Avoid jumbled loop incrementers - it's usually a mistake, and it's confusing even if it's what's intended.
Example :
public class JumbledIncrementerRule1 {
  public void foo() {
   for (int i = 0; i < 10; i++) {
    for (int k = 0; k < 20; i++) {
     System.out.println("Hello");
    }
   }
  }
}