子類創建時原來也要創建父類

class Art {
public Art() {
System.out.println("Art constructor");
}
}

class Drawing extends Art{
public Drawing() {
System.out.println("Drawing constructor");
}
}

class Cartoon extends Drawing{
public Cartoon(){
System.out.println("Cartoon construtor");
}
public static void main(String[] args){
Cartoon x = new Cartoon();
}
}

會得到這樣得結果：

Art constructor
Drawing constructor
Cartoon construtor