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The output from the program is shown here: Inside Area for Rectangle Area is 45 Inside Area for Triangle Area is 40 Area for Figure is undefined Area is 0 Through the dual mechanisms of inheritance and run-time polymorphism, it is possible to define one consistent interface that is used by several different, yet related, types of objects In this case, if an object is derived from Figure, then its area can be obtained by calling area( ) The interface to this operation is the same no matter what type of figure is being used

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The output shows that this setting is currently disabled (value=0) To turn on tcp_syncookie support, enter this command:

There are situations in which you will want to define a superclass that declares the structure of a given abstraction without providing a complete implementation of every method That is, sometimes you will want to create a superclass that only defines a generalized form that will be shared by all of its subclasses, leaving it to each subclass to fill in the details Such a class determines the nature of the methods that the subclasses must implement One way this situation can occur is when a superclass is unable to create a meaningful implementation for a method This is the case with the class Figure used in the preceding example The definition of area( ) is simply a placeholder It will not compute and display the area of any type of object As you will see as you create your own class libraries, it is not uncommon for a method to have no meaningful definition in the context of its superclass You can handle this situation two ways One way, as shown in the previous example, is to simply have it report a warning message While this approach can be useful in certain situations such as debugging it is not usually appropriate You may have methods that must be overridden by the subclass in order for the subclass to have any meaning Consider the class Triangle It has no meaning if area( ) is not defined In this case, you want some way to ensure that a subclass does, indeed, override all necessary methods Java s solution to this problem is the abstract method You can require that certain methods be overridden by subclasses by specifying the abstract type modifier These methods are sometimes referred to as subclasser responsibility because they have no implementation specified in the superclass Thus, a subclass must.

Part I:

Because /proc entries do not survive system reboots, you should add the following line to the end of your /etc/sysctlconf configuration file To do this using the echo command, type

override them it cannot simply use the version defined in the superclass To declare an abstract method, use this general form: abstract type name(parameter-list); As you can see, no method body is present Any class that contains one or more abstract methods must also be declared abstract To declare a class abstract, you simply use the abstract keyword in front of the class keyword at the beginning of the class declaration There can be no objects of an abstract class That is, an abstract class cannot be directly instantiated with the new operator Such objects would be useless, because an abstract class is not fully defined Also, you cannot declare abstract constructors, or abstract static methods Any subclass of an abstract class must either implement all of the abstract methods in the superclass, or be itself declared abstract Here is a simple example of a class with an abstract method, followed by a class which implements that method: