设计模式-工厂方法模式

类图：

public interface IFactory {
    public Operation createOperation();
}

public class AddOperationFactory implements IFactory {

    @Override
    public Operation createOperation() {
        return new AddOperation();
    }
}

public class Client {

    public static void main(String[] args)
    {
        IFactory addFactory = new AddOperationFactory();
        Operation add = addFactory.createOperation();
        add.setNumberA(1);
        add.setNumberB(2);
        System.out.println(add.getResult());
    }
}

图片引用自：《大话设计模式》-程杰