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Difference between HashSet and HashMap?
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@justk: yes, you can get two keys in one bucket, and then equals() is used to distinguish between them. That's why it's essential that hashCode() and equals() are compatible.
– Michael Borgwardt
May 5 '10 at 14:14
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Maintain the aspect ratio of a div with CSS
...revent its content from stretching it, you need to add an absolutely positioned child and stretch it to the edges of the wrapper with:
div.stretchy-wrapper {
position: relative;
}
div.stretchy-wrapper > div {
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
}
Here's a demo and an...
Error: Can't set headers after they are sent to the client
...with the current npm install connect, which looks quite different from the one github as of this post). When the server gets a request, it iterates over the stack, calling the (request, response, next) method.
The problem is, if in one of the middleware items writes to the response body or headers...
Where does the @Transactional annotation belong?
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I think transactions belong on the Service layer. It's the one that knows about units of work and use cases. It's the right answer if you have several DAOs injected into a Service that need to work together in a single transaction.
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How to correctly use the extern keyword in C
...e the variable itself, i.e. doesn't allocate any memory. This needs to be done somewhere else. Thus it's important if you want to import the variable from somewhere else. For functions, this only tells the compiler that linkage is extern. As this is the default (you use the keyword "static" to indic...
Error to use a section registered as allowDefinition='MachineToApplication' beyond application level
... in my /portal/ directory has this error message, and I know it's a common one. I have googled this error message to no end, and I see a lot of posts telling me to configure the /portal/ folder as an application in IIS (which I have), and more posts telling me I have nested web.configs (but none of...
JS: iterating over result of getElementsByClassName using Array.forEach
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You linked the wrong benchmark. Here is the correct one measurethat.net/Benchmarks/Show/4076/0/… Just ran it on my low-end phone, got 160k/s vs 380k/s. Since you mentioned DOM manipulation, here is that too measurethat.net/Benchmarks/Show/5705/0/… Got 50k/s vs 130k/s. As y...
How do I undo 'git add' before commit?
...changes. This can come in handy when there are too many files to be listed one by one in a reasonable amount of time.
In old versions of Git, the above commands are equivalent to git reset HEAD <file> and git reset HEAD respectively, and will fail if HEAD is undefined (because you haven't yet ...
Waiting on a list of Future
... CompletionService to receive the futures as soon as they are ready and if one of them throws an exception cancel the processing. Something like this:
Executor executor = Executors.newFixedThreadPool(4);
CompletionService<SomeResult> completionService =
new ExecutorCompletionService&l...
How to modify a specified commit?
...command, because you need actually to rebase back to the commit before the one you wish to modify.
In the default editor, modify pick to edit in the line mentioning 'bbc643cd'.
Save the file and exit: git will interpret and automatically execute the commands in the file. You will find yourself in ...