Exceptions in Java

1. What is an exception

what is an exception

Terminal the event of normal instruction flow

errors generated by the program during operation are called exceptions.

syntactically correct error in operation

2. Classification of exceptions

The virtual opportunity generates an exception object when the program generates an exception

all of the exception classes are sub-class of Throw ble

exceptions are divided into two main categories:

ERRor: Error, which occurs when the virtual machine is running, and when an error occurs, the virtual machine shuts down directly

Exception: Exception

Exception are divided into two main categories:

run-time exception Runtimeexception(uncheck exception)

Compile-time exception (Check exception)

If check exception is likely to occur in a piece of code , then the Java compiler will force the code to be handled abnormally.

For example: ThRead.sleep (+);

3.try.How to use the catch.finally structure

try{

Put code that might have an exception

}catch (Exception e) {

e.printstacktrace ();

}finally{

regardless of whether an exception occurs, it will be executed

}

Exceptions in Java