Difference between revisions of "Composition - 2017"
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| − | Composition is where | + | Composition is where objects created within another object are destroyed along with the containing object. |
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<syntaxhighlight lang="csharp"> | <syntaxhighlight lang="csharp"> | ||
class Location | class Location | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | The Warren class | + | The Warren class declares an array of Rabbit. The constructor method for Warren creates each rabbit: |
<syntaxhighlight lang="csharp"> | <syntaxhighlight lang="csharp"> | ||
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So if a Warren is destroyed it will destroy all of the rabbits in that warren also. | So if a Warren is destroyed it will destroy all of the rabbits in that warren also. | ||
| + | |||
| + | =Conclusion= | ||
| + | The following are therefore examples of composition (Composition shown with Filled Diamond): | ||
| + | *Location to Fox | ||
| + | *Location to Warren | ||
| + | *Warren to Rabbit | ||
| + | *Simulation to Location | ||
Latest revision as of 12:48, 28 May 2017
Composition is where objects created within another object are destroyed along with the containing object.
class Location
{
public Fox Fox;
public Warren Warren;
public Location()
{
Fox = null;
Warren = null;
}
}
As you can see Location is creates an instance of Fox & Warren. So if you remove the instance of location then the Fox & Warren instances for that location will also be destroyed.
Other Examples
Warrens & Rabbits - warren creates and destroys rabbits:
class Warren
{
private const int MaxRabbitsInWarren = 99;
private Rabbit[] Rabbits;
private int RabbitCount = 0;
The Warren class declares an array of Rabbit. The constructor method for Warren creates each rabbit:
public Warren(int Variability)
{
this.Variability = Variability;
Rabbits = new Rabbit[MaxRabbitsInWarren];
RabbitCount = (int)(CalculateRandomValue((int)(MaxRabbitsInWarren / 4), this.Variability));
for (int r = 0; r < RabbitCount; r++)
{
Rabbits[r] = new Rabbit(Variability);
}
}
So if a Warren is destroyed it will destroy all of the rabbits in that warren also.
Conclusion
The following are therefore examples of composition (Composition shown with Filled Diamond):
- Location to Fox
- Location to Warren
- Warren to Rabbit
- Simulation to Location
