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Get the cartesian product of a series of lists?
How can I get the Cartesian product (every possible combination of values) from a group of lists?
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Are duplicate keys allowed in the definition of binary search trees?
I'm trying to find the definition of a binary search tree and I keep finding different definitions everywhere.
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Check if a Class Object is subclass of another Class Object in Java
I'm playing around with Java's reflection API and trying to handle some fields. Now I'm stuck with identifying the type of my fields. Strings are easy, just do myField.getType().equals(String.class) . The same applies for other non-derived classes. But how do I check derived classes? E.g. LinkedLi...
Why does appending “” to a String save memory?
I used a variable with a lot of data in it, say String data .
I wanted to use a small part of this string in the following way:
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Grabbing the href attribute of an A element
Trying to find the links on a page.
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What are the differences between B trees and B+ trees?
In a b-tree you can store both keys and data in the internal and leaf nodes , but in a b+ tree you have to store the data in the leaf nodes only .
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How to modify list entries during for loop?
Now I know that it is not safe to modify the list during an iterative looping. However, suppose I have a list of strings, and I want to strip the strings themselves. Does replacement of mutable values count as modification?
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What's better at freeing memory with PHP: unset() or $var = null
I realise the second one avoids the overhead of a function call ( update , is actually a language construct), but it would be interesting to know if one is better than the other. I have been using unset() for most of my coding, but I've recently looked through a few respectable classes found off t...
When do you use POST and when do you use GET?
From what I can gather, there are three categories:
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What's this =! operator? [duplicate]
I was surprised by this code:
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