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What is the difference between an interface and a class, and why I should use an interface when I ca
... is a very basic question, but an interviewer asked me in a very trick way and I was helpless :(
16 Answers
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Should I use a class or dictionary?
I have a class that contains only fields and no methods, like this:
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“PKIX path building failed” and “unable to find valid certification path to requested target”
...got an error about certificate sun.security.validator.ValidatorException and sun.security.provider.certpath.SunCertPathBuilderException . Then I added twitter certificate by:
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equals vs Arrays.equals in Java
...ntents of the arrays.
Similarly array.toString() may not be very useful and you need to use Arrays.toString(array).
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How do I reload .bashrc without logging out and back in?
If I make changes to .bashrc , how do I reload it without logging out and back in?
17 Answers
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How to compare dates in Java? [duplicate]
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Date has before and after methods and can be compared to each other as follows:
if(todayDate.after(historyDate) && todayDate.before(futureDate)) {
// In between
}
For an inclusive comparison:
if(!historyDate.after(todayDate) ...
Pimpl idiom vs Pure virtual class interface
...would make a programmer to choose either Pimpl idiom or pure virtual class and inheritance.
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Difference between clustered and nonclustered index [duplicate]
I need to add proper index to my tables and need some help.
6 Answers
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What's the best three-way merge tool? [closed]
Subversion, Git, Mercurial and others support three-way merges (combining mine, theirs, and the "base" revision) and support graphical tools to resolve conflicts.
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Why fragments, and when to use fragments instead of activities?
In Android API 11+, Google has released a new class called Fragment .
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