Interface

title: Interface in Java description: Java interface ka concept aur uses

Interface ek fully abstract blueprint hai. Sirf method signatures define karta hai (Java 8 se default/static methods bhi).

Syntax

java exampleWoHoTech

interface Drawable {
    // implicitly public static final
    double PI = 3.14159;

    // implicitly public abstract
    void draw();
    double area();
}

Implement karna

java exampleWoHoTech

class Circle implements Drawable {
    double radius;

    Circle(double radius) { this.radius = radius; }

    @Override
    public void draw() { System.out.println("Circle draw ho rahi hai"); }

    @Override
    public double area() { return PI * radius * radius; }
}

Multiple Interfaces

java exampleWoHoTech

interface Flyable { void fly(); }
interface Swimmable { void swim(); }

class Duck implements Flyable, Swimmable {
    public void fly() { System.out.println("Duck ud rahi hai"); }
    public void swim() { System.out.println("Duck tayr rahi hai"); }
}

Java 8+ Interface Features

java exampleWoHoTech

interface Vehicle {
    void start();

    // Default method — override optional
    default void stop() {
        System.out.println("Vehicle ruk gaya");
    }

    // Static method
    static Vehicle create() {
        return new Car();
    }
}

Interface Inheritance

java exampleWoHoTech

interface A { void methodA(); }
interface B extends A { void methodB(); }

class C implements B {
    public void methodA() { }
    public void methodB() { }
}

Abstract Class vs Interface

	Abstract Class	Interface
--	--	--
Variables	Any	public static final
Constructor	Yes	No
Multiple inherit	No	Yes
Methods	Abstract + Concrete	Abstract + default/static
Use	IS-A	CAN-DO

title: Interface in Java description: Java interface ka concept aur uses

Interface ek fully abstract blueprint hai. Sirf method signatures define karta hai (Java 8 se default/static methods bhi).

Syntax

java exampleWoHoTech

interface Drawable {
    // implicitly public static final
    double PI = 3.14159;

    // implicitly public abstract
    void draw();
    double area();
}

Implement karna

java exampleWoHoTech

class Circle implements Drawable {
    double radius;

    Circle(double radius) { this.radius = radius; }

    @Override
    public void draw() { System.out.println("Circle draw ho rahi hai"); }

    @Override
    public double area() { return PI * radius * radius; }
}

Multiple Interfaces

java exampleWoHoTech

interface Flyable { void fly(); }
interface Swimmable { void swim(); }

class Duck implements Flyable, Swimmable {
    public void fly() { System.out.println("Duck ud rahi hai"); }
    public void swim() { System.out.println("Duck tayr rahi hai"); }
}

Java 8+ Interface Features

java exampleWoHoTech

interface Vehicle {
    void start();

    // Default method — override optional
    default void stop() {
        System.out.println("Vehicle ruk gaya");
    }

    // Static method
    static Vehicle create() {
        return new Car();
    }
}

Interface Inheritance

java exampleWoHoTech

interface A { void methodA(); }
interface B extends A { void methodB(); }

class C implements B {
    public void methodA() { }
    public void methodB() { }
}

Abstract Class vs Interface

	Abstract Class	Interface
--	--	--
Variables	Any	public static final
Constructor	Yes	No
Multiple inherit	No	Yes
Methods	Abstract + Concrete	Abstract + default/static
Use	IS-A	CAN-DO

Interface

Syntax

Implement karna

Multiple Interfaces

Java 8+ Interface Features

Interface Inheritance

Abstract Class vs Interface

Continue learning this concept

Interface

Syntax

Implement karna

Multiple Interfaces

Java 8+ Interface Features

Interface Inheritance

Abstract Class vs Interface

Continue learning this concept