What is wrong in the following abstract class definition? abstract class XY { abstract int sum (int x, int y) { } }
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What is wrong in the following abstract class definition?
abstract class XY {
abstract int sum (int x, int y) { }
}
Step by step
Solved in 2 steps
- Could it ever make sense to define a class as abstract if it has no abstract methods? Discuss thisModify and rewrite the Food class to an abstract class, so that no instance of Food class can be createdA subclass of an abstract class is required to implement all of the abstract methods of the parent class. Is it correct or incorrect?
- Is it ever justified to declare a class abstract if it lacks abstract methods? Examine this.Can an abstract class have concrete (non-abstract) methods? Can a concrete class have abstract methods? Can you have an abstract class without abstract methods? Justify your answers.Abstract classes and interfaces can both be used to specify common behavior of objects.How do you decide whether to use an interface or an abstract class? Explain youranswer.
- You are going to declare an abstract class called Player. In the abstract class Player, it should contain common methods found for both Human Player and Al Player. Talk with your team which classes in the Player class should be declared abstract and which ones are supposed to be non-abstract (regular methods). Both Human Player and Al Player should inherit the abstract Player class. Code:In order to qualify as a subclass of an abstract class, a class must offer concrete implementations for all of the abstract methods defined in the abstract parent class. Exactly how do you feel about this?Implement abstraction on animal and car classes (in java) e.g animal and car is a abstract class.
- Give me a code example where you can decouple the classes with the help of Interface? II. Give a code example to show the difference between an abstract class and Interface? III. Give a code example to show the implementation of Abstraction Principle?The parent class is A, and its subclasses are B and C. Now, B and C share several characteristics and methods, but their implementations of some of their methods are drastically different. Using logic, define what A will be - a concrete class, an abstract class, or an interface.Java Abstract classes can be defined without any abstract methods" - Support this statement with proper reasoning.