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javaswingjtabletablecelleditor

How to make a table cell blank when the column class is float or double

I have a JTable which model was extended to AbstractTableModel. It has 4 columns. First two columns hold string and last two columns hold double type data. The last 2 columns displays 0.0 when the data is Null;

But I want to display it as blank when the value is null or 0; And when I will edit the cell and type any numerical value it will set double data type value with precision point.

col1 || col2 || col3 || col4 
-----------------------------
aaa  || a1  || 250.00||
bb   || b1  ||       || 10.5
============================

A solution may be that to change in getValueAt(int rowIndex, int columnIndex) method and return " " when columnIndex is 3 and 4. But it creates another problem. When I edit the cell it return String value and required to parse the string value to double at setValueAt(Object value, int row, int col) method with Double.parseDouble(value.toString());

But I think it is not wise or correct to parse the string value toDouble; I think setCellEditor may be a good solution. But I cant understand how to set a cell editor to double data type.

mytable.getColumnModel().getColumn(3).setCellEditor(???);

Could you give any solution.

Solution

  • You need to change the CellRenderer, not the CellEditor.

    Read from "Concepts: Editors and Renderers" here:

    http://docs.oracle.com/javase/tutorial/uiswing/components/table.html