Abstract classes only become useful when they polymorphic instantiated a subclass of java.lang.Object extended are ...
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- In Java a class is allowed to inherit from as many superclasses as needed. True FalsePolymorphism in Java is Select one: a.when a program uses several different types of objects, each with its own variable. b.when a single variable is used with several different types of related objects in a program. c.when a single parent class has many child classes The following code fragment is polymorphic: for(Shape shape : shapes) if(shape instanceof Circle) { Circle c = (Circle) shape; // cast to a circle c.draw(g); // call the circle's draw method } else if(shape instanceof Rect) { Rect r = (Rect) shape; r.draw(g); } True or False The following code fragment is polymorphic: for(Shape shape : shapes) shape.draw(g) True or FalseThis is for java
- Subclasses of abstract classes must implement the parent class's abstract methods. You think?Object models, as well as the concepts of encapsulation and polymorphism, are inexorably intertwined.What is polymorphism in Java? It is when a program uses several different types of objects, each with its own variable. It is when a single variable is used with several different types of related objects at different places in a program. It is when a single parent class has many child classes. It is when a class has several methods with the same name but different parameter types.
- javaJava Programming I am using intellij to write my code 1. Implement the shape hierarchy shown above, in which Shape, TwoDeimentionalShape and ThreeDimentionalShape should be abstract classes.2. Include abstract method getArea in the TwoDimensionalShape class. Also, include abstract methods getArea and getVolume in the ThreeDimensionalShape class. 3. Each subclass of TwoDimensionalShape should contain method getArea to calculate the area of the twodimensional shape.4. Each subclass of ThreeDimensionalShape should have getArea and getVolume to calculate the surface area and volume.5. Override the toString method in each concrete class (third level), to include basic information about the object, e.g., “Sphere object, radius = 4” • Create a test program that uses an array of Shape references to objects of each concrete class in the hierarchy. For example,Shape[] shapes = new Shapes [5];Shape[0] = new Circle(2);• Create a loop that process all the shapes in the array, print basic…A subclass of an abstract class must be able to do all of the things the parent class can do. True or not?