How can I devide a class java into many classes? [closed] - java

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I have a main class with over 600 lines code :/ ! my app contains a toolbar,menubar and a field to draw a network nodes
how can I devide my main class and what criteria to choose fo dividing ?

Good evening,
if I understand your question well, I may advice you to read the "Clean Code " of Robert C.Martin. It is a great agile book, that can help your to divide your code.
Good luck

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Is it possible to use IPOPT without Jacobian matrix? [closed]

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I am writing a program with IPOPT in Java and due to the nature of the problem, it is rather difficult to provide a Jacobian matrix.
The question is basically the title:
Is it possible to use IPOPT without Jacobian matrix and if so how?
i couldn't find anything in the documentation, but maybe i am just blind.

Java large inputs and outputs [closed]

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I have been working on a java algorithm and I want to improve it by allowing it to accept and process very large String values.
Could you suggest me any good ways of storing the input/output results. I've been thinking of writing it on a file with the readLine(), writeLine() methods? Is this a good technique ???
I recommend you to store all your string in a text file (if possible) and use BufferedReader utilities ...
here is the a link to how its done :
https://www.tutorialspoint.com/java/io/bufferedreader_readline.htm

How to make a 4x4 sudoku solver in java [closed]

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Can you guys give me some ideas for algorithm for 4x4 sudoku solver in java laugauge. I am currently having diffcultly in figuring out a agorithm. I have read wikipedia page for 9by9 solver, but maybe you guys can simplify the idea of it
Here's a page that explains this with a 4x4 grid. By the way, you really should try Googling before asking a question here. I just searched "sudoku solver example program" to find this.
http://www.mathworks.com/company/newsletters/articles/solving-sudoku-with-matlab.html

huffman without using node [closed]

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I'm thinking on possibility of making a Huffman code without "node".
It's based on the nodes then my question seems a bit ambiguous.
I know,maybe we have to use string's abilites ...
Is it possible ? and if "YES" how Is it possible in java?
Thanks.
You can use indices instead of nodes but you need somewhere nodes and/or vertices.

How to construct a JTextArea [closed]

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I am a very new programmer, it is part of my degree requirements and I am having a hard time with it. I am working on basically a three part GUI and I am wondering how I would create a JTextArea that will display each item that is entered.
Start by taking a look at Creating a GUI With JFC/Swing, this will give you a basic grounding in how to use Swing.
Take a closer look at How to Use Text Areas for specific details about how to use JTextArea

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