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Java module J713
More Input and Output
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 articles
Formatting to a fixed number of decimal places

Articles and tips on this subjectupdated
4420Flexibility 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 ...
2015-02-12
 
4414Java - 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 ...
2015-02-04
 
4350Keyboard 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 ...
2014-12-11
 
2420Exceptions 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 ...
2009-09-25
 
Examples from our training material
Javafgrep.java   Example for modification exercise
bratton.java   Formatted Printing
d2x.java   Application using multiple classes
d3y.java   Exercise based on day 2 template
farleigh.java   Checking file status, reading and writing
snip1   Code snippet - reading from a file
snip2   File existence checking
snip3   Writing to a file
wellreader.java   Sample Input class from earlier courses and modules
winsley.java   File Manipulation examples
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Overview.
The Wellreader class.
Input/output from basics.
Streams.
Writing to a file.
Formatted output.
Reading from a file.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Java,Ruby, Lua, Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre.


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