Is iterator a class or interface? What is its use?

891

---

How many methods are there in the serializable interface?

909

---

How to define an interface?

946

---

What is the abstract method modifier?

966

---

What is meant by “abstract interface”?

974

---

Explain the abstract class modifier?

831

---

How to define an abstract class?

964

---

Can an interface have an inner class?

983

---

What is the gang of four design pattern?

1033

---

When should design patterns be used?

1021

---

What are creational design patterns?

1026

---

What is a behavioral design pattern?

994

---

what is the lazy design pattern?

1003

---

Describe the builder design pattern

1070

---

What are structural design patterns?

1095

---