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break and label, "The label MyLabel is missing"

Tags:

java

label

break

I have a code like this:

if(condition1)
{
    break MyLabel;
}
while(true)
{
    //some code here
    MyLabel: if(condition2) break;
    //more code here
}

and I get this error:

The label MyLabel is missing.

What's wrong?

like image 772
Lrrr Avatar asked Jan 10 '12 11:01

Lrrr


2 Answers

You can only break to a label that is on a textually enclosing statement. In your example, the label is NOT on a statement that encloses the break statement.

(For what it is worth, even higher-level languages that support goto don't allow you to jump into the middle of a loop from the outside. I'm thinking of C ... and older languages like FORTRAN.)

Java allows you to break out, but breaking in is illegal ... and will get you arrested :-)

(Sorry, I couldn't resist it. For those who don't get the joke, a "break in" is when someone enters your house to steal stuff - see "break and enter" ... )

like image 118
Stephen C Avatar answered Oct 22 '22 05:10

Stephen C


You can't use labels as goto in that general way.
Use labels if you want to goto a higher level of nested code.

for example

l1: while
 l2: while
  l3: while
   break l1
   l4: while
like image 21
Farmor Avatar answered Oct 22 '22 04:10

Farmor