Types of Errors

• Syntax
• Run-Time (these show up as Exceptions in Java)
• Logic

Exception Class Hierarchy

• Throwable
  • Error
  • Exception
    • RunTimeException (unchecked)
    • other exceptions (checked)

• Look at Throwable class methods
• Error: due to serious external conditions, e.g. computer is out of memory
• Unchecked Exception: typically due to a programming error, e.g. divide by zero
• Checked Exception: typically not due to programmer error, e.g. unavailable data file
• Look at Figure 2.2

Catching and Handling Exceptions

• try-catch construct
• try-catch-finally construct

Class Code

• Driver.java
• ReadNumber.java