Little help thanks in advance! :D

[Itsjustme_oOo]

Ok, my problem is I have an issue with a button on my program.

I have a JTable I need to read, the problem is, everytime I try to, a Null Pointer Exception jumps out, and then reads the first line of the JTable. The problem, I don't want that exception to jump everytime the JTable has a null space.

this is my code on the for loop to read the JTable:

    for(int z=0;z<tablaGenera.getRowCount();++z)
    {
        for(int y=0;y<tablaGenera.getColumnCount();++y)
        {
            String tabla= tablaGenera.getValueAt(z,y).toString();
            System.out.print(tabla+",");
        }
    }

Please help me, I perhaps am missing something I didn't learned well. If I have only 1 line on the JTable, I get the NullPointer Exception, but if my Table is all filled with data (no null spaces) then I get no Exception. And what I need is it to read without any error even if there's only 1 line.

Thanks in advance :3

[ProgramThis]

The problem is that you are trying to call the .toString() method on objects that are null. You can prevent this, or catch this.

Prevent:
if(table.getValueAt(x,y) != null) {
table.getValueAt(x,y).toString();
}


Catch it (not recommended)
try {
table.getValueAt(x,y).toString();
} catch(NullPointerException e) {
//silently ignore the expected error
}

[Itsjustme_oOo]

Ok, thx very much.. it helped me a lot! :3