done: while (true) {
    while (true) {
        break done;
    }
}

labelOfOuterLoop: while(true) {
  while(true) {
    break labelOfOuterLoop;
  }
}

The default of "break" is to end the nearest syntactically enclosing
loop. If you want to break any other enclosing statement, you have to
point out which block to break. That is done by giving the statement a
name, using a statement label, and using that name in the break.
 
/L