Developing Java Software by Russel Winder, Graham Roberts

By Russel Winder, Graham Roberts

The hot version of this wonderful primer teaches how one can software in an object-oriented variety. items come first delivering a framework for realizing how Java courses paintings and the way they are often designed, in an organised and systematic method. Programming is taught as a way to caliber software program engineering and is anchored in genuine international matters, quite trying out. Examples and routines supply motivation. Self- checks and sophistication venture feedback improve this accomplished research package.

The objective of this publication is to take readers from the fundamental rules of object-oriented layout and programming utilizing Java via to category library building and alertness improvement.

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Additional resources for Developing Java Software

Example text

This section is about data files, which provide a place to store data independently of the execution of any program. As the name implies, a data file is a named file stored on a disk drive or file server that contains data. The data can be in many different formats or representations but in this section we will consider data files holding data represented using text and characters. Data files can essentially be thought of as containers where the values are stored outside a program. At the lowest level of abstraction, files are essentially arrays of bytes that are held on disk rather than in memory.

The only reason we mention this historical (mis-) feature is that you might see it used in older Java code. 2 Array Indexing. Once created, an array is accessed using the index operator, with expressions such as: int j = n[2] ; // Access value stored in array at position 2. n[0] = 1 ; // Assign a value to array element 0. The index operator is denoted by square brackets applied to an array variable â this is a different use of [] than that in array variable declarations.

3 Array Parameters and Return Values Arrays can be passed as parameters to methods and returned as the result. However, the effects of the parameter mechanism when applied to arrays are very different compared to when applied to primitive types and so requires closer examination. An array parameter is specified in the same way as any other parameter, using a parameter variable declaration. f(n)Â ; ... This is essentially no different to what happened with primitive types, except that, we are passing the array reference and not the array object as a parameter: the parameter variable and parameter value are references to an array object.

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