how to jump from one for loop to another for loop using label in java?

Question

when i am trying to access for loop from another loop i get following errors. how can i do that can somebody explain.

public class Test {
   public static void main(String...rDX) {
      runing:
      for (int i = 1; i < 10; i++)
         System.out.print(i);
      for(int i = 1; i < 10; i++) {
         if (i == 5) {
            continue runing;
         }
      }
   }
}

error: java:28: error: undefined label: runing continue runing; ^ 1 error

Answer 1

You can't do that because you can only abort a chain of nested fors and continue on some outer / parent for. You can't continue with other fors that happen to be simply nearby. But you could use that to do e.g.

public class Test {
    public static void main(String...rDX) {
        runing: for (;;) { // infinite loop
            for (int i = 1; i < 10; i++)
                System.out.print(i);
            for(int i = 1; i < 10; i++) {
                if (i == 5) {
                    continue runing;
                }
            }
            break; // = break runing; effectively never reached
                   // because above "continue" will always happen
        }
    }
}

This has the desired(?) effect since it continues with the newly added outer loop which goes back the the first loop.

(?) = at least what it would do when it would compile - I doubt you actually want that because you'll still print 1..10, then in the next step invisibly count to 5 and do nothing with that number.