built-in exceptions, creating own exceptions in OOP | EP=28 3rd SEM CS8392 | Quick Through |tamil
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OBJECT ORIENTED PROGRAMMINGUNIT III
EXCEPTION HANDLING AND I/O
3.3 built-in exceptions, creating own exceptions
OBJECT ORIENTED PROGRAMMINGUNIT III EXCEPTION HANDLING AND I/O3.3 built-in exceptions, creating own exceptions
2UNIT III EXCEPTION HANDLING AND I/O●Exceptions -exception hierarchy ●-throwing and catching exceptions ●–built-in exceptions, creating own exceptions, Stack Trace Elements. ●Input / Output Basics –Streams –Byte streams and Character streams ●–Reading and Writing Console –Reading and Writing Files
3Categories of Exceptions●1.Checked exceptions−A checked exception is an exception that occurs at the compile time, these are also called as compile time exceptions .These exceptions can not simply be ignored at the time of compilation, the programmer should take care of (handle) these exceptions.●2.Unchecked exceptions −An unchecked exception is an exception that occurs at the time of execution. These are also called as Runtime Exceptions. These include programming bugs, such as logic errors or improper use of an API . Run time exceptions are ignored at the time of compilation.
4Java’s Built-in Exceptions●1) Scenario where ArithmeticException occurs If we divide any number by zero, there occurs an ArithmeticException.int a=50/0;//ArithmeticException●2) Scenario where NullPointerException occurs If we have null value in any variable, performing any operation by the variable occurs an NullPointerException.●3) Scenario where ArrayIndexOutOfBoundsException occurs If you are inserting any value in the wrong index , it would result ArrayIndexOutOfBoundsException as shown:int a[]=new int[5];
5User-defined Exceptions●All exceptions must be a child of Throwable .●If we want to write a checked exception that is automatically enforced by the Handle ,we need to extend the Exception class.●User defined exception needs to inherit (extends) Exception class in order to act as an exception.●throw keyword is used to throw such exceptions.
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