Logging an Exception in Java
This section introduces you the concept of logging
exception handling. When certain conditions are not followed or wrong then
compiler shows a message which is mentioned under the specific exception. Exception is an event that occurred
when the program is execute or in running time. This is used for the error
handling. There are several errors are caught by different specific exceptions like the
"divided by zero" error is under the ArithmeticException, blank array is
under the NullPointerException, blank stack is a
EmptyStackException and many others errors are handled by many exceptions like
that.
Description of program:
This program represents two exceptions like: ArithmeticException and
NullPointerException by Logger object. Program contains two method DivByZero() method
and ArrayBound() method which provides an exception at the running time of
program. The DivByZero method throws ArithmethicException because '1' is not
divisible by '0' and another method gives the working illustration of NullPointerException
that catch the error when the array is
blank.
Description of code:
log(Level level, String message, Throwable thrown):
Above method shows a log message generated by Throwable information
to the system. It takes level provided by logger and also a string type value
with given message and throwable information at the time of running.
Here is the code of program:
import java.io.*;
import java.util.logging.*;
public class LogException{
public static void main(String[] args) {
LogException l = new LogException();
}
public void DivByZero() {
System.out.println(1/0);
}
int arr[];
public void ArrayBound() {
System.out.println(arr[0]);
}
public LogException(){
Logger log = Logger.getLogger("");
try{
DivByZero();
}
catch (Exception e){
log.log(Level.WARNING, "Can not divede by zero", e.getMessage());
}
try{
ArrayBound();
}
catch(Exception ex){
log.log(Level.INFO, "Array is blank", ex.getMessage());
}
}
}
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