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Explain Subclasses and Polymorphism ?
Car and Motorcycle are subclasses of MotorVehicle. If you instantiate a Car or a Motorcycle along with new, you can use in which object anywhere you can use a MotorVehicle, since cars are motor vehicles. As same you can use a Motorcycle anywhere you can use a MotorVehicle. This use of a subclass object in place of a superclass object is the starting of polymorphism. I'll say more about polymorphism later.
The converse is not true. While all cars are motor vehicles, not all motor vehicles are cars. A few are motorcycles. Thus if a method expects a Car object you shouldn't provides it a MotorVehicle object instead.
Remember that I said you shouldn't provide a method in which expects a Car a MotorVehicle. I didn't say you couldn't. Objects can be cast into their subclasses. This is useful while using data structures like Vectors that only handle generic objects. It's up to the programmer to remain track of what kind of object is stored in a Vector, and to use it accordingly.
The proper choice of classes and subclasses is a skill learned primarily by experience. There are often different ways to define classes.toString() as example of polymorphism
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QUESTION 3: Overloaded methods Write the overloaded method named average () for each of the following problems: a) The first method receives THREE (3) integer values and returns
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In RPC the method invoker waits for the method to finish implementation and return the control back to the invoker. Therefore it is completely synchronous in nature. Whereas in JMS
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I''ve been trying to get this java program to work but im lost and Im stuck ! The factorial of a positive integer N, denoted by N! N!=1*2*...*N Using subprograms and f unctions,c
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A final class will not be extended i.e. A final method cannot be overridden when its class is added. You can't modify value of a final variable.
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What is static in java? Static means one per class, not one for each object no matter how many example of a class might exist. This means that you can use them without making a
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