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Weird Integer boxing in Java
... section 5.1.7:
If the value p being boxed is true,
false, a byte, a char in the range
\u0000 to \u007f, or an int or short
number between -128 and 127, then let
r1 and r2 be the results of any two
boxing conversions of p. It is always
the case that r1 == r2.
The discussion goes on...
How to insert a newline in front of a pattern?
...adability - the only caveat is that you then need to double all literal \ chars.
– mklement0
Nov 30 '15 at 3:59
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Can't choose class as main class in IntelliJ
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Select the folder containing the package tree of these classes, right-click and choose "Mark Directory as -> Source Root"
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Swift - Split string over multiple lines
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This still works, but you need to manually add the \n character. For example, in the REPL: println("foo\n" + "bar") prints foo and bar on separate lines.
– Brian Gerstle
Jul 8 '15 at 17:41
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Insert all values of a table into another table in SQL
.... But the insert statement accepts values, but i would like it to accept a select * from the initial_Table. Is this possible?
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The simplest way to comma-delimit a list?
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The StringJoiner class.
Example:
// Util method for strings and other char sequences
List<String> strs = Arrays.asList("1", "2", "3");
String listStr1 = String.join(",", strs);
// For any type using streams and collectors
List<Object> objs = Arrays.asList(1, 2, 3);
String listStr2 ...
Count number of records returned by group by
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You can do both in one query using the OVER clause on another COUNT
select
count(*) RecordsPerGroup,
COUNT(*) OVER () AS TotalRecords
from temptable
group by column_1, column_2, column_3, column_4
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Combining C++ and C - how does #ifdef __cplusplus work?
...for functions with names like _Z1hic when you were looking for void h(int, char)
5: This sort of mixing is a common reason to use extern "C", and I don't see anything wrong with doing it this way -- just make sure you understand what you are doing.
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How to generate a random string in Ruby
I'm currently generating an 8-character pseudo-random uppercase string for "A" .. "Z":
50 Answers
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Changing one character in a string
What is the easiest way in Python to replace a character in a string?
11 Answers
11
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