Java Part-34 | Exception Handling Example (Gujarati) смотреть онлайн

Exception-Handling Fundamentals
Java exception handling is managed by via five keywords: try, catch, throw, throws, and finally
Program statements to monitor are contained within a try block
If an exception occurs within the try block, it is thrown
Code within catch block catch the exception and handle it
System generated exceptions are automatically thrown by the Java run-time system
To manually throw an exception, use the keyword throw
Any exception that is thrown out of a method must be specified as such by a throws clause

Any code that absolutely must be executed before a method returns is put in a finally block
General form of an exception-handling block
try{
// block of code to monitor for errors
}
catch (ExceptionType1 exOb){
// exception handler for ExceptionType1
}
catch (ExceptionType2 exOb){
// exception handler for ExceptionType2
}
//…
finally{
// block of code to be executed before try block ends
}
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Handling an exception has two benefits,
It allows you to fix the error
It prevents the program from automatically terminating
The catch clause should follow immediately the try block
Once an exception is thrown, program control transfer out of the try block into the catch block
Once the catch statement has executed, program control continues with the next line in the program following the entire try/catch mechanism

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