java : convert string value to int -

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to JTable , I follow the row for [row 1] and calculate the values Do: 

  Last Array List & lt; String & gt; Value = new array list & lt; String & gt; (); End end nb = myTable.getRowCount (); Int sum = 0; (Int i = 1; i & lt; nb; i ++) for {string column = value = myTable.getColumnValue (i, columnName); Yoga = Yoga + Integer.parseInt (columnValue); Value list Add (column value); }   
 But I found:  
  java.lang.NumberFormatException: for input string: "java.lang.NumberFormatException.forInputString (unknown source) Java.lang.Integer.parseInt (unknown source) at Java.lang.Integer.parseInt (unknown source)    
 
 
 Your table contains at least one empty cell.  
 Here's a suggestion:  
  Try {sum + = integer.parseont (columnValue) );} Hold (Number Format Expection NFE) {// Cell is either empty or not an integer number //   
 
 Note, method  getColumnValue (int i, string name)   javax.swing. JTable is not defined for . If you use the subclass of  JTable , then there may be an error in that class / method: it is a blank in place of the cell value The string can return.

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