Strategy Pattern VS Static Class

Mohammed Mostafa

need someone professional help me get the difference beteen

first :

static class SimpleMathOperations
{
public static double add(double a, double b) { return a + b; }
public static double subtract(double a, double b) { return a - b; }
public static double multiply(double a, double b) { return a * b; }
public static double divide(double a, double b) { return a / b; } }

second : Implementing the strategy pattern

public interface IMathOperation { double PerformOperation(double A, double B); }
// ADD -----------------------------------------------
class AddOperation: IMathOperation
{
#region IMathOperation Members
public double PerformOperation(double A, double B)
{ return A + B; }

#endregion }
// Subtract -----------------------------------------------
class SubtractOperation: IMathOperation
{
#region IMathOperation Members

public double PerformOperation(double A, double B)
{ return A - B; }

#endregion }
// MULTILPY -----------------------------------------------

class MultiplyOperation: IMathOperation
{
#region IMathOperation Members public double PerformOperation(double A, double B) { return A * B; }

#endregion }
// DIVIDE -----------------------------------------------
class DivideOperation: IMathOperation
{ #region IMathOperation Members public double PerformOperation(double A, double B) { return A/B; } #endregion }

I quoted strategy pattern from this website
http://www.c-sharpcorner.com/UploadFile/rmcochran/strategyPattern08072006095804AM/strategyPattern.aspx[^]

3 Replies

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Vulpes15y ago
Well, the strategy pattern in this case seems both long-winded and counter-intuitive, so I'd stick with the static class.
Mohammed Mostafa15y ago
so I don't need to implement the strategy pattern ???? because the static method give me the same result thx 4 ur reply
Vulpes15y ago
Well, in the first case you just have a static class which has four methods which perform the basic operations on doubles: add, subtract, multiply and divide.

To call one of these you simply do:

double a = 3.5;
double b = 2.5;
double c = SimpleMathOperations.add(a, b);
Console.WriteLine(c); // 6

In the second case you have an interface which has a single method, PerformOperation, which performs a binary operation on doubles.

To cater for all 4 basic operations, you need to define four classes which implement this interface in the appropriate ways.

For example:

AddOperation addop = new AddOperation();
double a = 3.5;
double b = 2.5;
double c = addop.PerformOperation(a, b);
Console.WriteLine(c); // 6