Please help me to know why contrasena and fcontrasena are not equal?

Question

public void ingresarContrasena(String contrasena){

String fcontrasena;
try{
String direccion="C:\\new folder\\registro\\"+correo+".txt";
File conar=new File(direccion);
Scanner reader=new Scanner(conar);
else{System.out.println("Correo no encontrado.");}

while(reader.hasNext()){
fcontrasena=String.valueOf(reader.next());
if(contrasena==fcontrasena){
System.out.println("Contrasena correcta");
}
else{
System.out.println("Contrasena incorrecta");
}
}
reader.close();
}catch(Exception e){}
}

Answer 1

Ok, i just solved using:

contrasena.equals(fcontrasena)

Aparrently both variables are allocated on different memory address and that is what "==" where comparing.

If you have a better explanation, let me know pls!