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Private and protected constructor in Scala
...ease tell me whether this is presented in one of the scala books or in the language specification? Sorry I can't upvote yet.
– Don Mackenzie
Nov 13 '09 at 17:31
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What happens when a duplicate key is put into a HashMap?
...bject, that object becomes eligible for garbage collection. Additionally, Java returns any previous value associated with the given key (or null if none present), so you can determine what was there and maintain a reference if necessary.
More information here: HashMap Doc
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Does Java have something like C#'s ref and out keywords?
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No, Java doesn't have something like C#'s ref and out keywords for passing by reference.
You can only pass by value in Java. Even references are passed by value. See Jon Skeet's page about parameter passing in Java for more deta...
What is the best Java email address validation method? [closed]
What are the good email address validation libraries for Java? Are there any alternatives to commons validator ?
19 Answe...
Why is it not possible to extend annotations in Java?
I don't understand why there is no inheritance in Java annotations, just as Java classes. I think it would be very useful.
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Truststore and Keystore Definitions
.... You can actually import a private key and a public certificate into the [java home]/jre/lib/security/cacerts default "truststore". The keytool utility does not make a distinction in the two terms, only in store types (i.e. - JKS vs. PKCS12). For that matter, Java does the same thing in the source ...
Retrieving a List from a java.util.stream.Stream in Java 8
I was playing around with Java 8 lambdas to easily filter collections. But I did not find a concise way to retrieve the result as a new list within the same statement. Here is my most concise approach so far:
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Make header and footer files to be included in multiple html pages
...Query. Or is there a .breathe(in) and .breathe(out) already? Any scripting language is pure overkill here.
– The Conspiracy
Apr 24 '15 at 22:38
6
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Open Source Java Profilers [closed]
What can you guys recommend to use with Java?
12 Answers
12
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Java: Clear the console
Can any body please tell me what code is used for clear screen in Java? For example in C++
14 Answers
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