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What are the differences between a HashMap and a Hashtable in Java?
...shMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap's subclasses is LinkedHashMap, so in the event that you'd wa...
Android custom dropdown/popup menu
...To create a popup menu in android with Java:
Create a layout file activity_main.xml under res/layout directory which contains only one button.
Filename: activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/to...
What is move semantics?
...regarding C++0x . Most of the new features made sense to me, and I am actually excited about C++0x now, with the exception of one. I still don't get move semantics ... What is it exactly?
...
Why should I avoid using Properties in C#?
...erties, and recommends not to use them. He gave some reason, but I don't really understand. Can anyone explain to me why I should or should not use properties?
In C# 3.0, with automatic properties, does this change?
...
How does the vim “write with sudo” trick work?
Many of you have probably seen the command that allows you to write on a file that needs root permission, even when you forgot to open vim with sudo:
...
How do you set the Content-Type header for an HttpClient request?
...
?? typeof(System.Net.Http.Headers.HttpRequestHeaders)
.GetField("s_invalidHeaders", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
if (field != null)
{
var invalidFields = (HashSet<string>)field.GetValue(null);
invalidFields.Remove("Content-Type...
How do I force files to open in the browser instead of downloading (PDF)?
... that gives the file path, that we open in new tab using:window.open(url, '_blank').focus();
– Kailas
Dec 17 '14 at 12:21
3
...
Check if application is on its first run [duplicate]
... here
prefs = getSharedPreferences("com.mycompany.myAppName", MODE_PRIVATE);
}
@Override
protected void onResume() {
super.onResume();
if (prefs.getBoolean("firstrun", true)) {
// Do first run stuff here then set 'firstrun' as false
// u...
How to set data attributes in HTML elements
...nd 'handle', and also reserves any data name starting with an underscore ('_') for internal use.
It should be noted that jQuery's data() doesn't change the data attribute in HTML.
So, if you need to change the data attribute in HTML, you should use .attr() instead.
HTML
<div id="outer">
...
Add table row in jQuery
...ows, there will be no tbody unless you have specified one yourself.
DaRKoN_ suggests appending to the tbody rather than adding content after the last tr. This gets around the issue of having no rows, but still isn't bulletproof as you could theoretically have multiple tbody elements and the row wou...