Question

I am getting a “Cannot Find Symbol” error for rowData, and columnLabels. Is the reason I am getting this error because there is no value yet for the two variables? I figured that once I created arrays they would be null until the function was called with a ResultSet object.

import javax.swing.*;
import java.awt.*;
import java.sql.*;

public class Testing
{
     public static JTable getTable(ResultSet rs)
     {


     //get data from the resultSet using metaData and place into the arrays

     try
     {
          ResultSetMetaData metaData = rs.getMetaData();
              int numberOfColumns = metaData.getColumnCount();
          int numberOfRows = rs.getRow();

          String[] columnLabels = new String[numberOfColumns];
          Object[][] rowData = new Object[numberOfRows][numberOfColumns];   

          for (int column = 0; column < numberOfColumns; column++) {
              columnLabels[column]= metaData.getColumnLabel(column + 1);
              }//end of for loop

          for(int x = 1; x <= numberOfRows; x++)
          {
          for(int y = 1; y<=numberOfColumns;y++){
              rs.absolute(x);
      rowData[x][y] = rs.getObject(y);}
          }//end of loop
     }catch(SQLException sqlException){
      sqlException.printStackTrace();
     }//end of catch

     JTable table = new JTable(rowData,columnLabels);
     return table;
    }//end of getTable;
}//end of testing

Answer 1

You’ve got a scope problem. rowData etc are declared inside of the try block and are visible only in the try block. A possible solution: declare the variable before the try block.