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Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
...s a sizable difference - one is considered an object, which means you can call methods and interact with it in abstract data structures, like List. The other is a primitive, which is just a raw value.
– Makoto
Jan 2 '14 at 6:07
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Find which version of package is installed with pip
..., is it possible to figure out which version of a package is currently installed?
15 Answers
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What is the difference between :first-child and :first-of-type?
...first child of the parent. So far the child elements we're looking at have all been divs, but bear with me, I'll get to that in a bit.
For now, the converse also holds true: any :first-child is also :first-of-type by necessity. Since the first child here is also the first div, it will match both ps...
Extending an Object in Javascript
... I have one question: how is the Person() constructor being called when you do new Robot()? It seems to me that you should call that base class constructor instead of doing this.name = name; in the Robot() constructor...
– Alexis Wilke
Apr 7 '14 a...
'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?
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and tests whether both expressions are logically True while & (when used with True/False values) tests if both are True.
In Python, empty built-in objects are typically treated as logically False while non-empty built-ins are logically True. This facilitates the c...
Choice between vector::resize() and vector::reserve()
I am pre-allocating some memory to my a vector member variable. Below code is minimal part
4 Answers
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RRSet of type CNAME with DNS name foo.com. is not permitted at apex in zone bar.com
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As per RFC1912 section 2.4:
A CNAME record is not allowed to coexist with any other data. In
other words, if suzy.podunk.xx is an alias for sue.podunk.xx, you
can't also have an MX record for suzy.podunk.edu, or an A record, or
even a TXT record. Especially do not try t...
What does the question mark in Java generics' type parameter mean?
This is a small snippet of code taken from some of the examples that accompany the Stanford Parser. I've been developing in Java for about 4 years, but have never had a very strong understanding of what this style of code is supposed to indicate.
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how do I initialize a float to its max/min value?
...t;algorithm>) which may be a better choice for finding the largest or smallest value in an array.
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Java enum - why use toString instead of name
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It really depends on what you want to do with the returned value:
If you need to get the exact name used to declare the enum constant, you should use name() as toString may have been overriden
If you want to print the enum const...