How to duplicate or copy data on my first Jframe table to second jframe table?

Question

My problem is this. I have a table on my first JFrame and now I want the data on my first table to be duplicated on the table of my second JFrame. I'm using GUI, I have 2 JFrames, both JFrames have tables and i want both tables to display same data.

I have come up to this solution but I don't know how to set the data on my second table.

This is the code:

public Object[][] getTableData (JTable table) {
    TableModel dtm = table.getModel();
    int nRow = dtm.getRowCount(), nCol = dtm.getColumnCount();
    Object[][] tableData = new Object[nRow][nCol];
    for (int i = 0 ; i < nRow ; i++)`enter code here`
        for (int j = 0 ; j < nCol ; j++)
            tableData[i][j] = dtm.getValueAt(i,j);
    return tableData;
}

How do I solve the problem?

To make it more clear. ill attach photo

this is my first JFrame Photo

this is my second JFrame

my second jframe is just a summary of what is being entered in first JFrame. that is the reason why i use 2 JFrames.

i have 2 JFrame forms. in First JFrame Form i have this Code, i tried to modify the code above a bit.

public Object[][] getEquipTableData () {
    TableModel dtm = equipmentBorrowTable.getModel();
    int nRow = dtm.getRowCount(), nCol = dtm.getColumnCount();
     tableDataE = new Object[nRow][nCol];
    for (int i = 0 ; i < nRow ; i++)
        for (int j = 0 ; j < nCol ; j++)
            tableDataE[i][j] = dtm.getValueAt(i,j);
    return tableDataE;
}

and then at the second JFrame i have this partof code

 public StudentSumarry() {
        StudentModeDashboard SMD = new StudentModeDashboard();
        String[] columnNames = {"Employee 1", "Employee 2", "Employee 3", "Employee 4"};
        Object[][] firstTableData = SMD.getEquipTableData();
        initComponents();
           equipmentBorrowTable2.setModel(new DefaultTableModel(firstTableData, columnNames));
}

i instantiate my JFrame1 on JFrame2 to use the method getEquipTableData() on JFrame1. IDK if what im doing is right.

Answer 1

First and foremost take some time to read if multiple JFrames is good or bad practice.

Secondly, you can change the TableModel of the second JTable, by using setModel() method passing a DefaultTableModel. The getTableData method you have created seems to be ok in order to achieve something like this.

Object[][] firstTableData = getTableData(firstTable);
secondJTable.setModel(new DefaultTableModel(firstTableData, columnNames));

(After some comments taking place):

SSCCE:

public class JTables {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("Frame 1");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JTable table = new JTable(randomData(), new String[] { "FirstTableCol1", "FirstTableCol2" });

            frame.setLayout(new BorderLayout());
            frame.add(new JScrollPane(table));

            JFrame frame2 = new JFrame("Frame 2");
            frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JTable table2 = new JTable(randomData(), new String[] { "SecondTableCol1", "SecondTableCol2" });

            frame2.setLayout(new BorderLayout());
            frame2.add(new JScrollPane(table2));

            JButton button = new JButton("copy");
            button.addActionListener(e -> {
                Object[][] data = getTableData(table);
                table2.setModel(new DefaultTableModel(data, new String[] { "SecondTableCol1", "SecondTableCol2" }));
            });
            frame.add(button, BorderLayout.PAGE_END);

            frame.pack();
            frame.setVisible(true);
            frame2.pack();
            frame2.setVisible(true);
        });
    }

    private static Object[][] randomData() {
        Object arr[][] = new Object[5][2];
        for (int i = 0; i < arr.length; i++) {
            arr[i][0] = String.valueOf((int) (Math.random() * 10000));
            arr[i][1] = String.valueOf((int) (Math.random() * 10000));
        }
        return arr;
    }

    public static Object[][] getTableData(JTable table) {
        TableModel dtm = table.getModel();
        int nRow = dtm.getRowCount(), nCol = dtm.getColumnCount();
        Object[][] tableData = new Object[nRow][nCol];
        for (int i = 0; i < nRow; i++)
            for (int j = 0; j < nCol; j++)
                tableData[i][j] = dtm.getValueAt(i, j);
        return tableData;
    }

}