How to add and delete table in java

Question

I have a code for making table and sort the data that input there. What if I want to add some action using button to add the row than fill the data and can delete the row too. Here is my code:

public class TableSortDemo extends JPanel {
    private boolean DEBUG = false;

    class MyTableModel extends AbstractTableModel {
        private String[] columnNames = {"Nama",
                                        "NIM",
                                        "IPK"};
        private Object[][] data = {
        {"", new Integer(0),new Double(0)}
        };

        public boolean isCellEditable(int row, int col) {
            if (col < 2) {
                return false;
            } else {
                return true;
            }
        }
        public void setValueAt(Object value, int row, int col) {
            if (DEBUG) {
                System.out.println("Setting value at " + row + "," + col
                                   + " to " + value
                                   + " (an instance of "
                                   + value.getClass() + ")");
            }

            data[row][col] = value;

        }

        private void printDebugData() {
            int numRows = getRowCount();
            int numCols = getColumnCount();

            for (int i=0; i < numRows; i++) {
                System.out.print("    row " + i + ":");
                for (int j=0; j < numCols; j++) {
                    System.out.print("  " + data[i][j]);
                }
            }
        }
    }

HashMap caused some issues with sorting, inserting row at index, etc — mKorbel, May 21 '13 at 10:59
Sorting shouldn't effect the physical model and should be done virtually — MadProgrammer, May 21 '13 at 11:03
@MadProgrammer aaaaach I'm really don't want to win, but I can't resist, one of [describtions here](http://stackoverflow.com/a/14156223/714968) by (@Robin), another are you can to searching (if I remember correctly) in posts by (@JB Nizet) — mKorbel, May 21 '13 at 11:17

score 1 · Accepted Answer · edited May 23 '17 at 12:14

For JTable based on AbstractTableModel is required to override
- public void addRow(Object[] rowData) with proper notifiers (then after is new row displayed in JTables view) fireTableRowsInserted(int firstRow, int lastRow),
- public void removeRow(int row) with proper notifiers (then after is deleted row removed from JTables view) fireTableRowsDeleted(int firstRow, int lastRow)
I'd be use DefaultTableModel (see my post, how easy everything could be), strongly recomend for newbee
everything is described in JTable tutorial, rest is (correctly) in concrete APIs

score 0 · Answer 2 · answered May 21 '13 at 11:05

Firstly, why don't you use an ArrayList to represent your entities being displayed in the rows. Instead of :

private Object[][] data = {
{"", new Integer(0),new Double(0)}
};

Have something like :

private ArrayList<Thing> myThings;

It makes things soooo much simpler.

If you want to add or remove rows, then just add two methods to the table model such as :

public void addThing(Thing t) {..}
public void removeThing(Thing t) {..}

And follow it up with a fireTableDateChanged();

From a performance point of view, it would be better to use fireTableRowsInserted/deleted — MadProgrammer, May 21 '13 at 11:09

How to add and delete table in java

2 Answers2