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Convert Long into Integer
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Why would you cast twice when you can just call intValue instead ? Plus it is going to unbox to long, cast to int, and rebox to Integer, which does not seem very useful. I don't see the point on top of my head, do you have a good reason fo...
Java's L number (long) specification
...umed to be a double.
In all other cases (byte, short, char), you need the cast as there is no specific suffix.
The Java spec allows both upper and lower case suffixes, but the upper case version for longs is preferred, as the upper case L is less easy to confuse with a numeral 1 than the lower cas...
Best way to check for “empty or null value”
... '
Demo
Empty string equals any string of spaces when cast to char(n):
SELECT ''::char(5) = ''::char(5) AS eq1
, ''::char(5) = ' '::char(5) AS eq2
, ''::char(5) = ' '::char(5) AS eq3;
Result:
eq1 | eq2 | eq3
----+-----+----
t | t | t
Test for "null or empty string" w...
How to serialize a lambda?
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Java 8 introduces the possibility to cast an object to an intersection of types by adding multiple bounds. In the case of serialization, it is therefore possible to write:
Runnable r = (Runnable & Serializable)() -> System.out.println("Serializable!");
...
How to negate a method reference predicate
... method reference. See @vlasec's answer below that shows how by explicitly casting the method reference to a Predicate and then converting it using the negate function. That is one way among a few other not too troublesome ways to do it.
The opposite of this:
Stream<String> s = ...;
int empt...
PostgreSQL query to return results as a comma separated list
Let say you have a SELECT id from table query (the real case is a complex query) that does return you several results.
5 ...
How do I convert a decimal to an int in C#?
...an also use Decimal.ToInt32. Again, see MSDN. Finally, you can do a direct cast as in
decimal value = 3.14m;
int n = (int) value;
which uses the explicit cast operator. See MSDN.
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What does “dereferencing” a pointer mean?
...he pointer may be relative to some specific memory area, which the CPU may select based on CPU "segment" registers or some manner of segment id encoded in the bit-pattern, and/or looking in different places depending on the machine code instructions using the address.
For example, an int* properly ...
Why does (0 < 5 < 3) return true?
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My guess is because 0 < 5 is true, and true < 3 gets cast to 1 < 3 which is true.
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Find index of a value in an array
... return -1;
}
And you can use LINQ as well:
int keyIndex = words
.Select((v, i) => new {Word = v, Index = i})
.FirstOrDefault(x => x.Word.IsKey)?.Index ?? -1;
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