Download PDF by Adam Freeman, Darrel Ince: Active Java: Object-Oriented Programming for the World Wide

By Adam Freeman, Darrel Ince

ISBN-10: 0201403706

ISBN-13: 9780201403701

Covers the most principles in the back of the language and offers an intensive advent to new options and matters linked to utilizing Java. Illustrated all through with examples. Paper.

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Additional info for Active Java: Object-Oriented Programming for the World Wide Web

Example text

Integer values can be denoted by writing them as shown above or by writing them in octal or hexadecimal. If you wish to specify an integer in octal, the integer needs to be preceded with a zero; if you wish to write an integer in hexadecimal, you precede the integer with a 0 followed by an x. Thus: int streamId = 017, streamControlId = 0xF, switchId = 0xBB; declares three 32 bit integer variables. The first declaration sets streamId to be octal 17 (decimal 15), the second declaration sets the 32 bit integer variable streamControlId to be hexadecimal F (decimal 15) and the third declaration sets the 32 bit integer variable switchId to be hexadecimal BB (decimal 187).

The general format of the switch facility is: switch (argument){ case case case case case case ... case firstcase : secondcase: thirdcase : fourthcase: fifthcase : sixthcase : statements; statements; statements; statements; statements; statements; nthcase: statements; } Each of the cases firstcase, secondcase, thirdcase and so on can be integers or characters. The statements that are associated with each case can be a single statement or a compound statement. Each set of statements is executed when the case corresponding to the set of statements is delivered by the argument following the switch keyword.

For example, if we want a class B which inherits the methods and variables of A and provides code to implement AbsMethod then we would write: Class B extends A { // Any new instance variables // Code for method AbsMethod } Using the rules for inheritance, B would become a class from which objects can be created since the new code for AbsMethod would be used whenever a message involving AbsMethod is sent. You may think that this is a somewhat strange way to proceed. However, class libraries get much of their power from abstract classes.

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Active Java: Object-Oriented Programming for the World Wide Web by Adam Freeman, Darrel Ince

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