Exercises, examples and other material relating to training module J713. This topic is presented on public courses Learning to Program in Java
, Java Bootcamp
, Java Programming for the Web
This module covers reading and writing from and to files, other processes, network connections, keyboards and screens. Also how to find out if an object exists on your file system and if it does, to get more information about it.
Related technical and longer articlesFormatting to a fixed number of decimal places
|Articles and tips on this subject||updated|
|4420||Flexibility in input - read from file, web resource or keyboard|
When you're writing a program, don't think that you're reading from a file - think that you're reading from a stream. That gives you the flexibiity to read from a file, or from a web resource, or from a device such as a keyoard.
A stream is an input flow of data that comes to you, record by record (typically ...
|4414||Java - converting an integer to a fixed length string|
There are some things in Java which you would think are no-brainers (one-liners) but turn out to be not quite so simple. This issue has improved over the years, with additions of methods like split to java.lang.String, but some gaps remain. And the solution - the joy of an OO langauge - is for you ...
|4350||Keyboard reader for Java programming newcomers|
I've added a new class of Keyboard Reader for our Java courses [here], for the earlier examples and exercises just after "Hello World". We want to be able to teach people to write a read - calculate - write program early on, but Java inputs require exception handling, and exceptions are objects, and ...
|2420||Exceptions in Java - why and how|
Although it's common practise to include a static main test program in a class, it's something that newcomers can have some difficulty following ... so we don't do it too early on the course - we keep classes and programs that use those classes (even if they are just test programs) each in their own ...
Examples from our training material
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Topics covered in this module
The Wellreader class.
Input/output from basics.
Writing to a file.
Reading from a file.
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