return in Switch case

[pradeepta chopra]

class k{
public static void main(String[] args)
{
int x=1;
switch(x+2){
case 4: System.out.println("4");
        break;
 default: System.out.println("default");
        break;
case 3: System.out.println("3");
         return;
        //break;
}
System.out.println("returned");  ///line 1
}
}

When i write a return statement in the Switch case,where does the control returns to??
the line 1 is not printed

[Steven Landers]

The "return" keyword always has to do with exiting the current method (with a few peculiarities regarding the finally{} block). "break" will exit a switch statement.

In this case, "return" returns the flow to the "caller of main" which in this case, would be the JVM, I imagine.

You can test this similarly by creating another function, with a return type of "void" - with this same switch statement. If you call this new function from main(), you'll note that the return statement "returns" the flow to main - and your //line 1 is never printed.

[pradeepta chopra]

Thanks Steven Landers,ur suggestion works

[Ganeshkumar cheekati]

hi pradeepta did you run the code?

i am getting java.lang.NoClassDefFoundError at runtime....

[pradeepta chopra]

Ofcourse i have run the code.
but i dont get any Exception,check for the directory and its path where you are storing the file

[Ganeshkumar cheekati]

HI pradeepta.........

class k{
public static int main(String[] args)
{
int x=1;
switch(x+2){
case 4: System.out.println("4");
break;
default: System.out.println("default");
break;
case 3: System.out.println("3");
return ;
//break;
}
System.out.println("returned"); //line 1
}
}

i have compiled the same code which is posted by you with 1.5compiler.i am getting compilation error as:

missing return value
return ;
^

[pradeepta chopra]

hi GaneshKumar,
you probably have done a typing mistake.
make sure that it is return; //no space between return and;

[Ganeshkumar cheekati]

return;

still it is giving the same compilation error

missing return value;
return;
^

[pradeepta chopra]

thats because you have declared
public static int main()

and that requires you to return a value

[Ganeshkumar cheekati]

actually i tried your code by returning some int value so that i put int as a return type....

ok i have changed it to void and compiled

but now it is compiled and throwing runtime exception as

NoClassDefFoundError



[ November 05, 2008: Message edited by: Ganeshkumar cheekati ]

[pradeepta chopra]

i have compiled your post's code with return; and void modifications ,it compiles fine and no Exception is thrown.

[Ganeshkumar cheekati]

which compiler you are using?

what is the output?

[Ankit Garg]

ganesh just do what pradeepta is saying. Change the return type of main to void...

[Ganeshkumar cheekati]

yeah i have done that.
i am getting NoClassDefFoundError.

but she got output for the same code.

i dont know why i am getting this exception?
[ November 05, 2008: Message edited by: Ganeshkumar cheekati ]

[Amit Ghorpade]

Originally posted by Ganeshkumar cheekati:
yeah i have done that.
i am getting NoClassDefFoundError.

but she got output for the same code.

i dont know why i am getting this exception?

Firstly NoClassDefFoundError is not an exception.

Where is the compiled .class file stored on your disk?
are you executing java k.class from that same location?

[Ganeshkumar cheekati]

yeah i got it now.
output is 3.
thanks to every one who has spended their time for me...


[ November 06, 2008: Message edited by: Ganeshkumar cheekati ]