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

994

---

How many methods are there in the serializable interface?

1000

---

How to define an interface?

1043

---

What is the abstract method modifier?

1070

---

What is meant by “abstract interface”?

1066

---

Explain the abstract class modifier?

944

---

How to define an abstract class?

1086

---

Can an interface have an inner class?

1093

---

What is the gang of four design pattern?

1156

---

When should design patterns be used?

1124

---

What are creational design patterns?

1138

---

What is a behavioral design pattern?

1094

---

what is the lazy design pattern?

1115

---

Describe the builder design pattern

1177

---

What are structural design patterns?

1196

---