Exception Handling

Built-In Exceptions

Here application creates a method and forces it to divide by zero. The method does not have to explicitly throw an exception because the division operator throws an exception when required.

An example of a built-in exception.

import java.io.* ;
import java.lang.Exception ;
public class DivideBy0
{
public static void main( String[] args )
{
int a = 2 ;
int b = 3 ;
int c = 5 ;
int d = 0 ;
int e = 1 ;
int f = 3 ;
try
{
System.out.println( a+"/"+b+" = "+div( a, b ) ) ;
System.out.println( c+"/"+d+" = "+div( c, d ) ) ;
System.out.println( e+"/"+f+" = "+div( e, f ) ) ;
}
catch( Exception except )
{
System.out.println( "Caught exception " +
except.getMessage() ) ;
}
}
static int div( int a, int b ) {
return (a/b) ;
}
}

Output

The output of this application is shown here:

2/3 = 0
Caught exception / by zero

The first call to div() works fine. The second call fails because of the divide-by-zero error. Even though the application did not specify it, an exception was thrown--and caught.