• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
  • Mikalai Zaikin

JTable and getValueAt(int, int)

Posts: 8
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I'm having trouble trying to sum values accross the rows in a JTable.
I extended DefaultTableModel for my tableModel then returned a ResultSet via SQLJ to populate the table. The data displays when I run the Applet and I have overridden isCellEditable making cells 1 to 8 editable. Structure of the table is as follows:
ID, Project, hrsMon hrsSun,.................................total hrs
int, String, float, float, float, float, float, float, float, float
The first(0) and last(9) columns are not editable. The last column(9) a float is the total. So when a user puts a value in 2-8 and presses enter
the total should be calculated anew.
currently I have something like this:
public Object getValueAt(Float newVal,int row, int col)
BigDecimal sum = new BigDecimal(1);
if(col == 9) // Total column

//sum = new BigDecimal(Float.parseFloat((String)getValueAt(row, 2)) + Float.parseFloat((String)getValueAt(row, 3))
// + Float.parseFloat((String)getValueAt(row, 4)) + Float.parseFloat((String)getValueAt(row, 5))
// + Float.parseFloat((String)getValueAt(row, 6)) + Float.parseFloat((String)getValueAt(row, 7))
// + Float.parseFloat((String)getValueAt(row, 8)));

//sum = BigDecimal.valueOf(Long.parseLong((String)getValueAt(row,2)));
catch (Exception e)
// sum = new BigDecimal(0);


return sum;
return super.getValueAt(row, col);


I finally had to comment out the calculation because i could not get it to compile. I've changed it so many times that I cannot get the code to work. I don't know if BigDecimal is what I want to return or maybe Object or Float? Float makes sense to my newbie mind as that is the type of the field in the database.
Any help is greatly appreciated.
Don't get me started about those stupid light bulbs.
    Bookmark Topic Watch Topic
  • New Topic