can any one please clarify about how this is different

Question about the task

Constructor

Java Syntax, Level 5, Lesson 9

Resolved

public void Circle(){ ....... } public Circle(){ ....... } what effects when we used void . i know void means null.

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Daniel

Level 9 , Vienna, Austria

15 May 2020, 19:17

Constructors don't have a return type.

Mike Taylor

Level 13 , Auckland, New Zealand

20 February 2020, 03:08

This first one defines a method - "()" no parameters being passed into method, "void" not returning any value. The second one is only used by program if creating a Circle object, that form is specifically a constructor.

Ashish RajAnand

Level 13 , Bhilai , India

20 February 2020, 04:01

thanks a lot ,I know that bro . if we create object of circle then

public class Car {

    String model;
    int maxSpeed;

    public void Car() {
        this.model = "BMW";
        this.maxSpeed = 1000;
    }

    public static void main(String[] args) {
        Car bugatti = new Car();
    }

}

is there any error ?

Mike Taylor

Level 13 , Auckland, New Zealand

20 February 2020, 04:33

Definitely ran this myself to be sure, and found it functioned not as desired. When line 12 runs it looks for constructor "public Car()" but can't find it, so the info "BMW" and "1000" are not assigned to it. So if we call bugatti.model or bugatti.maxSpeed, they are both null; If you add a line (say line 13) "bugatti.Car(), that is call the method, then your values will get assigned and can now be referenced. So your code above compiles but won't work as effectively as it should.

Ashish RajAnand

Level 13 , Bhilai , India

20 February 2020, 07:02

thanks bro