Inheritance

title: Inheritance in Java description: Java mein inheritance ka concept aur types

Parent class ki properties aur methods child class mein inherit karna. extends keyword use hota hai.

Basic Example

java exampleWoHoTech

class Animal {
    String name;
    void eat() { System.out.println(name + " kha raha hai"); }
    void sleep() { System.out.println(name + " so raha hai"); }
}

class Dog extends Animal {
    void bark() { System.out.println("Bhow Bhow!"); }
}

Dog d = new Dog();
d.name = "Tommy";
d.eat();   // Parent method
d.bark();  // Own method

Types of Inheritance in Java

Single Inheritance

java exampleWoHoTech

class A { }
class B extends A { }

Multi-level Inheritance

java exampleWoHoTech

class A { }
class B extends A { }
class C extends B { }  // C → B → A

Hierarchical Inheritance

java exampleWoHoTech

class A { }
class B extends A { }
class C extends A { }  // B aur C dono A se

Multiple Inheritance — NOT Supported

Java mein class multiple classes extend nahi kar sakti (Diamond problem).

java exampleWoHoTech

// NOT VALID in Java
class C extends A, B { } // Error!
// Interface se multiple inheritance possible hai

IS-A Relationship

Inheritance IS-A relationship represent karta hai.

Dog IS-A Animal ✓
Car IS-A Vehicle ✓

Method Overriding

java exampleWoHoTech

class Animal {
    void sound() { System.out.println("..."); }
}
class Cat extends Animal {
    @Override
    void sound() { System.out.println("Meow"); }
}

instanceof Operator

java exampleWoHoTech

Dog d = new Dog();
System.out.println(d instanceof Dog);    // true
System.out.println(d instanceof Animal); // true

title: Inheritance in Java description: Java mein inheritance ka concept aur types

Parent class ki properties aur methods child class mein inherit karna. extends keyword use hota hai.

Basic Example

java exampleWoHoTech

class Animal {
    String name;
    void eat() { System.out.println(name + " kha raha hai"); }
    void sleep() { System.out.println(name + " so raha hai"); }
}

class Dog extends Animal {
    void bark() { System.out.println("Bhow Bhow!"); }
}

Dog d = new Dog();
d.name = "Tommy";
d.eat();   // Parent method
d.bark();  // Own method

Types of Inheritance in Java

Single Inheritance

java exampleWoHoTech

class A { }
class B extends A { }

Multi-level Inheritance

java exampleWoHoTech

class A { }
class B extends A { }
class C extends B { }  // C → B → A

Hierarchical Inheritance

java exampleWoHoTech

class A { }
class B extends A { }
class C extends A { }  // B aur C dono A se

Multiple Inheritance — NOT Supported

Java mein class multiple classes extend nahi kar sakti (Diamond problem).

java exampleWoHoTech

// NOT VALID in Java
class C extends A, B { } // Error!
// Interface se multiple inheritance possible hai

IS-A Relationship

Inheritance IS-A relationship represent karta hai.

Dog IS-A Animal ✓
Car IS-A Vehicle ✓

Method Overriding

java exampleWoHoTech

class Animal {
    void sound() { System.out.println("..."); }
}
class Cat extends Animal {
    @Override
    void sound() { System.out.println("Meow"); }
}

instanceof Operator

java exampleWoHoTech

Dog d = new Dog();
System.out.println(d instanceof Dog);    // true
System.out.println(d instanceof Animal); // true

Inheritance

Basic Example

Types of Inheritance in Java

Single Inheritance

Multi-level Inheritance

Hierarchical Inheritance

Multiple Inheritance — NOT Supported

IS-A Relationship

Method Overriding

instanceof Operator

Continue learning this concept

Inheritance

Basic Example

Types of Inheritance in Java

Single Inheritance

Multi-level Inheritance

Hierarchical Inheritance

Multiple Inheritance — NOT Supported

IS-A Relationship

Method Overriding

instanceof Operator

Continue learning this concept