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What is the concept of erasure in generics in Java?
...ain just talks in terms of java.lang.Object - the compiler generates extra casts where necessary. At execution time, a List<String> and a List<Date> are exactly the same; the extra type information has been erased by the compiler.
Compare this with, say, C#, where the information is re...
SQL query to group by day
... Sales
GROUP BY
saledate
If you're using MS SQL 2008:
SELECT
CAST(created AS date) AS saledate,
SUM(amount)
FROM
Sales
GROUP BY
CAST(created AS date)
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Why does Decimal.Divide(int, int) work, but not (int / int)?
...mals.
You can enforce non-integer division on int arguments by explicitly casting at least one of the arguments to a floating-point type, e.g.:
int a = 42;
int b = 23;
double result = (double)a / b;
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Converting from IEnumerable to List [duplicate]
...ections.IEnumerable instead of IEnumerable<T> you can use enumerable.Cast<object>().ToList()
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What is the use of the ArraySegment class?
...ugh they inexplicably made GetEnumerator private, meaning you're forced to cast to IEnumerable<T> (a boxing conversion) to call it. Ugh!
– BlueRaja - Danny Pflughoeft
Nov 1 '17 at 12:59
...
How to pass anonymous types as parameters?
...
If casting with "as" you should check if list is null
– Alex
Jul 8 '11 at 13:11
...
Get Bitmap attached to ImageView
... Be carefull to check if your image.getDrawable() can actually be cast to BitmapDrawable (to avoid IllegalCastExceptions). If, for instance, you use layers in your image then this snippet will be slightly different: Bitmap bitmap = ((BitmapDrawable)((LayerDrawable)image.getDrawable()).getDr...
Select values from XML field in SQL Server 2008
...
INSERT INTO dbo.DeleteBatch ( ExecutionKey, SourceKeys )
SELECT 1,
(CAST('<k>1</k><k>2</k><k>3</k>' AS XML))
INSERT INTO dbo.DeleteBatch ( ExecutionKey, SourceKeys )
SELECT 2,
(CAST('<k>100</k><k>101</k>' AS XML))
Here's my S...
Correct use of Multimapping in Dapper
...
I just ran a test that works fine:
var sql = "select cast(1 as decimal) ProductId, 'a' ProductName, 'x' AccountOpened, cast(1 as decimal) CustomerId, 'name' CustomerName";
var item = connection.Query<ProductItem, Customer, ProductItem>(sql,
(p, c) => { p.Customer ...
Why is “int i = 2147483647 + 1;” OK, but “byte b = 127 + 1;” is not compilable?
...t has to do with Java not supporting coercions (*). You have to add a typecast
byte b = (byte)(127 + 1);
and then it compiles.
(*) at least not of the kind String-to-integer, float-to-Time, ... Java does support coercions if they are, in a sense, non-loss (Java calls this "widening").
And no,...