I can't find the solution to my problem

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I'm trying to use the get and set with the toString but isn't working and I don't know why.
Can someone try to just explaing without saying the answer.

thanks on advance

What I have tried:

public class Main extends Livro{

    public static void main ( String Args[] ){

        Livro l1 = new Livro();
        l1.setTitulo("Harry Potter e a Pedra Filosofal");
        l1.setIsbn(978972232);
        l1.setAutor("J. K. Rowling");
        l1.setPaginas(260);

        Livro l2 = new Livro();
        l2.setTitulo("Harry Potter e a Pedra Filosofal");
        l2.setIsbn(978972232);
        l2.setAutor("J. K. Rowling");
        l2.setPaginas(260);

        System.out.println(l1.toString());
    }
    public String toString(){

        return "O livro com título " + getTitulo() + " e " + getIsbn() + " e autor " + getAutor() + " tem " + getPaginas() + "páginas";
        
    }

Posted 20-Jul-22 4:06am

Antonio_Rodrigues

Updated 20-Jul-22 9:53am

Dave Kreskowiak

v2

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Richard MacCutchan 20-Jul-22 10:42am

That is Java code, not Javascript.

2 solutions

Solution 2

also the same effect you get by this change:

//Livro l1 = new Livro();
  Livro l1 = new Main();

but I recommend solution 1

Posted 20-Jul-22 9:53am

zemiak123

Updated 20-Jul-22 9:55am

v2

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Chris Copeland · Accepted Answer · 2022-07-20T04:17:00

There's a few problems here. First, why is your Main class extending the Livro class? Typically the class containing the main() method shouldn't really extend anything.

Second, and a by-product of the first point, you've overridden the toString() method in the Main class, not in the Livro class (from what I can tell). So in your code you're creating instances of Livro:

Java

Livro l1 = new Livro();

But I hazard a guess that you've not overridden the toString() method in that class. You need to move the toString() method into the Livro class (and also annotate it with @Override, many IDEs will wag their fingers at you for not annotating it). For example: