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Is it good practice to use java.lang.String.intern()?
...ppropriate strings on input so you don't have to worry about it anymore.
(from JGuru)
Third disadvantage (Java 7 or less only): interned Strings live in PermGen space, which is usually quite small; you may run into an OutOfMemoryError with plenty of free heap space.
(from Michael Borgwardt)
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Why doesn't RecyclerView have onItemClickListener()?
...iewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_layout, parent, false);
MyAdapter.ViewHolder vh = new ViewHolder(v, new MyAdapter.ViewHolder.IMyViewHolderClicks() {
public void onPotato(View caller) { Log.d(...
Python name mangling
...e, you will get annoyed by Python programmers telling you to remove the __ from your code when you ask a question in Stack Overflow :)
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Can you get DB username, pw, database name in Rails?
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From within rails you can create a configuration object and obtain the necessary information from it:
config = Rails.configuration.database_configuration
host = config[Rails.env]["host"]
database = config[Rails.env]["d...
Access parent DataContext from DataTemplate
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At first I thought that the x:Names of parent elements are not accessible from within a templated item, but since I found no better solution, I just tried, and it works fine.
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iPhone app in landscape mode, 2008 systems
Please note that this question is from 2008 and now is of only historic interest.
8 Answers
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Generate colors between red and green for a power meter?
...)
Another way to do would be to use a HSV colour model, and cycle the hue from 0 degrees (red) to 120 degrees (green) with whatever saturation and value suited you. This should give a more pleasing gradient.
Here's a demonstration of each technique - top gradient uses RGB, bottom uses HSV:
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Retrieve the position (X,Y) of an HTML element relative to the browser window
... If you need it relative to another element, simply subtract one rectangle from the other:
var bodyRect = document.body.getBoundingClientRect(),
elemRect = element.getBoundingClientRect(),
offset = elemRect.top - bodyRect.top;
alert('Element is ' + offset + ' vertical pixels from <bod...
Does Java casting introduce overhead? Why?
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There are 2 types of casting:
Implicit casting, when you cast from a type to a wider type, which is done automatically and there is no overhead:
String s = "Cast";
Object o = s; // implicit casting
Explicit casting, when you go from a wider type to a more narrow one. For this case, y...
What is the C++ function to raise a number to a power?
...s:
pow(float, float);
pow(float, int);
pow(double, double); // taken over from C
pow(double, int);
pow(long double, long double);
pow(long double, int);
Now you can't just do
pow(2, N)
with N being an int, because it doesn't know which of float, double, or long double version it should take, ...