Wich of the programs is wrong?and why?

Question

For the class defined as follows

public class Bidon{ int x;}

Wich of the programs is wrong?and why?
▪︎Bidon a=new Bidon(3);
▪︎Bidon a=new Bidon() ; String s=a.toString();
▪︎Bidon a=new Bidon() ; boolean b=a.equal("bonjour");
▪︎Bidon a=new Bidon() ; boolean b=a.equal(a);

Answer 1

Post a link to a MWE code please

https://www.sololearn.com/post/75089/?ref=app

Answer 2

hossin Chorfi Duplicate question I just answered on the other one please delete.