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java: (String[])List.toArray() gives ClassCastException
... IntelliJ, I get a warning to use toArray(new String[0]) rather: "In older Java versions using pre-sized array was recommended as the reflection call which is necessary to create an array of proper size was quite slow. However since late updates of OpenJDK 6 this call was intrinsified, making the pe...
Is there any performance reason to declare method parameters final in Java?
Is there any performance reason to declare method parameters final in Java?
5 Answers
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Volatile Vs Atomic [duplicate]
... the truth of this assertion. Individual reads and writes to variables in Java that are not 8-bytes are always atomic. The volatile keyword does not make accesses to variables that may not have otherwise been atomic into accesses that are. It merely forces the processing environment to immediatel...
Naming convention for utility classes in Java
When writing utility classes in Java, what are some good guidelines to follow?
5 Answers
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Golang: How to pad a number with zeros when printing?
...d one will pad with spaces.
You can see it in action here: http://play.golang.org/p/cinDspMccp
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Java: using switch statement with enum under subclass
...te that I'm much more familiar with enums in C# and it seems like enums in java is a quite mess.
6 Answers
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How to permanently export a variable in Linux?
...e following locations:
System-wide persistent variables in the format of JAVA_PATH=/usr/local/java store in
/etc/environment
System-wide persistent variables that reference variables such as
export PATH="$JAVA_PATH:$PATH" store in
/etc/.bashrc
User specific persistent variables in the format o...
How can we match a^n b^n with Java regex?
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The answer is, needless to say, YES! You can most certainly write a Java regex pattern to match anbn. It uses a positive lookahead for assertion, and one nested reference for "counting".
Rather than immediately giving out the pattern, this answer will guide readers through the process of deri...
Biggest differences of Thrift vs Protocol Buffers?
...ant difference are the languages supported by default.
Protocol Buffers: Java, Android Java, C++, Python, Ruby, C#, Go, Objective-C, Node.js
Thrift: Java, C++, Python, Ruby, C#, Go, Objective-C, JavaScript, Node.js, Erlang, PHP, Perl, Haskell, Smalltalk, OCaml, Delphi, D, Haxe
Both could be exte...
Java 8 Distinct by property
In Java 8 how can I filter a collection using the Stream API by checking the distinctness of a property of each object?
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