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Why does String.valueOf(null) throw a NullPointerException?
...String.valueOf((Object) null));
// prints "null"
Related questions
How does polymorph ambiguity distinction work?
Which overload will get selected for null in Java?
Moral of the story
There are several important ones:
Effective Java 2nd Edition, Item 41: Use overloading judiciously
Just...
Is Integer Immutable
...
Immutable does not mean that a can never equal another value. For example, String is immutable too, but I can still do this:
String str = "hello";
// str equals "hello"
str = str + "world";
// now str equals "helloworld"
str was not...
Where does git config --global get written to?
...le setter line, I'm not seeing HOME defined in the etc\profile script. It does still seem to act as described, but I'm unclear where HOME is being set nowadays.
– ojchase
Oct 5 '18 at 17:48
...
Is there a Java reflection utility to do a deep comparison of two objects?
... this function and it seems to do a deep comparison where as EqualsBuilder does not.
– Howard May
Mar 9 '12 at 15:19
I...
Why does one hot encoding improve machine learning performance?
...curacy, compared to using the original matrix itself as training data. How does this performance increase happen?
3 Answer...
Is there a Null OutputStream in Java?
...m for an API I'm using, but I don't actually have a need for the output. Does Java have an OutputStream equivalent to > /dev/null ?
...
Pycharm does not show plot
Pycharm does not show plot from the following code:
25 Answers
25
...
How does interfaces with construct signatures work?
...-able function. Here's an example involving interfaces new signatures that does work:
interface ComesFromString {
name: string;
}
interface StringConstructable {
new(n: string): ComesFromString;
}
class MadeFromString implements ComesFromString {
constructor (public name: string) {
...
What does numpy.random.seed(0) do?
What does np.random.seed do in the below code from a Scikit-Learn tutorial? I'm not very familiar with NumPy's random state generator stuff, so I'd really appreciate a layman's terms explanation of this.
...
How to read a large file - line by line?
...ry for loop iterates through the f file object line by line. internally it does buffered IO (to optimized on costly IO operations) and memory management.
with open("x.txt") as f:
for line in f:
do something with data
2. use of yield
Sometimes one might want more fine-grained control ove...