Reports loops that can be safely replaced with the foreach syntax. The rule considers loops over lists, arrays and iterators. A loop is safe to replace if it only uses the index variable to access an element of the list or array, only has one update statement, and loops through every element of the list or array left to right.

public class MyClass {
  void loop(List l) {
    for (int i = 0; i < l.size(); i++) { // pre Java 1.5
      System.out.println(l.get(i));
    }

    for (String s : l) {        // post Java 1.5
      System.out.println(s);
    }
  }
}