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Java 8 NullPointerException in Collectors.toMap
The Java 8 Collectors.toMap throws a NullPointerException if one of the values is 'null'. I don't understand this behaviour, maps can contain null pointers as value without any problems. Is there a good reason why values cannot be null for Collectors.toMap ?
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Listing only directories in UNIX
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answered Sep 8 '10 at 11:45
David HancockDavid Hancock
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Ruby on Rails and Rake problems: uninitialized constant Rake::DSL
...e .9.0 breaks Rails and several other things, you need to:
gem "rake", "0.8.7"
in your Gemfile.
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Get folder name from full file path
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answered Mar 8 '11 at 6:54
Alex PacurarAlex Pacurar
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What's the difference between ASCII and Unicode?
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ASCII defines 128 characters, which map to the numbers 0–127. Unicode defines (less than) 221 characters, which, similarly, map to numbers 0–221 (though not all numbers are currently assigned, and some are reserved).
Unicode is a supers...
Grouped LIMIT in PostgreSQL: show the first N rows for each group?
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287
New solution (PostgreSQL 8.4)
SELECT
*
FROM (
SELECT
ROW_NUMBER() OVER (PARTITION BY...
Why is MySQL's default collation latin1_swedish_ci?
...n other options seem much more reasonable, like latin1_general_ci or utf8_general_ci ?
2 Answers
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Removing Java 8 JDK from Mac
So I installed the beta of JDK 8 a while ago to look at some of the examples. I thought for sure by now, it's easy to change between versions.
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Check whether number is even or odd
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Snekse
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answered Sep 8 '11 at 1:40
lucasmolucasmo
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