Basic Java class for java teaching proposes :)

Animal.java

// The class is visible from outside the package 
// the class itself is not the object but is the 
// description of its behaviour and its data structure. 
// (The PROJECT)

public class Animal {
    
        private String race = "Uknown";
        private int age;
        private float weight;
        private String name;
        private char sex;


    // Constructor method useful to get an instance of the class (FACTORY)
    // http://beginnersbook.com/2013/03/constructors-in-java/
    // REMIND: No return type and not return within the costructor 
    public Animal (String r, int a, float w,String n, char s ) {
        
        race = r;
        age = a;
        weight = w;
        name = n;
        sex = s;
        
        }

    
    /* Getters and Setters */
    // Sets the value of our private field
    public String setRace(String race){    //<<---------------//
            String oldRace = this.race;                       //
            this.race = race;                                 //
            return oldRace;                                   //
        }                                                     // Which is the difference between these two methods?
                                                              // 
    // Sets the value of our private field                    //
    public void setRaceVoid(String race){  //<<---------------//
        this.race = race;                
    }


    // Getting the race value
    public String getRace(){
            return race;
        }
    
    // main method: always public, static and takes an array of strings as input
    public static void main(String [] args) {
            
            Animal animal1 = new Animal("Husky",8,23.4f,"Zoe",'F');
            System.out.println( animal1.getRace() );
            String oldRace = animal1.setRace("Puli");
            System.out.println( oldRace );
            System.out.println( animal1.getRace() );
            animal1.setRaceVoid( oldRace );
            System.out.println( animal1.getRace() );
        
        }
}

// Without running the code, wich is the value of race at the end of the program?