how can we go out from 4 inner for loops?

Question

Hi I am beginner in java and my program has 4 for loops: my program works like this that if b is true ,the element will be removed from pointList and n will be n-- and the I want to go out from all for loops and come again from the first for loop so l will be l++,how can i do this ? with break statement?

for (int l = 0; l < n; l++) {
  for (int i = 1; i < (n - 2); i++) {
      for (int j = i + 1; j < (n - 1); j++) {
          for (int k = j + 1; k < n; k++) {
              if (l != i && l != j && l != k) {
                  boolean b = isOK(pointList.get(l), pointList.get(i), pointList.get(j), pointList.get(k));
                  System.out.println(b);
                  if (b == true) {
                      pointList.remove(pointList.get(l);
                      n--;
                      break;
                  }
                  else
                      System.out.println(b);
              }
           }
       }
    }
}

Answer 1

You can make use of a labeled break as:

      for (int l = 0; l < n; l++) {
 foo:    for (int i = 1; i < (n - 2); i++) {
            for (int j = i + 1; j < (n - 1); j++) {
                for (int k = j + 1; k < n; k++) {
                    if (l != i && l != j && l != k) {
                        boolean b = isOK(pointList.get(l), pointList.get(i), pointList.get(j), pointList.get(k));
                        System.out.println(b);
                        if (b == true) {
                            pointList.remove(pointList.get(l);
                            n--;
                            break foo;
                        }
                        else
                            System.out.println(b);
                    }

                }

            }
        }
    }

Answer 2

In a loop the break statement terminates the inner loop while continue skips to the next iteration. In order for these two statements to work on a different loop to the inner one you need to use labels. Something like this should work:

outerloop:      
        for (int l = 0; l < n; l++) {
            for (int i = 1; i < (n - 2); i++) {
                for (int j = i + 1; j < (n - 1); j++) {
                    for (int k = j + 1; k < n; k++) {
                        if (l != i && l != j && l != k) {
                            boolean b = isOK(pointList.get(l), pointList.get(i), pointList.get(j), pointList.get(k));
                            System.out.println(b);
                            if (b == true) {
                                pointList.remove(pointList.get(l);
                                n--;
                                continue outerloop;
                            }
                            else
                                System.out.println(b);
                        }

                    }

                }
            }
        }