A runtime exception is throws in the catch clause:

[Thomas Markl]

I don’t understand this:
Both programs throw the Runtime-Exception „ArithmeticException“ in the catch clause.
But in Test81 the „finally“ clause prevents the ArithmeticException
From beeing thrown to the System level.
What happens?

class Test81 {
static String raid ( ) {
try
{
throw new Exception ( ) ;
}
catch ( Exception e )
{ 
                        int i = 1 / 0 ; 
                          //should throw unchecked ArithmeticException
return " Error " ;
}
finally
{
return " Peace " ;
}
}
public static void main ( String args [ ] ) {
System . out . println ( raid ( ) ) ;
}
}

Result:
C:\Java\EigeneJavaProgramme>java Test81
Peace

Why does it throw Arithmetic Exception NOW?

class Test81a {
static String raid ( ) {
try
{
throw new Exception ( ) ;
}
catch ( Exception e )
{ 
                        int i = 1 / 0 ; 
                          //should throw unchecked ArithmeticException
return " Error " ;
}
//finally
//{
//return " Peace " ;
//}
}
public static void main ( String args [ ] ) {
System . out . println ( raid ( ) ) ;
}
}

C:\Java\EigeneJavaProgramme>java Test81a
java.lang.ArithmeticException: / by zero
at Test81.raid(Test81a.java:11)
at Test81.main(Test81a.java:22)
Exception in thread "main"

[Sam Zou]

Hi,
In fact the ArithmeticException is thrown in both case. To see it, put a try catch statement at the place where you make your zero division.

 
class Test81b {
    static String raid ( ) {
        try{
            throw new Exception ( ) ;
        }catch ( Exception e ){
            try{
                int i = 1 / 0 ;
            }catch(ArithmeticException e1){
                System.out.println("ArithmeticException");
                return "ArithmeticException";
            }
            //should throw unchecked ArithmeticException
            return " Error " ;
        }finally{
            return " Peace " ;
        }
    }
    public static void main ( String args [ ] ) {
        System . out . println ( raid ( )+" MAIN" ) ;
    }
}
 

The ouput give :
E:\Dev\src\Test>java Test81
ArithmeticException
Peace MAIN
In your Test81 class, the ArithmeticEception doesn't come up because it is not catched by any catch statement.
The finally clause is always executed no matter what happened in the catch clause.
But I don't known why in Test81 the program don't stop to notice the ArithmeticException.
Waltereo

[Jim Yingst]

In Test81, the return statement inside the finally {} essentially tells the JVM to forget about the exception that it was throwing, and just return "Peace" instead. This is why it's almost always a bad idea to do a return inside a finally. Also if any new exception were thrown inside the finally, only the new exception would be thrown - the old one would be forgotten. This may seem strange, but what other behavior would make more sense? It's not possible to throw two exceptions, or to throw one exception and also return a value - so the language designers decided to make the JVM do whatever the finally clause says, inpreference to what would have happened otherwise.