Exception Handling computer science concept java

Exception Handling computer science concept java

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  WELCOME TO PRESENTATION
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  Exception Handling
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  Exception Handling… • Whatis Exception? “ An Exception is an unwanted /unexpected/abnormal Situation which occurs during the execution of program i.e. at run time, that disrupts the normal flow of the program’s instruction”.
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  Exception Handling… “ ExceptionHandling is a mechanism to handle Run Time Errors”. or “The Exception Handling in Java is one of the powerful mechanism to handle the runtime errors so that normal flow of the application can be maintained”. Advantage: • Maintain the normal flow of the program
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  Exception Handling… 5Keywords Usedfor Exception Handling • Try • Catch • Finally • throw • throws
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  Exception Handling… try block •What is try block? “ whenever we write a statement and if that statement is error suspecting or code is risky then we put that code/statement inside the try block”. “ try is a block that contains only risky code”.
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  Exception Handling… Catch : •What is catch block? “ The main purpose of the catch is to handle the exception which are throws by try block”. “It is used to handle the exception”. Note: catch block will not be executed if there is no exception inside the block.
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  8 Exception Handling… • JavaException Keywords
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  Exception Handling… Finally: • Whatis finally block? “ finally block is a Realtime block and the main purpose of this finally block is to handle the resource”. “ It is always executed whether exception is caused or not”.
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  Flow chat forFinally Start Excep tion Ignore the rest code of try block Execute catch block END Ignore catch block Finally yes No
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  11 Exception Handling… • JavaException Keywords
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  Exception Handling… throw What isthrow block? “ throw keyword is used to throw the user defined or customized exception object to the JVM explicitly”.
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  Exception Handling… throws • Whatis throws ? “ throws keyword is used when we doesn’t want to handle the exception and try to send the exception to the JVM.
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  14 Exception Handling… • JavaException Keywords
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  15 Exception Handling… Types ofJava Exceptions There are mainly two types of exceptions: checked and unchecked. Here, an error is considered as the unchecked exception. there are three types of exceptions: 1. Checked Exception 2. Unchecked Exception 3. Error
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  Types of Exceptions: checkedExceptions: Compile time exception Unchecked Exceptions: Run Time Exceptions Run Time Exceptions are:- 1. Arithmetic Exceptions 2. Number Format Exceptions 3. Array Index Out of Bounds Exception 4. Null Point Exceptions
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  17 Exception Handling… • JavaException Keywords
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  18 Exception Handling… • JavaException Keywords
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  Difference between Exception& Error Exception Error Exception is caused by our program Exceptions are recoverable Exceptions are classified as checked and unchecked type Exceptions are not caused by our program Errors are not recoverable Errors are only unchecked type in java
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  Thank you