Recent Posts
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Java – simple if statement and normal if statement
At the Java bytecode level, is there any difference between a simple if statement (example 1) and a normal if statemen…… -
Because Java io. NotSerializableException：org. apache. spark. Sparkcontext, spark job failed
When I try to apply method (computedwt) on RDD [(int, arraybuffer [(int, double)])] input, I face an exception input:s…… -
Download files of unknown length over HTTP using java
I want to download HTTP query in Java, but the length of the file I downloaded is uncertain I think this is very stand…… -
Syntax highlighter for Java
As you know, there is a PHP syntax highlighter named Geshi, which supports a large number of programming languages or …… -
Java 8 – filter lists in map values
I am writing a method that uses the input map in the format of map < term, list < integer > > One of the t…… -
Java – common types and performance
I wonder if the use of generic types in an application will have any (significant) degraded performance impact on the …… -
Java – how to test e-mail logic using play framework
I found an extended mailer course and wanted to test it automatically Using a mock mail program, I can send mail to th…… -
Java – the scanner did not scan my input
I'm trying to read a line and then enter the if statement But it will terminate after the first input of red import ja…… -
How do I change the background color of jtabbedpane?
I know you can modify the LAF properties, but if you don't, how can you do it? I'm just asking, because setbackground …… -
Display graphics – free Java library
See English answers > drawing graphs on Java [closed] 6 Solution There is an open source version of JGraph -
2D array problem Java
If I have a 2D array arr [rows] [columns], how can I find the size of rows and columns respectively with arr.length? S…… -
Java – what is the difference between jaxp, JDOM, Dom4j and Xerces?
What's the difference between them? It is said that jaxp is just an API specification, which is implemented by JDOM an…… -
Java – is there any way to extract the primary key (or ROWID) using namedparameterjdbctemplate and generatedkeyholder?
I tried to extract ROWID or primary key using spring's namedparameterjdbctemplate and generatedkeyholder I want to do …… -
Used to represent a number as string, integer All possible characters of Java
In integer In Java, there are the following codes: /** * All possible chars for representing a number as a String */…… -
Java – how to use reflection to tell a method to have a varargs parameter?
This is a sample code package org.example; import java.lang.reflect.Method; class TestRef { public void tes…… -
Java – sum of elements in the array
I'm doing a simple task for a summer java course. I just hope you can look at my code and see if the way I do it is th…… -
Java 8: intstream to integer []
I'm writing a simple program that will eventually plot the runtime of various sorting algorithms written in Java The g…… -
Java – loads drools / KIE workbench artifacts directly from the repository
We tried to switch to drools 6.0 using a new KIE workbench (formerly known as guvnor) and a new Maven based artifact N…… -
Java – play! Frame Create a new view
I created a new project using the playback console main.scala.html index.scala.html I want to add a new view file I…… -
Java – access spring beans * through dependency injection instead of*
We have some domain objects created at runtime – not spring These domain objects need access to some service type bean…… -
How to perform validation in JSF and how to create a custom validator in JSF
I want to perform validation in some of my input components, such as < H: inputtext > using some java bean metho…… -
Does adding a method to a Java class increase the memory usage of its instance?
Adding a member variable to a class will certainly increase the memory usage of its instance on the heap, but what abo…… -
java – Quartz StatefulJob / non-StatefulJob
Can you explain to me the exact average value of statefuljob in quartz, which is different from that without statefulj…… -
Using private methods from another class in Java
I have two classes: public class Class1{} public class Class2{ private void simpleMethod(){ /*...*/ } } In class2,…… -
Java – should a class implement an interface with only constants?
Today, I looked at the zipentry class and found the following: public class ZipEntry implements ZipConstants,Cloneable…… -
Java – how to print SOAP message content when using Apache axis
I am using Apache axis for web service automation I am preparing the soap request through axis and further accessing t…… -
Java – why doesn’t my operation work when I use BigDecimal?
I'm trying to operate with BigDecimal, but it always returns 0 Why does double work when I use it? public static void …… -
Java – the transient final field used as a lock is null
The following code throws a NullPointerException import java.io.*; public class NullFinalTest { public static voi…… -
Java – NetBeans cannot install some modules
I am using NetBeans 7.4 development version 2, all software packages First, I used NetBeans 7.2, all packages Then I w…… -
Java – multipartentitybuilder sends pictures to the railway server
I'm trying to send multiparty builder to my rails server However, when I try to build it, it crashes and gives me erro…… -
Java – error starting Tomcat in remote debugging mode
Tomcat is not started in debug mode Record the following log C:\ApacheSoft\apache-tomcat-7.0.67\bin>catalina.bat jp…… -
Please recommend using the Java framework to easily implement crud
I know ror can easily complete crud, but is there a similar framework in Java to make crud simple instead of entering ……