Java Constructors

A constructor is also a method. But this is a special method. The constructor method is called when the object is initialized. It can be used for initialized the objects attributes.


Constructor can be non parameterized and also can be parameterized. Now let's see some examples of non-parameterized and parameterized constructors.

non-parameterized constructors

class Cars{

    public String car_name;

    // Constructor non parameterized
    public Cars() {
        this.car_name = "BMW";
    }

}

parameterized constructors

class Cars{

    public String car_name;

    // Constructor  parameterized
    public Cars(String car_name) {
        this.car_name = car_name;
    }
}

Also We can use constructor overloading like method overloading.

class Cars{

    public String car_name;

    // Constructor  parameterized
    public Cars(String car_name) {
        this.car_name = car_name;
    }

    public Cars() {
        this.car_name = "Unknown";
    }
}