How to code complex conditions
Hello worldFirst of all, please forgive if I don't use the programming terminology correctly, I'm a beginner with no computer training.
My question is a general: what is the right approach for complicated code conditions?
I start with a good example that is actually something concrete I should do in my little application:
TODO: shorten/shorten a complete person by name to fit a character 16
For example: Johnathan-> J necromancer necromancer
There are many possibilities how to make based on the length of the first, model and other names and there is an order of preference for these solutions.
So if possible shorten only the name as above; If it is too long and then leave some space and so on. These would be the preferences demonstrated by examples:
1 J L Smith
2 JL Smith
3 JLSmith
4 John Languely S
5 John Lang B S
6 John L S
7 JohnLS
8 J L S
9 JLS
How to encode? With the nested If if if-else blocks or in some other way?
First of all I did with the nested If - s, but it was sort of a mess after some time, so the easiest way for me was to do the following:
(Just 'calculate' names abbreviated in order of preference, and return if it fits in the 16 characters.)
if (displayName.length() > 16) {
String[] dn = displayName.split("\\s+");
String lName = dn[dn.length - 1];
StringBuffer dName16 = new StringBuffer();
// J L Smith
dName16 = new StringBuffer();
for (int i = 0; i < dn.length - 1; i++) {
dName16.append(dn.charAt(0) + " ");
}
dName16.append(lName);
if (dName16.length() <= 16){
return new String(dName16);
}
// JL Smith
dName16 = new StringBuffer();
for (int i = 0; i < dn.length - 1; i++) {
dName16.append(dn[i].charAt(0));
}
dName16.append(" " + lName);
if (dName16.length() <= 16){
return new String(dName16);
}
// JLSmith
dName16 = new StringBuffer();
for (int i = 0; i < dn.length - 1; i++) {
dName16.append(dn[i].charAt(0));
}
dName16.append(lName);
if (dName16.length() <= 16){
return new String(dName16);
}
//more code..
I would like to know how to approach these kind of situations effectively and clearly in the least error prone way. How to code complex conditions? Is there any book or theory about it?
I am not sure it is clear what I am asking, but I will follow up with more description on what I mean later. But please comment, ask, advice anything in the meantime - I would really appreciate any help with this.
Thank you in advance!
lemonboston
Hello lemonboston,
If you compare that with my proposal there are only a few more steps to get there.
The iteration on your list looks almost exactly like mine...
Right now, your convertDisplayNameToFitIn method has two responsibilities: building the list and selecting the abbreviation. You will have to hunt in the methods that they own.
Beside that, you need to declare types interface references where possible. I got this abbreviatedList thing should be reported as list rather than ArrayList
List abbreviatedList = new ArrayList();
Good bye
DPT
Tags: Java
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