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program name unnecessary to be same as class name- c# [closed]

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I read in an online article that in java, the program file name should be same as class name. Why is that?
Also in c# i read that program file name need not be same as class name. Why?
Can someone please explain the difference?
Here is a link to the article:
https://www.tutorialspoint.com/csharp/csharp_program_structure.htm

A Java class file can contain multiple classes and you can name them whatever you want.
But ideally, following the best practices, it is better to write one class per file and name the file as per the name of the Class.

I'm new at programming. I'm not sure how much to use methods [closed]

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So, I just finished my first program, but I haven't use any methods in it, since I'm just beginning to learn how to use them. Here's the original code : http://codepad.org/JiBfJI8Q I started to fractionate it but realised that it would be a method inside another all the way down. Is that actually the way to do it, or did I get the idea wrong?

without having looked at your code:
The general idea of methods is to separate small
portions of code which might be used at multiple other places in your code.
so yes, calling methods from within other methods is a good thing to do.
ideally your so called "composed methods" read out like a little story:
public void transaction(){
openDatabaseConnection();
addRecordsToDatabase();
closeDataseConnection();
}

where java main method is defined at the starting time of below class or at middle of programme [closed]

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For example in some Java programs we use main method at below the class
in some Java programs we use main method after at writing methods what is the difference?

There is no difference if we write main method first or last. All the java programs starts the execution from the main class and it is independent from position (first or last).

there is no different, but you have to put all methods in a class...
you can read the manual :-) https://docs.oracle.com/javase/tutorial/getStarted/application/

Class with repeated buttons android [closed]

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I have several classes with the same buttons. How can I combine them into one class rather than writing them in each class?
Thanks

Make a bean class for buttons and use them using getter and setters throughout your app.
create buttons dynamically
http://theopentutorials.com/tutorials/android/listview/android-custom-listview-with-image-and-text-using-baseadapter/
this link will help you to implement such things..
That may solve ur problem :)

Is the functionality of your button are different? So you can inherit some classes from base main class and put your functionality in them. Or use one class and use a flag to decide what functionality you should use.

Method class in Java [closed]

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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).