Methoden Überschreiben
und @Override

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Wenn eine Klasse von einer anderen erbt, werden ja alle Attribute und Methoden implizit von der Oberklasse in die Unterklasse übernommen. Folgendes Beispiel:

Car.java

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public class Car {
    protected float speed;
    // ... Konstruktor
    public void slowDown() {
        speed *= 0.8;
    }
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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GolfCar.java

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public class GolfCar extends Car {
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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GolfCar erbt von Car und übernimmt daher implizit die Methode slowDown(). Wenn also irgendwo someGolfCar.slowDown() aufgerufen wird, passiert für das GolfCar genau das gleiche wie beim Aufruf von slowDown() auf einem Car Objekt. Was, wenn das Verhalten der Methode in der Unterklasse aber anders sein soll?

Hierfür ist es möglich, Methoden zu überschreiben:

Wenn die Signatur einer Methode der Unterklasse mit der Signatur einer Methode der Oberklasse übereinstimmt, wird beim Aufruf die Methode der Unterklasse ausgeführt. Man spricht hierbei davon, dass die Methode überschrieben wurde.

Der Übersicht halber vermerkt man eine überschriebene Methode mit @Override.

Im gegebenen Beispiel könnte also die Klasse GolfCar wie folgt verändert werden:

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public class GolfCar extends Car {
    @Override
    public void slowDown() {
        speed *= 0.5;
    }
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Falls nun auf ein GolfCar Objekt slowDown() aufgerufen wird, wird anstatt der Methode in Car nun die Methode in GolfCar ausgeführt.

Eine Sache habe ich dir verschwiegen

Wenn du eine Klasse nicht (durch Verwendung von extends) von einer anderen erben lässt, hat sie trotzdem eine Oberklasse. Der Grund dafür ist folgender:

Jede Klasse (ohne explizite Oberklasse) erbt implizit von der Klasse Object.

Und das hat einige Vorteile. Beispielsweise sind in der (standardmäßig vorhandenen) Klasse Object die Methoden toString() und equals() implementiert:

toString() wandelt ein Objekt in eine String Darstellung um. (Praktisches Feature: Falls ein Objekt an System.out.println() übergeben wird, gibt println() immer genau diese String Darstellung aus.)
equals(Object o) gibt true genau dann zurück, wenn das übergebene Objekt gleich ist wie die eigene Instanz

Jede Klasse in Java kann diese Methoden überschreiben, und damit selbst angeben, wie ein Objekt dieser Klasse als String aussehen soll, bzw. wann zwei Objekte dieser Klasse als gleich angesehen werden. Beispiel:

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public class Employee { // Erbt implizit von Object
    private String firstName;
    private String lastName;
    private long id;
    // ... Konstruktor
    @Override
    public String toString() {
        return firstName + " " + lastName;
    }
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Hier wird beim Aufruf von toString() nun der String "VORNAME NACHNAME" erzeugt, und nicht mehr der ursprüngliche Rückgabewert, den die Methode toString() in Object produziert hätte.

a) Füge zu der Klasse Shape aus der letzten Aufgabe eine Methode area() hinzu, die den Flächeninhalt der jeweiligen Figur als double zurückgibt:

In der Klasse Shape selbst darf als Platzhalter 0.0 zurückgegeben werden. Die restlichen Klassen sollen die Methode (falls sinnvoll) überschreiben und abhängig von der eigenen Figur einen passenden Wert zurückgeben.

Formeln für Flächeninhalte

Figur	Attribute	Formel für Flächeninhalt
Rechteck	Breite a, Höhe b	a · b
Quadrat	Seitenlänge a	a²
Kreis	Radius r	π · r²

Eine Annäherung für π bekommst du in Java über Math.PI.

b) Überschreibe anschließend in allen Klassen die toString() Methode, sodass der Code

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public static void main(String[] args) {
    System.out.println(new Shape(2.0, 3.0));
    System.out.println(new Rectangle(2.0, 3.0, 4.0, 5.0));
    System.out.println(new Square(2.0, 3.0, 4.0));
    System.out.println(new Circle(2.0, 3.0, 6.0));
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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folgende Ausgabe erzeugt:

Figur an Position (2.0, 3.0) mit Flächeninhalt 0.0
Rechteck-Figur an Position (2.0, 3.0) mit Flächeninhalt 20.0 und den Maßen 4.0 x 5.0
Gleichseitige Rechteck-Figur an Position (2.0, 3.0) mit Flächeninhalt 16.0 und den Maßen 4.0 x 4.0
Kreis-Figur an Position (2.0, 3.0) mit Flächeninhalt 113.09733552923255 und Radius 6.0

Häufige Fehlerquellen

java: method does not override or implement a method from a supertype: Du hast ein @Override vor einer Methode, die gar nicht in einer Oberklasse existiert
Falsche Berechnung der Flächeninhalte
Falsche Verwendung der super Aufrufe

Lösungsvorschlag Shape.java

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public class Shape {
    protected double posX;
    protected double posY;
    // ... Konstruktor
    public void move(double dx, double dy) {
        posX += dx;
        posY += dy;
    }
    public double area() { // Kein @Override, weil das ja die originale Methode ist
        return 0.0; // Platzhalter
    }
    @Override
    public String toString() {
        return "Figur an Position (" + posX + ", " + posY + ") mit Flächeninhalt "
            + area();
    }
    // ... Getter & Setter
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Lösungsvorschlag Rectangle.java

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public class Rectangle extends Shape {
    private double width;
    private double height;
    // ... Konstruktor
    @Override
    public double area() {
        return width * height;
    }
    @Override
    public String toString() {
        return "Rechteck-" + super.toString() + " und den Maßen "
            + width + " x " + height;
        /*
         * Der mittlere Teil ("Figur an Position [...]") kann durch super.toString()
         * ersetzt werden, weil die exakt gleiche Ausgabe sowieso schon durch die
         * toString() Methode in der Oberklasse Shape implementiert ist.
         */
    }
    // ... Getter & Setter
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Lösungsvorschlag Square.java

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public class Square extends Rectangle {
    // ... Konstruktor
    /*
     * Keine area() Methode, weil ja in der Oberklasse Rectangle
     * schon die korrekte Implementierung steht
     *
     * (size * size ist hier das gleiche wie width * height)
     */
    @Override
    public String toString() {
        return "Gleichseitige " + super.toString();
        /*
         * Der hintere Teil ("Rechteck-Figur an Position [...]") kann durch
         * super.toString() ersetzt werden, weil die exakt gleiche Ausgabe
         * sowieso schon durch die toString() Methode in der Oberklasse
         * Rectangle implementiert ist.
         */
    }
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Lösungsvorschlag Circle.java

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public class Circle extends Shape {
    private double radius;
    // ... Konstruktor
    @Override
    public double area() {
        return Math.PI * radius * radius;
    }
    @Override
    public String toString() {
        return "Kreis-" + super.toString() + " und Radius " + radius;
        // Erklärung analog zu Rectangle
    }
    // ... Getter & Setter
}
 
 
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