Java
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Is java heap memory continuous?
I've seen people comment that Java heap memory is continuous, and people say the opposite So, can someone give me a fi…… -
Java: how to cancel application exit
In one of my programs, I want to display a dialog when the user tries to exit the application The user must then choos…… -
Reinsert Na into vector
I have a value vector containing Na These values need to be processed by an external program that cannot process Na, s…… -
Java – why can’t I access my panel’s getWidth () and getHeight () functions?
I'm writing a simple program to test the basic GUI The program prints a letter in the middle of the screen, allowing t…… -
Bit level operations in Java
I'm trying to do something in Java to apply masks, representation sets, etc int one=1; int two=2; int andop=1&2; S…… -
Java – mongodb upsert exception invalid bson field
This exception: Exception in thread "Thread-1" java.lang.IllegalArgumentException: Invalid BSON field name id at o…… -
Multithreading – how do I make Perl threads without copying all variables?
I have a Perl program that would be very useful to use some form of parallelism But I have a lot of data in variables,…… -
Java – references files through classpath in the context of spring
I'm trying to set up org springframework. beans. factory. config. Propertyplaceholderconfigurer spring bean. I have JD…… -
Java – gradle compiles but does not run TestNG tests
We just started using gradle and TestNG in our project, so I'm checking if there are actually no test failures I was s…… -
Java – xssfcellstyle setfillforeroundcolor and setfillbackgroundcolor do not work
I try to use setfillforeroundcolor and setfillbackgroundcolor to change the cell color of Excel file But I failed. I r…… -
How to use long data types in Java?
See the English answer > the literal XYZ of type int is out of range It seems that I don't know how to use long dat…… -
Write the GUI programmatically, or use the advanced GUI editor (Java Swing)?
I intend to write a swing based application (using NetBeans 6.8) It seems that NetBeans has a very advanced GUI editor…… -
Java – vector vs ArrayList performance test
Everyone said that vectors should be used because of performance (causing vectors to synchronize after each operation …… -
Java – a better way to create AES keys than secure random
I need to send encrypted data from the Java client to the c# server Now I'm learning how to encrypt data using AES Acc…… -
Determine whether the document is doc or docx in a Java application without knowing its extension
There is a constraint in the content management system that requires all word documents with a specific extension to b…… -
Java converts GIF images to PNG format
I have to build a java servlet to receive images and return images converted to PNG format How can I do this? Thank yo…… -
Java – how to send a post request and get a file response?
I want to send post requests (such as HTML forms) and get files (HTTP Title: "content disposition: attachment; filenam…… -
Java – when the enumeration type reference is class How do I convert a string to an enumerated value?
I have code to set values on objects using the setter method One of the setters takes enum type as a method parameter …… -
Error message: “when debugging PHP with Xdebug and eclipse, the script is terminated unexpectedly, and debugging is over”
I encountered the following errors while debugging: PHP. Ini settings: xdebug.remote_enable=true xdebug.remote_host=l…… -
Java – double check locking using regular HashMap
Back to concurrency So far, it's clear that for double check locking, variables need to be declared volatile However, …… -
Java – how to prevent hibernate from refreshing in the list?
I have a simple hibernate query, such as: from MyEntity where name = ? It's not fancy, but it's called many times in a…… -
Java swing – JList custom cell rendering – capture operation
Whenever I create a custom cell renderer for JList, any elements I add to it will not respond to the operation For exa…… -
Java – regular expression patterns match all uppercase letters after colons
I need a pattern that matches words like apple: or pear: [A-Z] [:] will match R: but not the whole word, so it will gi…… -
Java gets the file extension without substring
How to get a file extension in Java without using stupid lastIndexOf ('.') and so on? Solution The Apache commons libr…… -
Java – accessing application properties in spring MVC
New features of spring MVC I think so Two properties are stored in the properties file (uploadfolder =.., downloadfold…… -
Java: what is the difference between format specifiers% X and% H?
Looking at the specification page, I see that% h calls integer Tohexstring(), but I can't find any actual difference b…… -
Java – when I need to escape an HTML string?
In my legacy project, I can see that escape html is used before sending strings to the browser StringEscapeUtils.escap…… -
Java – Jackson, serializing a referenced attribute
When serializing Java objects with other object references, I only need to serialize one attribute of the nested objec…… -
Java – get button name from actionlistener?
I have browsed the Internet, but I can't find the answer I am using the for loop to create 36 buttons called A1, A2, e…… -
Java – lwjgl cannot find the display class
I have installed lwjgl into the Java project. I can't import the display class import org.lwjgl.opengl.display; An uns…… -
Java – swing text editor, color and highlight
I am writing an application that users need to write a JavaScript script as input. Now I have a simple jtextarea, but …… -
Java – how to delete objects from the stream in the foreach method?
I have to use arrays: arra and ARRB Arra and ARRB are lists of different types of objects. The add function converts o……