vault backup: 2025-03-16 18:59:42

Data Structures/GPT Answers to Past Paper/Question 4.md

@@ -1,8 +1,8 @@
-# What is an interface in object-oriented programming and how does it differ from a class?
+# What is an Interface in Object-oriented Programming and how Does it Differ from a Class?
 
-### **What is an Interface in Object-Oriented Programming?**
+### **What Is an Interface in Object-Oriented Programming?**
 
-An **interface** is a contract in object-oriented programming (OOP) that defines a set of methods (and sometimes properties) that a class must implement. It specifies _what_ a class should do, but not _how_ it should do it.
+An **interface** is a contract in object-oriented programming (OOP) that defines a set of methods (and sometimes properties) that a class must implement. It specifies *what* a class should do, but not *how* it should do it.
 
 Key characteristics of an interface:
 
@@ -12,6 +12,7 @@ Key characteristics of an interface:
 4. **No State**: Interfaces do not contain instance variables or state but may include constants.
 
 #### Example in Java:
+
 ```java
 // Define an interface
 public interface Animal {
@@ -33,7 +34,7 @@ public class Dog implements Animal {
 }
 ```
 
-### **What is a Class?**
+### **What Is a Class?**
 
 A **class** is a blueprint for creating objects in OOP. It defines the structure (fields or attributes) and behavior (methods) of objects. Unlike interfaces, classes can have implementations, state, and behavior.
 
@@ -45,6 +46,7 @@ Key characteristics of a class:
 4. **Constructors**: Classes can have constructors to initialize objects.
 
 #### Example in Java:
+
 ```java
 // Define a class
 public class Dog {
@@ -73,13 +75,14 @@ public class Dog {
 |**Constructors**|Cannot have constructors.|Can have constructors to initialize objects.|
 |**Abstract**|Interfaces are entirely abstract (unless extended in modern versions).|Can be abstract or concrete.|
 |**Default Methods**|Starting from Java 8, interfaces can have default methods (methods with a body).|Classes always support method implementation.|
-### **When to Use an Interface?**
+
+### **When To Use an Interface?**
 
 - **Polymorphism**: When you want different classes to provide their specific implementation of the same behavior.
 - **Decoupling**: To decouple code by relying on abstractions rather than concrete classes.
 - **Multiple Inheritance**: When you need a class to inherit behavior from multiple sources.
 
-### **When to Use a Class?**
+### **When To Use a Class?**
 
 - When you need to define an object with both state and behavior.
 - When you need concrete implementations of methods.