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What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
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For your needs, use ConcurrentHashMap. It allows concurrent modification of the Map from several threads without the need to block them. Collections.synchronizedMap(map) creates a blocking Map which will degrade performance, a...
How to get JSON objects value if its name contains dots?
...ase"][0].time;
In JavaScript, any field you can access using the . operator, you can access using [] with a string version of the field name.
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How to create an HTML button that acts like a link?
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HTML
The plain HTML way is to put it in a <form> wherein you specify the desired target URL in the action attribute.
<form action="https://google.com">
<input type="submit" value="Go to Google" />
</form>
If necessary, set CSS display: inlin...
Difference between and text
...type="submit">(html content)</button>
IE6 will submit all text for this button between the tags, other browsers will only submit the value. Using <button> gives you more layout freedom over the design of the button. In all its intents and purposes, it seemed excellent at first, but ...
How to align content of a div to the bottom
...down menus appearing below the content. It's just not pretty.
Honestly, for vertical centering issues and, well, any vertical alignment issues with the items aren't fixed height, it's easier just to use tables.
Example: Can you do this HTML layout without using tables?
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Do I need to store the salt with bcrypt?
bCrypt's javadoc has this code for how to encrypt a password:
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Why can't I use a list as a dict key in python?
I'm a bit confused about what can/can't be used as a key for a python dict.
11 Answers
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How to customize a Spinner in Android
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Create a custom adapter with a custom layout for your spinner.
Spinner spinner = (Spinner) findViewById(R.id.pioedittxt5);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.travelreasons, R.layout.simple_spinner_item);
adap...
Does a dot have to be escaped in a character class (square brackets) of a regular expression?
A dot . in a regular expression matches any single character. In order for regex to match a dot, the dot has to be escaped: \.
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How do I test if a string is empty in Objective-C?
...his will result in a false negative (saying the string isn't empty, when, for practical purposes, it is). Consider @"\u200B" (consisting only of Unicode character ZERO WIDTH SPACE. Printing it out will print 0 characters (verify using monospaced font), but string.length will give 1. There are other ...