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What is the difference between Collectors & Collector. I know that one is interface & one is class. I want to know with example what is the actual difference and When to use which one with real time example.
Hi all I already mentioned in my question I know the basic difference and I gone through the documentation also, I just want to know the purpose to introduce this two thing with example and When should use which one?
Collectors is just a class with static methods which create commonly used Collectors.
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I am realizing that in my project I am using two libraries that, essentially, do the same thing:
1) org.mockito.Mockito.any
2) org.mockito.Matchers.any
I'd like to use just one of them to be clearer, which one should I stick to?
Thanks!
Mockito is a sub class of Matchers that's why you can still access the parent's static method like you did.
So I suggest you stick with Matchers.any() since that is where the implementation is located.
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I've been trying to mess around with generics and get a way to handle multiple database types example: Database so the class where this will be declared will be a MongoDB database class.
How can I implement this? Are generics the answer to handler better multiple database types?
Your question cannot have a right answer, because there could be many ways to achieve a good result. Generics could be a way, you can read how Spring Data created something like this from this link
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There are several methods to create Instance in Java
(Different ways are new operator, cloning, reflection and DE-serialization etc)
So among them which is the fastest of all ?
In such a case fastest means which one of those executes less operations before actually allocating the memory for the object. It is easy to determine that new is the fastest among those because it doesn't bear the overhead created from the others such as clone etc.
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I need a thread-safe Queue and my question is that are there any performance difference between the queue I implement using List and wait/notify (simplest implementation) and classes such ArrayBlockingQueue and etc.?
The question is too vague to be answerable. Here is my advice:
If there is a standard class that does the job, use it in preference to rolling out your own.
Profile your code on realistic inputs to see where the bottlenecks are.
Optimize as appropriate.
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I am currently working on a project where I found this syntax:
Method m = bluetoothDevice.getClass().getMethod("createBond", (Class[]) null);
What is the purpose of "Method" class in Java and why we use it? Please elaborate with an example
Thanks in advance!
PS: I already saw the Java docs but not able to understand it.
The Method class is part of the "reflection" API which is about meta-programming. That means you can deal with structures of your program as data and process it in a java program. This allows flexible generic or abstract solutions. Method itself just represents a method in a Java class. There are other classes representing other parts of Java programs, too (e.g. Class).