Object Oriented Design

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

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By Adam Freeman, Darrel Ince

Covers the most rules at the back of the language and offers a radical creation to new options and concerns linked to utilizing Java. Illustrated all through with examples. Paper.

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Extra resources for Active Java: Object-Oriented Programming for the World Wide Web

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It is worth showing at this point how a disciplined form of unconditional transfer of control can be used within Java, a form of control which is similar to the goto statement, but which is of a more limited form that enhances readability. In the text which described the switch statement we described the use of the break statement. The effect of this statement, within the context of the switch statement, was to transfer control to the end of the statement, that is, to the statement which followed the switch statement.

There are five main class libraries: • The language foundation classes. These classes implement low-level data types such as integer and contain the code for the methods which operate on these basic data types. • The I/O class library. This contains classes which provide facilities for low-level input/output, for example for the reading of data from files. • Another window toolkit class library. This contains all the classes needed for the interaction between an applet and the user. It contains classes for basic HCI components such as fonts, colours, events, buttons and scroll bars.

Objects described by the former are constants which cannot be changed, while objects described by the latter can be modified. Normally Java code involves strings being converted into StringBuffers, modified and then reconverted into strings. There are a number of ways of creating Strings and StringBuffers. The first is to declare them using the normal declaration facility that you have seen previously. For example, the declaration: String filename, rootDirectory; StringBuffer userName; declares two strings called filename and rootDirectory and a StringBuffer called userName.

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