VV-ISTIC-TP2/exercises/tcc-vs-lcc.md

TCC vs LCC

Explain under which circumstances Tight Class Cohesion (TCC) and Loose Class Cohesion (LCC) metrics produce the same value for a given Java class. Build an example of such as class and include the code below or find one example in an open-source project from Github and include the link to the class below. Could LCC be lower than TCC for any given class? Explain.

A refresher on TCC and LCC is available in the course notes.

Answer

Pour que TCC et LCC soient égaux, il faut que toutes les paires soient directes.

Ainsi par exemple :

A(){
    x;
    y;
}
B(){
    x;
    y;
}
C(){
    y;
}
D(){
    z;
}
E(){
    z;
}

flowchart

    A --"x,y"--- B
    B --"y"--- C
    C --"y"--- A

    D --"z"--- E

Ici, on a donc un total de 10 paires possibles, 4 liaisons directes, et aucun pair uniquement possible par une liaison indirecte. TCC = 4/10 LCC = 4/10