错误“线程“AWT-EventQueue-0”中的异常java.lang.NumberFormatException”

Question

I have tried using trim() but the same error keeps appearing.

public void getSum()
    {
        int sum = 0;
        for(int i=0;i<jTable_stockinfo.getRowCount();i++)
        {
            sum  = sum + Integer.parseInt(jTable_stockinfo.getValueAt(i, 5).toString().trim());
        }
        
        jTextField_total.setText(Integer.toString(sum));
    
    }

Am I using trim() at the wrong place or must I add something else.

Answer 1

The problem likely has nothing to do with "trim()" - it's probably just "bad data".

SUGGESTION: wrapping "parseInt()" in a try/catch block might help:

EXAMPLE:

try {
  String s = jTable_stockinfo.getValueAt(i, 5).toString().trim();
  sum  = sum + Integer.parseInt(s);
} catch (NumberFormatException nfe) {
   throw new Exception ("Illegal input: " + s);
}

In my example, I re-throw the error. You'll probably want to do "something different". But the point is to a) detect when you've got illegal input, and b) preserve the illegal value, so you can take the appropriate action.