Polymorphism

/*
 * Polymorphism
 * Poly = banyak; Morph = jenis
 *
 * Contoh: Hewan bisa diextend jadi Burung, Singa, dll.
 * Burung, Singa, dll. adalah Hewan.
 *
 * Contoh dibawah: StandardUser & Admin adalah User,
 * jadi StandardUser & Admin bisa disebut sebagai object User juga
 */

// Class User

package polymorphism;

public class User {

    String username, password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String toString() {
        return "[" + this.username + "," + this.password + "]";
    }

}

// Class StandardUser

package polymorphism;

public class StandardUser extends User {

    public StandardUser(String username, String password) {
        super(username, password);
    }

    public String toString() {
        return "[" + this.username + "," + this.password + ";" + "standard" + "]";
    }

}

// Class Administrator

package polymorphism;

public class Administrator extends User {

    public Administrator(String username, String password) {
        super(username, password);
    }

    public String toString() {
        return "[" + this.username + "," + this.password + ";" + "administrator" + "]";
    }

}

// Main

package polymorphism;

public class Program {

    public static void main(String[] args) {

        User[] users = new User[3];
        users[0] = new User("vanilla-user","password");
        users[1] = new StandardUser("iamstandard","mypass");
        users[2] = new Administrator("iamsuper","secret");

        System.out.println(users[0]); // [vanilla-user,password]
        System.out.println(users[1]); // [iamstandard,mypass;standard]
        System.out.println(users[2]); // [iamsuper,secret;administrator]

    }

}