05

• Exception


  An event that occurs during the execution of a program that disrupts the normal flow of instructions
• Exception handling


  The process used to change the normal flow of code execution if a specified exception occurs
• Checked exceptions


  • ClassNotFoundException
  • IllegalAccessException
  • InstantiationException
  • NoSuchMethodException
• Unchecked (runtime) exceptions


  • ArithmeticException
  • ArrayIndexOutOfBoundsException
  • ArrayStoreException
  • InputMismatchException
  • NullPointerException
  • NumberFormatException
  • StringIndexOutOfBoundsException

  
• try block


  A block of code that might throw an exception that can be handled by a matching catch block
• catch block


  A segment of code that can handle an exception that might be thrown by the try block that precedes it
• The getMessage() method can be used to determine Java's message about the exception

  
• Only one (1) try block is accepted in a program but there can be multiple catch blocks
• User-defined exception


  Created by extending the Exception class
• finally block


  Contains statements which are executed whether or not an exception is thrown
• There can only be one (1) finally block after a try-catch structure but it is not required
• A throw statement sends an exception out of a block or a method so it can be handled elsewhere