Compare two objects with .equals() and == operator

Question

I constructed a class with one String field. Then I created two objects and I have to compare them using == operator and .equals() too

Answer 1

You should override equals

 public boolean equals (Object obj) {
     if (this==obj) return true;
     if (this == null) return false;
     if (this.getClass() != obj.getClass()) return false;
     // Class name is Employ & have lastname
     Employe emp = (Employee) obj ;
     return this.lastname.equals(emp.getlastname());
 }