So I have an array of 15 Flying Objects, The flyingObjects class consists of 1 variable (Price: Double) with its getters and setters. I also have an airplane class that extends FlyingObjects, a helicopter class that extends Airplane and quadrotor and multirotor class that extends helicopter. On the other side…
Tag: inheritance
Set parent class attribute in a child class
I trying to make a chess game and I will have a class for each chess piece but they will all extend class Piece. Piece class has a maxMovementDistance attribute but I would like to set that attribute in the child class (king, queen, pawn etc.) and it should also be final. What’s the best way to do this?…
Is it possible to override an inherited method with type parameter List with List?
I’m having trouble changing the type parameter of an inherited method. All animal subclasses need to implement a method animalList. What’s the best practice of doing this if i want the best possible code regarding readability and maintainability? Please note that this is extremely simplified i com…
Why does the call to a parent class constructor not call the parent’s methods that are overriden in the child class?
As shown in the code below, given a superclass Parent with a method calculate() that is called in Parent’s constructor, but also overriden in the class Child, why does the implicit call to Parent’s constructor within Child’s constructor not call Parent’s calculate() instead of Child…
How to call methods in different parent interfaces using child class name?
I am migrating a project from python to java. There is a multiple inheritanced python tool class, called Util(TimeUtil, MathUtil, FileUtil, …), it extend several Util classes. For example Normally, I would call Util.date_to_str(), Util.add(), Util.read_file() in python, importing class Util is enough, a…
Two classes and one method with different implementation for each of them
I’m just starting to learn OOP in Java, so this might be a dumb question. The Cat class extends Animal, they have a constructor, a static array, a method that fills the array, and a method that creates an object of the Moving class. On this created object of class Moving, the walk() method can be invoke…
How does java dialog inheritance work? I lose some properties
Sorry I don’t have much knowledge about Java or swing applications. I created a dialog called DlgShape and in it i have 2 text fields, 2 buttons and 2 labels. I tried creating DlgRectangle and instead of it inheriting from JDialog I inherited from DlgShape. The design of the parent and child class are i…
Why does super() not get called in the other constuctor?
If both House() and House(name) are called then why is not “Building” printed two times, but instead one time? Output: Answer House(String name) calls this() which is the same as House(). House() implicitly calls super() which is the same as Building(). You never call Building(String name). House(…
override graphstream’s DefaultMouseManager
I’m using GraphStream to show a map of an area and I’ve tried to inherit from the default MouseManager DefaultMouseManager and to override the mouseClicked method so that when clicking on a node the following will happened: node’s color will change. node’s label will show. node’s…
Java 8: Child should inherit methods from parent but return itself (FluentApi)
I want to do Inheritance with the concept of fluent api. So the parent Class is defining its methods and return itself (this). The child should be able to use this methods but return not the parent but its own class instance! How can I achieve this? I want to instantiate the parent, so abstract is not a optio…