Q 06 - Constructor

[HARSHITH-MV]

Explain in detail constructor and it's types?

[AmjustGettingStarted]

🏗️ Constructors in Java

A constructor in Java is a special method that is called when an object is instantiated. Its main purpose is to initialize the object’s state (i.e., set values to variables). It does not have a return type, not even void, and its name must match the class name.

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🔹 Key Features of Constructors

• Automatically called when an object is created.
• Can be overloaded (multiple constructors in the same class with different parameters).
• Cannot be abstract, final, static, or synchronized.
• If no constructor is defined, Java provides a default constructor implicitly.

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🔸 Types of Constructors in Java

1. Default Constructor

• A constructor without parameters.
• Provided implicitly if no other constructors are defined.

class Car {
    Car() {
        System.out.println("Default constructor called");
    }
}

2. Parameterized Constructor

• Accepts parameters to initialize objects with custom values.

class Car {
    String brand;
    Car(String b) {
        brand = b;
    }
}

3. Copy Constructor

• Used to create a new object by copying values from another object.
• Java doesn't create this automatically (like C++); it's user-defined.

class Car {
    String brand;
    Car(Car c) {
        this.brand = c.brand;
    }
}

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