About Question enthuware.ocajp.i.v7.2.1057 :

[Zoryanat]

Could you please help me to understand what is correct syntax to enclose all three lines into scope of Jill label:

JACK: while (c < 8){
JILL: System.out.println(c);
if (c > 3) break JILL; else c++;
}

Many thanks!
Regards
Zoryana

[admin]

You can put it in a block like this:
JACK: while (c < 8){

JILL: {
System.out.println(c);
if (c > 3) break JILL; else c++;
}

}

[fasty23]

I used this code
void crazyLoop(){
int c = 0;
JACK: while (c < 8){
JILL: {
System.out.println(c);
if (c > 3) break JILL; else c++;
}}}
And it keep print 4 forever.
Can we use break label in this manner practical?

[coder007]

Can we put break clause inside a block of code {...} that is not within a loop-statement nor switch?

[admin]

Try it out

[coder007]

Thanks
I know that that is the best way

Well, if we use unlabeled break we can put it only inside the loops or switch statements. Otherwise it wont compile and we get a message:

Code: Select all

error: break outside switch or loop

But if we use labeled break, we can put it also inside of ordinary block of code

Code: Select all

myLabel: { //some code

if (condition)
   break myLabel;

// some code
}

And both, labeled and unlabeled continue can be used only inside the loops.

[Rick84]

I understand that you can add a label to any statement that isn't a declaration, but you can only use break in blocks and continue in loops. So am I right in saying that the JILL label in the question is comepletely useless? Or am I missing something?

Code: Select all

void crazyLoop(){
   int c = 0;
   JACK: while (c < 8){
       JILL: System.out.println(c);
       if (c > 3) break JILL; else c++;
   }
}

[admin]

Yes, it is pretty much useless.