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How do you make a deep copy of an object?
...copy constructor. Obvious but might be overlooked.
Example:
public class Order {
private long number;
public Order() {
}
/**
* Copy constructor
*/
public Order(Order source) {
number = source.number;
}
}
public class Customer {
private String nam...
Why return NotImplemented instead of raising NotImplementedError
...otImplemented, interpreter runs the Reflection Function but on the flipped order of input arguments.
You can find detailed examples here
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T-SQL: Deleting all duplicate rows but keeping one [duplicate]
...e AS (
SELECT[foo], [bar],
row_number() OVER(PARTITION BY foo, bar ORDER BY baz) AS [rn]
FROM TABLE
)
DELETE cte WHERE [rn] > 1
Play around with it and see what you get.
(Edit: In an attempt to be helpful, someone edited the ORDER BY clause within the CTE. To be clear, you can order ...
How are the points in CSS specificity calculated
...n CSS:
Specificities are compared by comparing the three components in order: the specificity with a larger A value is more specific; if the two A values are tied, then the specificity with a larger B value is more specific; if the two B values are also tied, then the specificity with a larger c...
What is the difference between and ?
...x. And the CSS for the above code is
.item {
position: relative;
border: 1px solid green;
height: 30px;
}
.item .name {
position: absolute;
top: 0px;
left: 0px;
}
.item .price {
position: absolute;
right: 0px;
bottom: 0px;
}
So div tag can contain other eleme...
What is the difference between user variables and system variables?
...nment variables are 'evaluated' (ie. they are attributed) in the
following order:
System variables
Variables defined in autoexec.bat
User variables
Every process has an environment block that contains a set of environment variables and their values. There are two types of environment variables: ...
What are bitwise operators?
... to the right until it's at the bottom, then mask off the remaining higher-order bits:
Int Alpha = Color >> 24
Int Red = Color >> 16 & 0xFF
Int Green = Color >> 8 & 0xFF
Int Blue = Color & 0xFF
0xFF is the same as 11111111. So essentially, for Red, you would be doin...
Should I be concerned about excess, non-running, Docker containers?
...mance or memory/storage penalties these non-running containers incur.
In order to assess how much storage non-running Docker containers are using, you may run:
docker ps --size --filter "status=exited"
--size: display total file sizes (FYI: Explain the SIZE column in "docker ps -s" and what "v...
How should one use std::optional?
...lacement new and a lot more other things with proper alignment and size in order to make it a literal type (i.e. use with constexpr) among other things. The naive T and bool approach would fail pretty quickly.
– Rapptz
Mar 13 '14 at 22:05
...
What does Serializable mean?
...en the answer, but I would like to add an example for those who need it in order to explain the idea:
Let's say you have a class person like the following:
public class Person implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
public ...