static void Main(string[] args)
{
Director director = new Director();
//构造加法运算
BinaryOperationBuilder addBinaryOperationBuilder = new AddBinaryOperationBuilder();
director.BuildBinaryOperation(addBinaryOperationBuilder);
BinaryOperation addBinaryOperation = addBinaryOperationBuilder.GetBinaryOperation();
addBinaryOperation.Show();
//构造减法运算
BinaryOperationBuilder subBinaryOperationBuilder = new SubBinaryOperationBuilder();
director.BuildBinaryOperation(subBinaryOperationBuilder);
BinaryOperation subBinaryOperation = subBinaryOperationBuilder.GetBinaryOperation();
subBinaryOperation.Show();
Console.ReadKey();
}