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What is the difference between ArrayList.clear() and ArrayList.removeAll()?
...h faster since it doesn't have to deal with all those extra method calls.
And as Atrey points out, c.contains(..) increases the time complexity of removeAll to O(n2) as opposed to clear's O(n).
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Best way to make Java's modulus behave like it should with negative numbers?
... of the negative values of a, since (a % b) is a negative value between -b and 0, (a % b + b) is necessarily lower than b and positive. The last modulo is there in case a was positive to begin with, since if a is positive (a % b + b) would become larger than b. Therefore, (a % b + b) % b turns it in...
Database Design for Revisions?
...tribute. This just causes problems down the line, requires surrogate keys and all sorts of other problems.
Design 2 does have problems with schema changes. If you change the Employees table you have to change the EmployeeHistories table and all the related sprocs that go with it. Potentially doub...
Git Symlinks in Windows
...ome a problem for Windows developers. In windows (msysgit), the symlink is converted to a text file with a path to the file it points to. Instead, I'd like to convert the symlink into an actual Windows symlink.
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Type erasure techniques
... erasure techniques in C++ are done with function pointers (for behaviour) and void* (for data). The "different" methods simply differ in the way they add semantic sugar. Virtual functions, e.g., are just semantic sugar for
struct Class {
struct vtable {
void (*dtor)(Class*);
vo...
Why is the Windows cmd.exe limited to 80 characters wide?
...my terminal on unix. What is the history or reason behind windows lame command line?
14 Answers
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What does “@private” mean in Objective-C?
... // We can access protectedLetter because it's protected
// and it is declared by a superclass; @protected variables
// are available to subclasses.
protectedLetter = 'z';
// We can't access privateBool because it's private;
// only methods of the clas...
Android: AutoCompleteTextView show suggestions when no text entered
...ou can arrange to show it when you want. Or, subclass AutoCompleteTextView and override enoughToFilter(), returning true all of time.
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Best practice for instantiating a new Android Fragment
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If Android decides to recreate your Fragment later, it's going to call the no-argument constructor of your fragment. So overloading the constructor is not a solution.
With that being said, the way to pass stuff to your Fragment...
XPath: How to select elements based on their value?
...ult.
There are two important rule about string():
The string() function converts a node-set to a string by returning the string value of the first node in the node-set, which in some instances may yield unexpected results.
text() is relative path that return a node-set contains all the text node...