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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.
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I have patching class dynamycly by BCEL, and them I dynamycly reload class.
I`m not sure what I really reloading class.
How can I check it?
How can I view class bytecode without save it as file?
Thanks.
I'm not sure what I am really reloading the class. How can I check it?
Well, you could print a message to System.out in static initializer in your class. If the message is printed you will know that your class has been reloaded, and the (new) class has been initialized.
How can I view class bytecode without save it as file?
See Pretty printing a method in ASM Bytecode
Whether netbeans special instruments for it?
I don't know what you are asking here ...
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Can anyone tell me how to write a java program that print itself without using file IO. I googled a lot, but I can't find the exact answer. I found some useful tips here . Is there any way to write self print program without using file IO ?
Here you can find many implementations, the first by Bertram Felgenhauer follows:
class S{public static void main(String[]a){String s="class S{public static void main(String[]a){String s=;char c=34;System.out.println(s.substring(0,52)+c+s+c+s.substring(52));}}";char c=34;System.out.println(s.substring(0,52)+c+s+c+s.substring(52));}}
By the way, this is known as a quine, a program whose output is itself.
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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).
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I'm looking to create an application that will be used to help find a suitable University for prospective students to attend (which is based on various criteria about themselves). The application will be used by prospective students to enter details about themselves and a list of Universities will be displayed based on their profile.
I'm on the design stage (class diagram and etc) and i'm currently thinking of some Java classes I need to produce to do this. So far I've only thought of two...
University class (to hold information about Universities)
Interface class (this the GUI display)
Can someone help suggest what other class that I will need to create this application? You can suggest as many as you like.
Take every noun in your application description. Make it into a class. See if you can write a more detailed description of your app. Use those nouns as classes as well.