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Why is the Java main method static?
...ntire class - sometimes you have an instance that hasn't been initialized, and you have to check for it in every method that could be called.
There are just too many edge cases and ambiguities for it to make sense for the JVM to have to instantiate a class before the entry point is called. That's ...
Which concurrent Queue implementation should I use in Java?
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Basically the difference between them are performance characteristics and blocking behavior.
Taking the easiest first, ArrayBlockingQueue is a queue of a fixed size. So if you set the size at 10, and attempt to insert an 11th element, the insert statement will block until another thread remove...
Why do we need a pure virtual destructor in C++?
I understand the need for a virtual destructor. But why do we need a pure virtual destructor? In one of the C++ articles, the author has mentioned that we use pure virtual destructor when we want to make a class abstract.
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Is there a difference between foreach and map?
...eturns another list of the same size with the transformed members (such as converting a list of strings to uppercase)
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Why am I seeing “TypeError: string indices must be integers”?
... to get github issues into a readable form. Using the advice on How can I convert JSON to CSV? I came up with this:
6 Ans...
When to use Hadoop, HBase, Hive and Pig?
...n to my answer. No self promotion intended)
Both Hive and Pig queries get converted into MapReduce jobs under the hood.
HTH
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Creating temporary files in bash
...standard, but it does exist on many platforms. The "X"s will generally get converted into some randomness, and more will probably be more random; however, some systems (busybox ash, for one) limit this randomness more significantly than others
By the way, safe creation of temporary files is impor...
How to prevent buttons from submitting forms
...be used PHP sessions and neither cookies are allowed!
So any link must be converted to such form submit, so the login data is not lost.
When no login is yet done, it must also work. So no validation must be performed on links.
But I want to present a message to the user if the user has not entered ...
Why use getters and setters/accessors?
What's the advantage of using getters and setters - that only get and set - instead of simply using public fields for those variables?
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What's the difference between String(value) vs value.toString()
...cation, the [[DefaultValue]] internal operation.
Briefly summarized, when converting from Object-to-String, the following steps are taken:
If available, execute the toString method.
If the result is a primitive, return result, else go to Step 2.
If available, execute the valueOf method.
If t...