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

931

---

How many methods are there in the serializable interface?

945

---

How to define an interface?

992

---

What is the abstract method modifier?

1012

---

What is meant by “abstract interface”?

1022

---

Explain the abstract class modifier?

873

---

How to define an abstract class?

1017

---

Can an interface have an inner class?

1033

---

What is the gang of four design pattern?

1085

---

When should design patterns be used?

1072

---

What are creational design patterns?

1083

---

What is a behavioral design pattern?

1039

---

what is the lazy design pattern?

1045

---

Describe the builder design pattern

1126

---

What are structural design patterns?

1134

---