JTable help

The line with the error has to be inside some method or constructor:// Use capital letters to start class names

class MyClass extends JPanel implements TableModelListener {

String[] columnNamesA = {"col 1", "col 2","col 3"};

Object[][] dataA = {"1", "2", "3", "4", "5", "6"};

JTable tableA= new JTable(dataA, columnNamesA);

// The initialisation of columnsNamesA, dataA and

// tableA could go in the constructor as well

MyClass()

{

tableA.getModel().addTableModelListener(this);

}

public update()

{

tableA.getModel().setValueAt("12", 0, 1 );

}

// A TableModelListener has to have a method like this

public void tableChanged(TableModelEvent e)

{

}

}

pbrockway2a at 2007-7-15 2:45:26 >

> Now i have no compilation errors

> but, the update didn't appear in the table

There's nothing in your code so far that would cause the table's data to be

updated. The line of code you are using in update() looks OK, but update()

is not being invoked at any time. No update(), no change in the table.

A TableModelListener is probably the wrong sort of thing to be updating the

table. As its name suggests, a TableModelListener listens to changes

in the data that a table contains. It isn't designed to cause the table to change,

rather it responds to changes initiated elsewhere.

It looks like you need:

(1) A JFrame to display

(2) A JTable to put in the frame

(3) A JButton or some other control to initiate the data change.

The button (or whatever) will use the line of code that you currently have

in update() to change the data in the table. And the table (which is a

TableModelListener) will update itself.

There is a nice example of all this in Sun's tutorial here:

http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#modelchange

pbrockway2a at 2007-7-15 2:45:26 >