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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Long, Longer, Longest in Java

If you want to find out how long a Film3 is, in the class that I use on our private Java Programming courses, you can call the getminutes method. That's standard OO stuff. But what if you want to find out which is the longer of two Film3s or the longest of a whole array of them?

Don't re-write code!!!. So your longer method should call getminutes, and your longest method should call either longer or getminutes directly. Here's an example:

public int getminutes() {
   return minutes;
   }
public Film3 longer(Film3 that) {
   int m1 = this.getminutes();
   int m2 = that.getminutes();
   if (m1 < m2) return that;
   return this;
   }
public static Film3 longest(Film3 [] ofthese) {
   Film3 sofar = ofthese[0];
   for (int owabout=1; owabout<ofthese.length; owabout++) {
   sofar = sofar.longer(ofthese[owabout]);
   }
   return sofar;
   }


longer is a method that runs on one object, with another passed in as a parameter:
  current = Library[1].longer(Library[2]);

By contrast, longest is a class or static method that runs on a whole array of objects:
  current = Film3.longest(Library);


You might wonder if longest could simply have run on the class as a whole and returned the largest defined Film3, but that would not be a good solution as you're likely to want to find (say) the longest horror film or the longest one for children, which will all be defined at the same time.

Links - Sample Program and the class that goes with it
(written 2008-11-25, updated 2008-11-24)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J706 - Java - Objects and Classes
  [96] Variable Scope - (2004-10-22)
  [477] Class, static and unbound variables - (2005-10-25)
  [1163] A better alternative to cutting and pasting code - (2007-04-26)
  [1296] An example of Java Inheritance from scratch - (2007-08-08)
  [1500] First Class Java. First step and moving forward. - (2008-01-10)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)
  [2169] When should I use OO techniques? - (2009-05-11)
  [2422] Looking inside Java classes - javap and javadoc - (2009-09-25)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [2651] Calculation within objects - early, last minute, or cached? - (2010-02-26)
  [4413] Binomial Coefficient (Pascal Triangle) objects in Java - (2015-02-03)
  [4422] Objects - from physical to virtual or abstract - Java - (2015-02-10)


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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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