Overload & Override

/*
 * Static polymorphism (function overloading; deutsch: Überladung)
 * Adalah fungsi lebih dari satu dengan nama yang sama tapi berbeda parameter.
 * -> Lihat ChangeData!
 */

package polymorphism;

public class User {

    String username, password;

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

    public void ChangeData(String username) {
        this.username = username;
    }

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

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

}

/*
 * Dynamic polymorphism (function overriding; deutch: Überlagerung)
 * -> numpuk fungsi dari class si super.
 * Contoh: Di class User ada fungsi toString. Di class StandardUser
 * juga ada toString(). Fungsi toString dari User ditumpuk sama fungsi
 * toString() dari StandardUser.
 */

package polymorphism;

public class StandardUser extends User {

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

    public String toString() { // ini numpuk dari si class User
        return "[" + this.username + "," + this.password + ";" + "standard" + "]";
    }

}