Create object without ‘new’ keyword

Class ref = Class.forName("DemoClass");
DemoClass obj = (DemoClass) ref.newInstance();

instance.getClass().getClassLoader().loadClass("NewClass").newInstance();

Detect infinite loop in LinkedList

public boolean doesLoopExist(SinglyLinkedList listToCheck) {
    SinglyLinkedList.Node tortoise = listToCheck.getStart();
    SinglyLinkedList.Node hare = listToCheck.getStart();
 
    try {
      while (true) {
        tortoise = tortoise.getNext();
        hare = hare.getNext().getNext();
        if (tortoise == hare) {
          return true;
        }
      }
    } catch (NullPointerException ne) {
      return false;
    }
  }