Exceptions Overview An exception is an object that defines an unusual or erroneous situation Examples Divide by 0 Array index out of bounds File cannot be found Follow a null reference Uncaught Exceptions int a 5 int b 0 int c a b Exception in thread main java lang ArithmeticException by zero at ExceptionsExamples main ExceptionsExamples java 12 Uncaught Exceptions Call stack trace info about where the exception occurred info about all methods that were called to get to the method where the exception occurred Exception in thread main java lang ArithmeticException by zero at ExceptionsExamples caller2 ExceptionsExamples java 20 at ExceptionsExamples caller1 ExceptionsExamples java 12 at ExceptionsExamples main ExceptionsExamples java 8 try catch try statements that may throw an exception catch Exception Type name what to do in case of exception Exception Type catch Another Type another name what to do in case of exception Another Type Propagation void divider throws ArithmeticException int a 5 int b 0 int c a b Exception Class Hierarchy Throwable Error Exception IOException EOFException FileNotFoundException ClassNotFoundException RuntimeException ArithmeticException ClassCastException NullPointerException Designing Throwing Own Exception Create a class that extends Exception OutOfRangeException if out of range throw new OutOfRangeException message
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