工厂模式（Factory Method）

工厂设计模式：定义一个用于创建对象的接口，让子类决定实例化那个类，工厂方法使一个类的实例化延迟到其子类

简单案例（加法计算器）

//加减乘除操作工厂

[java]
public inte易做图ce OperationInte易做图ce {
public double operate(int a,int b);
}

public inte易做图ce OperationInte易做图ce {
public double operate(int a,int b);
}
//创建加减乘除的工厂
[java]
public inte易做图ce FactoryInteface{
public OperationInte易做图ce CreateFactory();
}

public inte易做图ce FactoryInteface{
    public OperationInte易做图ce CreateFactory();
}//加法操作类
[java]
public class OperationAdd implements OperationInte易做图ce {

    @Override
    public double operate(int a, int b) {
        return a+b;
    }

}

public class OperationAdd implements OperationInte易做图ce {

    @Override
    public double operate(int a, int b) {
        return a+b;
    }

}//创建加法这一操作的工厂

[java]
public class FactoryAdd implements FactoryInteface{

    @Override
    public OperationInte易做图ce CreateFactory() {
        return new OperationAdd();
    }
}

public class FactoryAdd implements FactoryInteface{

    @Override
    public OperationInte易做图ce CreateFactory() {
        return new OperationAdd();
    }
}//主函数调用
[java
public class Factory {
    public static void main(String[] arg)
    {
        FactoryAdd factoryAdd = new FactoryAdd();
        OperationInte易做图ce add = factoryAdd.CreateFactory();
        System.out.println(add.operate(23, 123));
    }
}

public class Factory {
    public static void main(String[] arg)
    {
        FactoryAdd factoryAdd = new FactoryAdd();
        OperationInte易做图ce add = factoryAdd.CreateFactory();
        System.out.println(add.operate(23, 123));
    }
}

补充：软件开发 , C++ ,