58
votes
17
answers
369
views
JavaScript hashmap equivalent
As made clear in update 3 on this answer, this notation: var hash = {}; hash[X] does not actually hash the ob
56
votes
26
answers
1.7K
views
How to detect a loop in a linked list?
Say you have a linked list structure in Java. It's made up of Nodes: class Node { Node next; //
50
votes
24
answers
691
views
How to implement a tree data-structure in Java?
Is there any standard Java library class to represent a tree in Java? Specifically I need to represent the fo
65
votes
5
answers
1.7K
views
59
votes
30
answers
1.5K
views
Simplest code for array intersection in javascript
What's the simplest, library-free code for implementing array intersections in javascript? I want to writ
53
votes
27
answers
1.2K
views
How do you implement a Stack and a Queue in JavaScript?
What is the best way to implement a Stack and a Queue in JavaScript? I'm looking to do the shunting-yard
55
votes
20
answers
415
views
Can I hide the HTML5 number input’s spin box?
Is there a consistent way across browsers to hide the new spin boxes that some browsers (such as Chrome) rende
55
votes
12
answers
771
views
Why don't self-closing script elements work?
What is the reason browsers do not correctly recognize: <script src="foobar.js" /> <!-- self-closing
51
votes
29
answers
2.2K
views
Retrieve the position (X,Y) of an HTML element relative to the browser window
I want to know how to get the X and Y position of HTML elements such as img and div in JavaScript relative to
55
votes
20
answers
1.5K
views
How do I modify the URL without reloading the page?
Is there a way I can modify the URL of the current page without reloading the page? I would like to access th
56
votes
23
answers
2K
views
Storing Objects in HTML5 localStorage
I'd like to store a JavaScript object in HTML5 localStorage, but my object is apparently being converted
60
votes
30
answers
517
views
How can I convert a stack trace to a string?
What is the easiest way to convert the result of Throwable.getStackTrace() to a string that depicts the stackt
53
votes
30
answers
1.9K
views
What does "Could not find or load main class" mean?
A common problem that new Java developers experience is that their programs fail to run with the error message
60
votes
30
answers
681
views
How do I create a Java string from the contents of a file?
I've been using the idiom below for some time now. And it seems to be the most wide-spread, at least on t
55
votes
30
answers
1.8K
views
How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
I am trying to use Notepad++ as my all-in-one tool edit, run, compile, etc. I have JRE installed, and I have
56
votes
30
answers
2K
views
Difference between StringBuilder and StringBuffer
What is the main difference between StringBuffer and StringBuilder? Is there any performance issues when decid
60
votes
30
answers
1.3K
views
Why use getters and setters/accessors?
What's the advantage of using getters and setters - that only get and set - instead of simply using publi
64
votes
30
answers
833
views
How can I avoid Java code in JSP files, using JSP 2?
I'm new to Java EE and I know that something like the following three lines <%= x+1 %> <%= reque
51
votes
30
answers
701
views
Sort a Map<Key, Value> by values
I am relatively new to Java, and often find that I need to sort a Map<Key, Value> on the values. Since
51
votes
30
answers
1.1K
views
How to split a string in Java
I have a string, "004-034556", that I want to split into two strings: string1="004"; string2="034556"; That
