CODEWITHSUNDEEP
javaswingjtable
joppiealiw
joppiealiw

Reputation: 43

Making a JTABLE column uneditable

I named my JTable tblList and I wanted a certain column to be not-editable. I have found the below code that should do the job however, i cannot for the life of me make it work on my existing table. I guess my question in particular is, how do I call the below codes to be set on my existing table named tblList?

JTable model = new JTable(){

    @Override
    public boolean isCellEditable(int row, int column){
        return column==3 false;
    };
};

Upvotes: 0

Views: 1250

Answers (1)

Prashant
Prashant

Reputation: 5403

The way of doing this would be to have your own TableModel and override the public boolean isCellEditable(int rowIndex, int columnIndex);. As a rule of thumb, we should not override a JTable method. For your reference, this is what JTable does - delegates the call to the data model:

    public boolean isCellEditable(int row, int column) {
        return getModel().isCellEditable(convertRowIndexToModel(row),
                                         convertColumnIndexToModel(column));
    }

The way we do it is: Step 1: Create a Table model:

public class SimpleTableModel extends DefaultTableModel {
    @Override
    boolean isCellEditable(int row, int col) {
        // Your logic goes here
    }
}

Step 2: Pass an instance of this class to the constructor of JTable

JTable table = new JTable (new SimpleTableModel());

Please find a working example below (this is not the way I usually write code and nor should you but just to give you an example):

    static class Table extends JFrame {
        public Table() {
            String[] columns = new String[] {
                "Id", "Name", "Hourly Rate", "Part Time"
            };

            //actual data for the table in a 2d array
            Object[][] data = new Object[][] {
                {1, "John", 40.0, false },
                {2, "Rambo", 70.0, false },
                {3, "Zorro", 60.0, true },
            };

            TableModel m = new AbstractTableModel() {

                @Override
                public Object getValueAt(int rowIndex, int columnIndex) {
                    return data[rowIndex][columnIndex];
                }

                @Override
                public int getRowCount() {
                    return data.length;
                }

                @Override
                public int getColumnCount() {
                    return data[0].length;
                }

                @Override
                public boolean isCellEditable (int row, int col) {
                    return false;
                }

            };

            //create table with data
            JTable table = new JTable(m);

            //add the table to the frame
            this.add(new JScrollPane(table));

            this.pack();
            this.setVisible(true);
        }
    }

Upvotes: 2

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