Recent Posts
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Java – why use heaps instead of binary trees when implementing priority queues?
In my opinion, the only advantage of heap over binary tree is to find the smallest item in heap with O (1) rather than…… -
Java – Jersey 2.2: containerresponsefilter and containerrequestfilter will never be executed
After the getting started guide on the Jersey website: I executed the following build commands: $mvn archetype:generat…… -
If the string in LISP is a vector, why can’t I use svref to access the first element?
So, I'm trying to learn lisp. I have a problem defining what a string is I'm reading Paul Graham's ANSI Common Lisp. I…… -
Java – uses the simulated location without setting it in the settings
I'm writing an application that takes advantage of the location simulation possibilities in Android What I want to ach…… -
How do I run the 32-bit API on a 64 bit computer?
I'm writing a Java application that must communicate with it. It must communicate with XBee radio through USB cable To…… -
Final variables and synchronization blocks in Java
What is the final variable in Java? For example, if I write the final int temp; What is the meaning of the final keywo…… -
Java – does spring provide securitycontext for threads executing hystrix commands
I'm running a spring boot application and just started integrating hystrix from spring cloud Netflix I'm using @ hystr…… -
Java – is it better for libgdx to use spritesheet or a single image?
I'm new to libgdx. I made 40 frames for the "hero run" wizard. I don't know if it's better to use spritesheet or a sin…… -
In Java, is there a more elegant way to remove duplicate strings from the ArrayList of strings?
So, in short, I have a Java job assignment that needs to manipulate the long ArrayList of strings in various ways (wha…… -
Javafx-2 – internal framework in JavaFX
I found this example of an internal framework http://docs.oracle.com/javase/tutorial/uiswing/components/internalframe.…… -
In Java, should resources be placed in the package / source hierarchy?
Suppose I develop a game and put it into the package structure: com.dxmio.games.breakout So where is the "best practic…… -
Java – how to add ArrayList in JSP
<html> <html> <head> <Meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1…… -
Java – play framework routing does not work
I just want to follow the zentasks tutorial of the play framework（ http://www.playframework.com/documentation/2.1.0/J…… -
Java – the easiest way to read Excel files in groovy?
Are there any warappers / utils that can be used to read Excel files in groovy I'm looking for something similar to gr…… -
Java – what is the best way to listen for changes in JTable cell values and update the database accordingly?
I am using multiple JTable builds and applications, and I need to detect when cell values change so that I can update …… -
Java – possible cause of “StreamCorruptedException: invalid stream header”
I use drools to handle my pricing rules However, when I try to execute the rule, the following exception is thrown: ja…… -
How to use comparable to compare common nodes in a linked list?
I'm using link lists to implement sort lists My node class looks like this public class Node<E>{ E elem; …… -
Project Euler #1 in Java
I encountered a problem with this code I don't want to see others, so I want to know what my fault is If we list all n…… -
What can be in the parentheses of a Java for loop?
My question is about Java for statements, such as for (int i = 0; i < 10; ++i) {/* stuff */} What I don't understan…… -
Java – guava set: limit the size of the permutation
Use guava 12 collections2 Permutations(), I wonder if I can limit the size of the permutation? More precisely, I want …… -
Java – why doesn’t 0.0F / 0.0F produce any runtime errors?
Recently I tested the following program & I expect runtime errors, but it displays "Nan" as output Why & how? …… -
What is the equivalent of unsigned long in Java
I wrote the following three functions for my project: WORD shuffling(WORD x) { // WORD - 4 bytes - 32 bits //given i…… -
Java — the problem of adjusting canvas in JScrollPane in jsplitpane
I am using NetBeans GUI editor to create an application. I want to have a jsplitpane in it. The top component will be …… -
JSF – P: autocomplete itemlabel throws “class’ Java. Lang. string ‘has no attribute’ label ‘.”
I'm changing from icefaces to primefaces (I really want to change RichFaces, but I won't cause errors in the new versi…… -
java. Lang.illegalstateexception: the response submitted in the servlet cannot be forwarded
See English answer > java Lang. IllegalStateException: cannot (forward | sendredirect | create session) after respo…… -
Java – how do you decide when to upgrade libraries in your project?
I work on a project that uses multiple open source Java libraries When upgrading to these libraries, we tend to follow…… -
Java – gets the height of the textview
I have some text to put in textview I did it with settext() Now I need to find the number of lines or height of text i…… -
Java prints an array of objects
I know there are many web pages about this problem, but I can't understand it in my case I need to print an array of o…… -
Java – access Tomcat context path from Servlet
In my servlet, I want to access the root of the context so that I can do some JavaScript scaling Minify can be done as…… -
Java – what does it mean for deprecated methods and how to resolve the resulting errors?
Why do I have a deprecation error on the line containing setwallpaper (BMP), and how to solve it? switch(v.getId()){ …… -
What is the difference between the gethost and getauthority methods in the URL class in Java?
I have a series of different forms of strings (URLs): > http：// domain name. anything / anypath > https：// dma……