How to display a 2D array using JTable and take in data from textFields

[civic heath]

Hello! I am currently trying to display the results of my calculator using a TableModel.
I know my code looks wacky but I just want to get it working and I'm frustrated.
Thank you so much for anyone that could help me spot any logical errors I may have missed and for helping in solving my predicament.

Currently it only displays the column title .
I appreciate any tips I can get to get my midterms project over. ❤️

[vale gazelle]

Hey, @civic heath!
Please remember to /close this post once your question has been answered!

[short sparrow]

replace Object rows[][] = {} with :

Object rows[][] = Arrays.stream(array).map(x -> Arrays.stream(x).boxed().toArray(Object[]::new)).toArray(Object[][]::new);

This will basically convert your primitive double array to an Object array which you can then pass as constructor argument to the DefaultTableModel.

[civic heath]

Thank you so much for the suggestion! However, I still cannot seem to take in user input from my text fields.

Sample outputs:

How to display a 2D array using JTable and take in data from textFields

[short sparrow]

The code you linked is about GUI and creation of the JTable. ^This however looks like a scanner was used to get the user input.

[civic heath]

yes, in my solveForJacobi and solveForGauss method there is a scanner to output for debugging purposes

however, I need to get it working with GUI 😅

[short sparrow]

have you confirmed the contents of the array passed into the tableView method ?

[civic heath]

I believe it hasn't because no matter what I have input in my text fields the output is always the same. And I'm unsure where I have messed up in my loops 😅 Its currently 4 am where I'm at so I have decided to ask around for help.

[short sparrow]

could you confirm the array given to the method using :

System.out.println(Arrays.deepToString(array));

[civic heath]

Thank you, I have found an error in my code. Its not necessarily in the display but in trying to separate the right hand and left hand side of the equation. [rightHandSide and leftHandSide] I have tried it on my initial console output program and it is quite different. I may just have a logical error.

this is the expected output

I'm unsure why this says 'output is always false'

[short sparrow]

because the loop is only up to the length and you check if j is equal to the length.

[civic heath]

yes but I dont think that should be the case however it is because of a logical error on my part that I do not know how to solve 😅

[short sparrow]

I am actually not sure what you are actually trying to do.

[civic heath]

Oh boy HAHA English isn't my first language I'm sorry if I'm confusing. I just cant seem to take in input from my text fields at the moment

and afterwards, I wish to display the result into a jtable

[short sparrow]

No no not your current problem I understood that I am just wondering what you are trying to achieve with the code overall .

It seems a little bit convoluted at the moment.

[civic heath]

Ah it is a Gauss-Seidel and Jacobi calculator

Forgive me for the rustiness of the code, I'm clearly a novice

[short sparrow]

its not that. I am just trying to understand what we are actually trying to achieve here.

[civic heath]

Wdym?

I need to take in input from my text fields, and from what I have tried it doesn't seem to work. And once passed through a method to solve the matrix, I wish to display the results into a Jtable.

Rn, from your previous question wherein you asked me to see if the array has taken an input. Apparently, there is an error within my for-loops and I wish to ask for help regarding so.

[short sparrow]

yeah but you have only showed me the input via the console not via the gui

[civic heath]

this is the current output in the gui

[civic heath]

this is also the output of my code in my gui which doesnt seem to work in retrieving the right and lefthand side of the equation

[short sparrow]

I see its just weird that you don't get any kind of output even though the array contains something when the method tableView()is called.

[short sparrow]

You did check that the array contains at least something in the tableView() method, right ?

[civic heath]

yes I did

[short sparrow]

What is contained in the array passed to the method. Currently I assign the array to be the data of the table but I dont know if that is what you intended

[civic heath]

yes that is what I intended however currently, the output is []

[short sparrow]

so the array passed to the method is empty ?

[civic heath]

Mhm, and I do not know exactly why

[short sparrow]

could you post an update on this piece of code ?

[civic heath]

I dont have an update on that piece of code currently 😅 that is all I got rn

[short sparrow]

ok then we need to talk about the logic in here. What is this nested loop doing ?

[civic heath]

to retrieve the text from the input textfields

[short sparrow]

could you give me input and expected output for that for-loop ?

[civic heath]

Example: I input the following in the GUI. What the loops should do is rightHandSide should only contain [21,8]. while leftHandSide should contain [2,18], [1,2]

however, this is their current output

[short sparrow]

how are the Jtextfields ordered ?

0,1,2 is the first row and 3,4,5 is the second row ?

[civic heath]

yes

[short sparrow]

alright let me quickly think of something

[short sparrow]

Alright this code should work

        double[] temp = new double[testnum];
        for(int i = 0, right = 0, left = 0, leftArr = 0; i < input.length; i++ ) {
            if((i+1) % (testnum+1) == 0) {
                rightHandSide[right] = Double.parseDouble(input[i].getText());
                right++;
            } else {
                temp[leftArr] = Double.parseDouble(input[i].getText());
                leftArr++;
                if(leftArr == testnum) {
                    leftHandSide[left] = temp;
                    temp = new double[testnum];
                    leftArr = 0;
                    left++;
                }
            }
        }

[civic heath]

hello, sorry I passed out

Sorry I cant seem to get my copy paste working but I got an exception error

            String[] options = {"Gauss-Seidel", "Jacobi"};
            StringBuilder string = new StringBuilder();
            this.inputPanel.setLayout(new GridLayout(testNum, col));
            JOptionPane.showMessageDialog(null, "Creating matrix");

            //create textField matrix
            for (int a = 0; a < col; a++) {
                for (int b = 0; b < testNum; b++) {
                    input[b] = new JTextField(3);
                    input[b].setPreferredSize(new Dimension(100, 20));
                    if (b == testNum - 1) {
                        string = new StringBuilder("x" + (b + 1) + " " + "=");
                    } else {
                        string = new StringBuilder("x" + (b + 1) + " " + "+");
                    }

                    this.inputPanel.add(input[b]);
                    this.inputPanel.add(new JLabel(String.valueOf(string)));
                }
                input[a] = new JTextField(3);
                this.inputPanel.add(input[a]);
            }```

I believe its how my my text fields are initialized

[civic heath]

Update: I was able to fix it by configuring my textfields into a 2d array phew

now for my gui