Java extra method?

[fallow parrot]

Hey, so my teacher sent us some code and I'm trying to understand it but at the end there is something that I would say is extra (shouldn't be there) as it has nothing inside it. Does it have a purpose or maybe it's a typo from teacher? Its the last "public Contacto()" that is empty

[hot abyss]

<@&987246399047479336> please have a look, thanks.

[hot abyss]

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[fallow parrot]

`public Contacto(String nombre, String telefono) {
this.nombre = nombre;
this.telefono = telefono;
}

**public Contacto() {**
**}**

}`

...

the last part

[timber bear]

is 'Contacto' a class ?

[plucky scroll]

by default, if you don't define any constructors, all classes get a no-arg constructor
but if you define at least one, no new constructors are generated
so if you want to bring back the no-arg constructor, you have to define it manually

[fallow parrot]

yes

[fallow parrot]

i didnt understand that part

[fallow parrot]

Contacto is a class

this is the entire thing

[plucky scroll]

could you be more clear what needs to be addressed

[hot abyss]

I uploaded your attachments as gist. That way, they are easier to read for everyone, especially mobile users 👍

[fallow parrot]

I want to know what is the purpose of the last 5 lines of code

I already have the toString defined

[plucky scroll]

you mean the two constructors?

[fallow parrot]

so the "public Contacto(..." makes no sense to me

[fallow parrot]

the last two methods

[plucky scroll]

do you know what a constructor is

maybe you have lectures on that topic

[fallow parrot]

that

bhut there is another one

or what looks to be another one?

in the code I sent

[plucky scroll]

do you know what they are used for

[fallow parrot]

to give the object the parameters I gave it right?

[plucky scroll]

when is the constructor called?

[fallow parrot]

when you need to "build" the object like with params so if I have public Character(String name, String weapon, String class) for example

right?

[plucky scroll]

it's called when you create an object using new

new Contacto(...)

if you only define a constructor with 2 arguments, then you must pass 2 arguments to your call to new

if you define no constructors, you get a default one with no arguments
but if you define at least one, that one is gone and needs to be enabled manually

therefore, it's added to the code

[fallow parrot]

So why do I have 2 constructors?

In the code I sent

[sturdy spear]

each constructor defines a way that u can make an object

u got one that has a name and telephonenumber, and one that has no data

[fallow parrot]

ah, so in my case, i can make an object with 2 parameters or with none

[sturdy spear]

yes

[fallow parrot]

now I get it

thx

For the constructor to properly work you need to first define methods for the arguments right?

[sturdy spear]

yes / no. Your answer is a bit dubious due to miss use of terminology. Inside the constructor u can have stuff happening, or u can ( as u say ) use methods to do things, like setters and alike

[timber bear]

if the example says that u should put 2 values , then you get the constructor with 2 parametres that you created , otherwise takes the constructor without parametres ( default constructor) .Hope i was clear 🙂

@fallow parrot

[fallow parrot]

yu thanks :D

I put in both just to be safe haha

but Im happy I was able to understand why

[timber bear]

good 😄