Getting started with Java exception handling

Getting started with Java exception handling

1. Handling Exceptions (Try-catch and try-catch-finally):

A) Try throws many types of exceptions-processing of multiple catch blocks

eg:try{

Some ways to throw an exception

}catch (Exception e) {

The code block that handles the exception

}catch (Exception2 e) {

code block for handling Exception2

}.. (n catch blocks): {

}finally{

The code that will eventually execute

}

Note: Order problems-according to the order of subclasses stepfather classes from small to large

E.g:inputmismatchexception, ArithmeticException, Exception

2.return in try-catch-finally:

1, regardless of the occurrence of wood anomalies, finally block code will be executed;

2, when there is return in the try and catch, finally will still execute;

3, finally is executed after the return of the expression after the operation (at this time does not return the value of the operation, but first to save the value to return, the pipe finally in the code, the return value will not change, still is the value of the previous saved), So the function return value is determined before the finally execution;

4, finally, it is best not to include return, or the program will exit early, the return value is not a try or catch in the saved return value.

Getting started with Java exception handling