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The following code shows an abstract class called AbClass with two methods. The first method is a normal method with an implementation that prints out the name of the class. The second method is an abstract method that must be implemented in a derived class. Class DerivedClass inherits from AbClass, and implements and overrides the abstract method. Main creates an object of DerivedClass and calls its two methods. Keyword abstract class AbClass { public void IdentifyBase() { Console.WriteLine("I am AbClass"); } Keyword abstract public void IdentifyDerived(); } class DerivedClass : AbClass { Keyword override public void IdentifyDerived() { Console.WriteLine("I am DerivedClass"); } } class Example { static void Main() { // AbClass a = new AbClass(); // a.IdentifyDerived();

DerivedClass b = new DerivedClass(); // Instantiate the derived class. b.IdentifyBase(); // Call the inherited method. b.IdentifyDerived(); // Call the "abstract" method. } } This code produces the following output: I am AbClass I am DerivedClass

Analyzing 25 Designing 28 Mechanism Characteristics 29 Network Characteristics 34 Applying Philosophy 35 Very Broad Philosophy 42 General Recommendation 44.

Everything in this book was created with various releases of the early access software to provide you with example after example of the new APIs. It is assumed that you have a reasonable level of knowledge of the Java programming language and earlier libraries, leaving the following pages to describe that which is being introduced into the next standard release of the Java Platform, Standard Edition.

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In the previous section, you saw that an abstract class must be used as a base class it cannot be instantiated as a stand-alone class. The opposite is true of a sealed class. A sealed class can be used only as a stand-alone class it cannot be used as a base class. A sealed class is labeled with the sealed modifier. For example, the following class is a sealed class. Any attempt to use it as the base class of another class will produce a compile error. Keyword sealed class MyClass { ... }

A static class is a class where all the members are static. Static classes are used to group data and functions that are not affected by instance data. A common use of a static class might be to create a math library containing sets of mathematical methods. The important things to know about static classes are the following: The class itself must be marked static. All the members of the class must be static. The class can have a static constructor, but not an instance constructor. You cannot create an instance of the class. You cannot inherit from static classes they re sealed. You access the members just as you would access any static member, by using the class name and the member name. The following code shows an example of a static class: Class must be marked static static public class MyMath { public static float PI = 3.14f; public static bool IsOdd(int x) { return x % 2 == 1; } Members must be static public static int Times2(int x) { return 2 * x; } } class Program { static void Main( ) { Use class name and member name. int val = 3; Console.WriteLine("{0} is odd is {1}.", val, MyMath.IsOdd(val)); Console.WriteLine("{0} * 2 = {1}.", val, MyMath.Times2(val)); } } This code produces the following output: 3 is odd is True. 3 * 2 = 6.

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