Excel 2007 : Charts and Graphs tutorial

In Microsoft Excel, you can represent numbers in a chart. On the Insert tab, you can choose from a variety of chart types, including column, line, pie, bar, area, and scatter. The basic procedure for creating a chart is the same no matter what type of chart you choose. As you change your data, your chart will automatically update.



Java: Declaring Your own Exceptions tutorial

You can create your own exceptions in Java. Keep the following points in mind when writing your own exception classes:
  1. All exceptions must be a child of Throwable.
  2. If you want to write a checked exception that is automatically enforced by the Handle or Declare Rule, you need to extend the Exception class.
  3. If you want to write a runtime exception, you need to extend the RuntimeException class.