Dan's q

[Robbie kyodo]

Below is taken from Dan's qns. m1() compile error and complain that it did not catch ColorException, I like to know what is the rule that we must adhere here ?
void m1() throws ColorException
{
throw new ColorException();
}
void m2() throws WhiteException
{
throw new WhiteException();
}
public static void main (String[] args) {
White white = new White();
int a,b,d,f;
a = b = d = f = 0;
try
{white.m1();
a++;}
catch (WhiteException e)
{b++;}
try
{
white.m2();
d++;
}
catch (WhiteException e)
{f++;}
System.out.print(a+","+b+","+d+","+f);
}
}

[Jose Botella]

Rule: It is necessary to throw those checked exceptions (or subtypes) that are catched.
Exception: the rule does not apply to Exception.

class Test
{
        public static void main(String xyz[])
        {
                try { }
                catch(Exception e) { }
                try { }
                catch(RuntimeException e) { }
                try { throw new java.io.FileNotFoundException();}
                catch(java.io.IOException e) { }
                try { }
                catch(java.io.IOException e) { }//compiler error
        }
}