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Questions and Answers
What type of inheritance is demonstrated in the example public class Bird implements Flyable, Walkable {}?
What is the purpose of the @Override annotation in method overriding?
What is the key difference between method overriding and method overloading?
What is the result of attempting to override a method in a superclass without using the @Override annotation?
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What type of inheritance is demonstrated in the example public class Dog extends Animal {}?
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What is the main advantage of using method overriding?
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What is the purpose of the extends keyword in Java inheritance?
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What type of inheritance is demonstrated in the following code: public class Dog extends Animal {}?
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What is the consequence of not supporting multiple inheritance in Java?
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What type of inheritance allows a child class to inherit properties from a parent class, which itself inherits from another parent class?
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What is the purpose of method overriding in Java?
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What is an example of hierarchical inheritance in Java?
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How can multiple inheritance be achieved in Java?
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What is the main difference between single inheritance and multilevel inheritance?
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Study Notes
Inheritance in Java
Single Inheritance
- A derived class inherits properties from a single base class.
- A child class inherits the properties and behavior of a parent class.
- Syntax:
public class Child extends Parent {}
Example:
public class Animal {
void eat() {
System.out.println("Eating...");
}
}
public class Dog extends Animal {
void bark() {
System.out.println("Barking...");
}
}
Multilevel Inheritance
- A derived class inherits properties from a base class, which itself inherits from another base class.
- A grandchild class inherits the properties and behavior of a parent and grandparent class.
- Syntax:
public class Grandchild extends Child {}andpublic class Child extends Parent {}
Example:
public class Animal {
void eat() {
System.out.println("Eating...");
}
}
public class Mammal extends Animal {
void walk() {
System.out.println("Walking...");
}
}
public class Dog extends Mammal {
void bark() {
System.out.println("Barking...");
}
}
Hierarchical Inheritance
- A single base class has multiple derived classes.
- Multiple child classes inherit the properties and behavior of a single parent class.
- Syntax:
public class Child1 extends Parent {}andpublic class Child2 extends Parent {}
Example:
public class Animal {
void eat() {
System.out.println("Eating...");
}
}
public class Dog extends Animal {
void bark() {
System.out.println("Barking...");
}
}
public class Cat extends Animal {
void meow() {
System.out.println("Meowing...");
}
}
Multiple Inheritance
- Not directly supported in Java, as it can lead to the Diamond Problem.
- Can be achieved using interfaces, which allow a class to implement multiple interfaces.
- Syntax:
public class Child implements Interface1, Interface2 {}
Example:
public interface Flyable {
void fly();
}
public interface Walkable {
void walk();
}
public class Bird implements Flyable, Walkable {
public void fly() {
System.out.println("Flying...");
}
public void walk() {
System.out.println("Walking...");
}
}
Method Overriding
- A derived class provides a specific implementation for a method already defined in its base class.
- The method in the derived class has the same name, return type, and parameter list as the method in the base class.
- Syntax:
public class Child extends Parent { @Override public void method() {} }
Example:
public class Animal {
void sound() {
System.out.println("Making a sound...");
}
}
public class Dog extends Animal {
@Override
public void sound() {
System.out.println("Barking...");
}
}
Note: The @Override annotation is used to indicate that a method is intended to override a method in the superclass.
Inheritance in Java
Single Inheritance
- A derived class inherits properties from a single base class.
- Child class inherits properties and behavior of a parent class.
- Syntax:
public class Child extends Parent {}
Multilevel Inheritance
- A derived class inherits properties from a base class, which itself inherits from another base class.
- Grandchild class inherits properties and behavior of a parent and grandparent class.
- Syntax:
public class Grandchild extends Child {}andpublic class Child extends Parent {}
Hierarchical Inheritance
- A single base class has multiple derived classes.
- Multiple child classes inherit properties and behavior of a single parent class.
- Syntax:
public class Child1 extends Parent {}andpublic class Child2 extends Parent {}
Multiple Inheritance
- Not directly supported in Java due to the Diamond Problem.
- Can be achieved using interfaces, allowing a class to implement multiple interfaces.
- Syntax:
public class Child implements Interface1, Interface2 {}
Method Overriding
- A derived class provides a specific implementation for a method already defined in its base class.
- The method in the derived class has the same name, return type, and parameter list as the method in the base class.
- Syntax:
public class Child extends Parent { @Override public void method() {} } - The
@Overrideannotation indicates that a method is intended to override a method in the superclass.
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Description
This quiz covers the concepts of single inheritance and multilevel inheritance in Java programming. Learn about how derived classes inherit properties from base classes.
