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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 those objects use inheritance, and there's a lot to learn if you wait to read user input until you have learned all these things. Much better to use a function or two. So here's how we open keyboard access and read a line:

  KeyRead source = new KeyRead();
  String said = source.readline();


Previously, we've used static methods to provide a keyboard reader, but we've updated the course now to use an object (a KeyRead) and a method on that object. It means a slightly more complex instruction session early in the course, but it gives us the advantage of being able to refer back to this use in a ouple of chapters when we first introduce objects properly to our delegates.
(written 2014-12-12, updated 2014-12-11)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J712 - Java - Exceptions
  [4396] Java Utility class - flexible replacement for array. Also cacheing in objects and multiple catch clauses example. - (2015-01-16)
  [3048] String handling - from first steps to practical examples - (2010-11-13)
  [3045] After Course Resources - do we publish sample answers. Example from Java Exceptions module. - (2010-11-13)
  [2862] Fail Safe Error Handling in Java via Exceptions - (2010-07-09)
  [2622] Handling unusual and error conditions - exceptions - (2010-02-03)
  [2420] Exceptions in Java - why and how - (2009-09-24)
  [1875] What are exceptions - Python based answer - (2008-11-08)
  [1066] Final, Finally and Finalize - three special words in Java - (2007-02-05)

J713 - Java - More Input and Output
  [4420] Flexibility in input - read from file, web resource or keyboard - (2015-02-08)
  [4414] Java - converting an integer to a fixed length string - (2015-02-04)
  [1239] End of File on a Java BufferedReader - (2007-06-22)

J702 - Hello Java World
  [2859] Using java, javac, jar, and CLASSPATH - a simple example - (2010-07-07)
  [2414] Hello World - a good traditional start to a Java course - (2009-09-22)


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Some other Articles
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When I am old, what will worry me?
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Arrays in Java - an introduction for newcomers
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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