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

542

---

How many methods are there in the serializable interface?

555

---

How to define an interface?

593

---

What is the abstract method modifier?

603

---

What is meant by “abstract interface”?

615

---

Explain the abstract class modifier?

495

---

How to define an abstract class?

607

---

Can an interface have an inner class?

623

---

What is the gang of four design pattern?

626

---

When should design patterns be used?

603

---

What are creational design patterns?

644

---

What is a behavioral design pattern?

638

---

what is the lazy design pattern?

624

---

Describe the builder design pattern

686

---

What are structural design patterns?

615

---