Getting value from JTable as Integer?

Question

I don't get it; I'm using the DefaultTableModel, and my attempt was this to get the value in a tabel as an int:

Integer.parseInt( tableModel.getValueAt(i, 1) );

Eclipse is saying there is a cast needed from Object to String, so eclipse makes that:

Integer.parseInt( (String) tableModel.getValueAt(i, 1) );

At runtime, the program crashes because it is not possible to cast "int to string". Why? I expected "object -> string -> int".

Why would you first convert the Integer to String and then back to Integer? — tobiasbayer
– tobiasbayer, Commented Feb 17, 2013 at 13:28
Please edit your question to include an sscce that shows how you add data to your DefaultTableModel and a complete stack trace of any error you encounter. Otherwise respondents can only speculate. — trashgod
– trashgod, Commented Feb 17, 2013 at 16:49

Maxim Shoustin · Accepted Answer · 2013-02-17 13:19:15Z

4

Try to use:

Integer.parseInt( tableModel.getValueAt(i, 1).toString() );

Just set string representation of the object by using toString().

answered Feb 17, 2013 at 13:19

Maxim Shoustin

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1 Comment

Anonymous Over a year ago

Stupid... I thought too much in c/c++, of course my cast did not work.

tobiasbayer · Accepted Answer · 2013-02-17 13:27:45Z

3

The value you are getting by tableModel.getValueAt(i, 1) already is an Integer. Just cast it appropriately: Integer value = (Integer) tableModel.getValueAt(i, 1); (or int if you want to use the primitive type).

edited Feb 17, 2013 at 13:27

answered Feb 17, 2013 at 13:16

tobiasbayer

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2 Comments

hd1 Over a year ago

No, tableModel.getValueAt(i, 1) returns an Object by default, per javadoc.

tobiasbayer Over a year ago

In OPs case it is an Integer. Otherwise he would not get the ClassCastException he describes.

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