Exception Handling In Java
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Exception Handling In Java

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These slides explain how Java supports Exception handling

These slides explain how Java supports Exception handling

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    Exception Handling In Java Exception Handling In Java Presentation Transcript

    • Exception Handling In Java
        • Parag Shah
        • Adaptive Software Solutions
    • Introduction
      • Why is Exception Handling important
      • How errors and exceptional conditions were handled in C.
      • Approach to Exception handling in Java
    • Exception Classes
      • Exceptions are objects
    • Exceptions – Under The Hoods
      • What happens when an Exception is thrown
    • Dealing With an Exception
      • Catching the Exception
        • The try - catch block
            • Single catch (see SimpleException.java)
            • Multiple catch (see SimpleExceptions.java)
            • Using both parent & subclass in catch clause
            • Always catch the appropriate Exception
        • Termination vs Resumption of program control
      • Propagating the Exception (see ThrowingAndPropagating.java)
      • Exception chaining (see ExceptionChaining.java)
    • Throwing Exceptions
      • Creating and throwing an Exception
      • The throws clause
      • Choosing the Exception to throw
    • Creating Custom Exceptions (see MyException.java)
      • When do we need to create custom Exceptions
      • Extend an Exception class
          • Extend Exception
          • Extend a subclass of Exception
      • Override constructors
      • The name says it all
      • Approaches to Exception creation
          • Using a generic Exception with different messages
          • Using different Exception classes
          • Adding additional objects to the Exception
    • Exception Specification
      • Methods which throw an Exception must define them using the throws clause
      • Runtime Exceptions need not be defined using the throws clause
      • java.lang.Exception API
      • Standard Java Exceptions
      • Using Exception in overriden methods (will not allow)
    • Runtime Exceptions (see RuntimeExceptionExample.java)
      • Runtime Exceptions are special
      • Runtime Exceptions in Java
      • When to use Runtime Exceptions
    • The finally clause (see Finally.java)
      • The finally is used to perform cleanup after an Exception is thrown
      • When is finally called
      • The lost Exception
      • Finally without a catch
    • Best Practices with Exceptions
      • Do not catch an Exception if you cannot deal with it
      • Always use finally to perform clean up activities
      • Name custom Exceptions appropriately
      • Add appropriate messages to Exceptions
      • Do not throw too many Exceptions from a method
      • Use Wrappers where necessary
    • Summary
      • Exceptions are used for improved error recovery
      • Using Exceptions appropriately will result in robust programs
      • Revisit Exception API
    • Where to Get More Information
      • http://www.adaptivelearningonline.net/adaptivecourses/2006/7/28/exception-handling.html
      • Thinking In Java – chapter on “Error Handling With Exceptions”
      • http://java.sun.com/docs/books/tutorial/essential/exceptions/
      • Google: Java exception best best practices