to get into Java Web development, but it seems to be running into a strange problem with Tomcat and a very sim…… -
@Elementcollection Java persistence (hibernate) causes duplicate instances to be loaded
When @ elementcollection is used, multiple instances of all objects being loaded are loaded More specifically, it is l…… -
Is there a quick way to convert Java XML objects to scala XML objects?
Scala has its own XML library and provides built - in support However, one of the main features of the language is cal…… -
Java – lists and lists
Why lose type security when using list and use list < Object >? Aren't they basically the same? Editor: I found …… -
JPA – @ onetoone unidirectional and bidirectional
I have two examples, the first is @ onetoone one-way mapping and the second two-way mapping In one-way mapping, the ow…… -
Java – JPS cannot connect to remote jstatd
I'm using jstatd to query a remote JVM using JPS so that I can eventually monitor it using visual VM I use jstatd to r…… -
Java – create a command console
I have an unusual question: how to use swing to create a "command console"? What I want is the console where the user …… -
Java – default timeout for httpcomponent client
I can't find any documents on the default httpparams of httpclient 4.1? What is the default socket timeout when I do a…… -
Java – type A has defined an error
I tried to search for a solution, but I found that I didn't know how to apply it in this case Please help me correct m…… -
Java – use add () in the fragmenttransaction addToBackStack(),add(). Detach() and replace() What’s the difference between addtobackstack()?
In the FragmentTransaction project on Android docs, the method replace () is described, which is the same as calling t…… -
Java – how do I map spring MVC controllers to URIs with and without trailing slashes?
I have a spring controller with several requestmappings with different URIs My servlet is "UI" The servlet's base URI …… -
Bring components on JPanel to the front end (Java)
In VB, you can use zorder Before you ask, no, I didn't use the layout manager in this case If you have two components …… -
Switch scenes in JavaFX
I have a problem closing the current scene and opening another scene when selecting MenuItem My main stage codes are a…… -
Java – when to use servicetracker and servicereference
I've just started using OSGi programming, and I've encountered two ways to listen to activated services The first meth…… -
Parallelism and plan view in Java 8 streams
Hey, I have a problem with parallelism when I use flatmap IntStream.of(-1,1).parallel().flatMap(i->IntStream.range(…… -
Java – why do you get a NullPointerException when comparing a string with null?
My code uses NullPointerException to break in the following line: if (stringVariable.equals(null)){ Before this statem…… -
java – com. w3c. dom. Document does not have
I'm using the following code to create com. Com from string w3c. dom. Document： DocumentBuilderFactory docFactory = D…… -
Java – LinkedHashMap signature
Looking at the JDK source code of LinkedHashMap, I notice that this class is declared as: public class LinkedHashMap&l…… -
Remote virtual machine using vagrant
I want to use vagrant to make the virtual machine run on a more powerful server than my laptop Can I use vagrant remot…… -
Java – Maven cannot find dependencies
I use Maven 3.1 Version 1 I'm trying to compile with dependency springs I see that this should exist in Maven through …… -
Java – get the metadata of the file
Can I know the metadata of a file through Java? If so, how to get the metadata of the file in Java? Solution You can g…… -
Java – “a value of type string cannot be opened below the source level..” error
I am using eclipse to develop a java program I had to downgrade JRE and JDK from 1.7x to 1.6 Now everything points to …… -
How does Java’s dynamic proxy actually work?
I know how to use dynamic proxies in Java, but what I don't understand is how VM actually creates dynamic proxies Does……