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Java 8 Distinct by property
...ey(Person::getName))
Note that if the stream is ordered and is run in parallel, this will preserve an arbitrary element from among the duplicates, instead of the first one, as distinct() does.
(This is essentially the same as my answer to this question: Java Lambda Stream Distinct() on arbitrary ...
What is the difference between inversedBy and mappedBy?
... @PeterWooster, best practice is to use Annotations, as you have all info about the entity in one place then!
– Andreas Linden
Jan 22 '13 at 9:57
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Difference between SPI and API?
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The API is the description of classes/interfaces/methods/... that you call and use to achieve a goal, and
the SPI is the description of classes/interfaces/methods/... that you extend and implement to achieve a goal.
Put differently, the API tells you what a specific class/method does for you, ...
How does #include work in C++? [duplicate]
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It is basically a header file that also includes every standard library and STL include file. The only purpose I can see for it would be for testing and education.
Se e.g. GCC 4.8.0 /bits/stdc++.h source.
Using it would include a lot ...
SQL is null and = null [duplicate]
... 1), (1, 1);
select 'x = null' as test , x, y from t where x = null
union all
select 'x != null', x, y from t where x != null
union all
select 'not (x = null)', x, y from t where not (x = null)
union all
select 'x = y', x, y from t where x = y
union all
select 'not (x = y)', x, y from t where not (...
Python: Check if one dictionary is a subset of another larger dictionary
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Convert to item pairs and check for containment.
all(item in superset.items() for item in subset.items())
Optimization is left as an exercise for the reader.
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What exactly is a Context in Java? [duplicate]
...'s ApplicationContext, Android's Context, JNDI's InitialContext, etc. They all often follow the Facade Pattern which abstracts the environmental details the enduser doesn't need to know about away in a single interface/class.
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Uses for Optional
...tween wanting to use it everywhere something may be null , and nowhere at all.
14 Answers
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Running script upon login mac [closed]
...sking passwords, running other automator workflows at login time, conditionally run applications at login time and so on...
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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...r various reasons. During compilation of your project, each .cpp file (usually) is compiled. In simple terms, this means the compiler will take your .cpp file, open any files #included by it, concatenate them all into one massive text file, and then perform syntax analysis and finally it will conv...