Java getClass and super classes

Question

public boolean equals(Object o) {
    if (this == o)
        return true;
    if ((o == null) || (this.getClass() != o.getClass()))
        return false;
    else {
        AlunoTE umAluno = (AlunoTE) o;
        return(this.nomeEmpresa.equals(umAluno.getNomeEmpresa()) && super.equals(umAluno);
    }
}

Could anyone explain me how the fourth line ((this.getClass() != o.getClass())) works when the argument is a super class? Because the classes have different names. this.getClass will return a different name than o.getClass, right?

Answer 1

Check the following code snippet which answers your question. Object O can hold any object. o.getClass() will return the run time class of the object

public class Main {
  void method(Object o) {
    System.out.println(this.getClass() == o.getClass());
  }

  public static void main(String[] args) {
    new Main().method(new Object());  // false
    new Main().method(new Main());    // true
    new Main().method(new String());  // false
    new Main().method(new MainOne()); // false
  }
}

class MainOne extends Main
{
}