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Relationship between hashCode and equals method in Java [duplicate]
I read in many places saying while override equals method in Java, should override hashCode method too, otherwise it is "violating the contract".
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Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip)
In JDK 8 with lambda b93 there was a class java.util.stream.Streams.zip in b93 which could be used to zip streams (this is illustrated in the tutorial Exploring Java8 Lambdas. Part 1 by Dhananjay Nene ). This function :
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Encrypt Password in Configuration Files? [closed]
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A simple way of doing this is to use Password Based Encryption in Java. This allows you to encrypt and decrypt a text by using a password.
This basically means initializing a javax.crypto.Cipher with algorithm "AES/CBC/PKCS5Padding" and getting a key from javax.crypto.SecretKeyFactory with...
Why shouldn't Java enum literals be able to have generic type parameters?
Java enums are great. So are generics. Of course we all know the limitations of the latter because of type erasure. But there is one thing I don't understand, Why can't I create an enum like this:
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Is Random class thread safe?
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A guarantee has been added in the Java 7 docs: "Instances of java.util.Random are threadsafe." docs.oracle.com/javase/7/docs/api/java/util/Random.html
– Matt R
Jul 12 '13 at 14:38
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IllegalArgumentException or NullPointerException for a null parameter? [closed]
...throw an IllegalArgumentException , or a NullPointerException ? From the javadocs, both seem appropriate. Is there some kind of an understood standard? Or is this just one of those things that you should do whatever you prefer and both are really correct?
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Array initialization syntax when not in a declaration
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Why is this blocked by Java?
You'd have to ask the Java designers. There might be some subtle grammatical reason for the restriction. Note that some of the array creation / initialization constructs were not in Java 1.0, and (IIRC) were added in ...
Initializing multiple variables to the same value in Java
... thing (especially the multiple assignments) would be frowned upon by most Java developers, who would consider it the opposite of "visually simple".
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How do I count the number of occurrences of a char in a String?
...is (a) requiring 3rd party libs and (b) expensive.
– javadba
Jan 23 '14 at 21:24
This only work with spring frame work...
Regular expression to match URLs in Java
...RLs. I tested successfully within RegexBuddy. However, when I copied it as Java String flavor and pasted it into Java code, it does not work. The following class prints false :
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