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

533

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How many methods are there in the serializable interface?

551

---

How to define an interface?

586

---

What is the abstract method modifier?

591

---

What is meant by “abstract interface”?

612

---

Explain the abstract class modifier?

487

---

How to define an abstract class?

600

---

Can an interface have an inner class?

614

---

What is the gang of four design pattern?

614

---

When should design patterns be used?

591

---

What are creational design patterns?

636

---

What is a behavioral design pattern?

629

---

what is the lazy design pattern?

609

---

Describe the builder design pattern

673

---

What are structural design patterns?

607

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