If this exception is thrown in the function content, the function does not need to be declared, the caller does not need to handle it, and the compilation is the same (of course, it can also be declared and processed ). You do not need to declare the function because the caller does not need to process it. When this exception occurs, you want the program to stop. Because the operation cannot be continued during running, you want to modify the code after stopping the program.
If a custom exception occurs, the operation cannot continue,
Let the custom exception inherit runtimeexception.
There are two types of exceptions:
1. Exceptions detected during compilation.
Function content throw, function throw, callers throw or capture.
2. Exceptions not detected during compilation (runtime exceptions. Runtimeexception and its subclass)
You can simply throw the function content.
Class fushuexception extends runtimeexception
{
Fushuexception (string MSG)
{
Super (MSG );
}
}
Class demo
{
Int Div (int A, Int, B)
If (B <0)
Throw new fushuexception ("the divisor is negative ");
}
Class exceptiondemo4
{
Public static void main (string [] ARGs)
{
Demo d = new demo ();
Int x = div (4,-1 );
System. Out. println ("x =" + x );
System. Out. println ("over ");
}
}
