Q 23 - Method & Constructor

[HARSHITH-MV]

Dif btw method & constructor ⁉️

[AmjustGettingStarted]

Difference Between Method and Constructor

Feature	Constructor	Method
Purpose	Used to initialize an object	Used to define behavior or functionality
Name	Same as the class name	Can be any valid identifier (usually verb/action-like)
Return Type	No return type (not even void)	Must have a return type (can be void, int, String, etc.)
Invocation	Automatically called when an object is created using new	Manually called using the object
Default Behavior	Java provides a default constructor if none is defined	Java does not provide a default method
Overloading	Can be overloaded (multiple constructors with different parameters)	Can also be overloaded
Inheritance	Not inherited by subclasses	Inherited by child classes (except private ones)
Special Keyword	Uses this() or super() for chaining	Uses this to refer to instance variables or call other methods

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🧠 Key Points to Remember

• Constructors are for object setup, methods are for object behavior.

• Constructors run once when an object is created; methods can be called multiple times.

• You cannot call a constructor like a method (obj.constructor() ❌).

• A method must declare a return type, a constructor must not.

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✅ Example

public class Car {
// Constructor
Car() {
    System.out.println("Car created!");
}

// Method
void drive() {
    System.out.println("Car is moving...");
}

public static void main(String[] args) {
    Car myCar = new Car(); // Constructor is called here
    myCar.drive();         // Method is called here
}

}

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