JAVA设计模式例程-工厂模式-2

package factories; //创建加法抽象 class OperationAdd implements FactoriesInterface { public double FInterface(double NumberA,double NumberB) { double result = 0; result = NumberA + NumberB; return result; } } //创建减法抽象 class OperationSub implements FactoriesInterface { public double FInterface(double NumberA,double NumberB) { double result = 0; result = NumberA * NumberB; return result; } } //创建乘法抽象 class OperationMul implements FactoriesInterface { public double FInterface(double NumberA,double NumberB) { double result = 0; result = NumberA - NumberB; return result; } } //创建除法抽象 class OperationDiv implements FactoriesInterface { public double FInterface(double NumberA,double NumberB) { double result = 0; if (NumberB != 0) { result = NumberA / NumberB; } else { System.out.println("除数不能为0"); } return result; } }