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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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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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what is the best type to store data from csv format file, where is 150k records(lines) where each line has 9 columns(fields). After initialize my type with these data i need to do some operations on it, like add record in specified line, or add/change some data in some field. Also i need to compare data between themselves. Thank for help!
The best type to use is an ArrayList of a domain object. The domain object has 9 properties.
In other words: don't make it generic, make it specific for your problem. Then your code will be more readable and type-safety helps you when you create the functionality.
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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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is there any way to search all methods in Java class with regex?
(public|protected|private|static|\s) +[\w\<\>\[\]]+\s+(\w+) *\([^\)]*\) *(\{?|[^;])
With this you can, but search before ask, because i only have used the search to find this answer ^^.
I think you're looking for reflection - see this tutorial for help. Only through reflection can you access information about loaded classes - unless you're thinking of loading in the .java file and analyzing its text.
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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).