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设计模式2---工厂模式

为了解决简单工厂模式的缺点,我们通过接口IFactory抽象出工厂类,然后每次增加一个操作类,我就增加工厂类,

从而达到:对扩展开放,对修改关闭。

还是计算器的问题:

UML如下:

 

factory 基类:

public interface IOperatorFactory {    AbstractOperator CreateOperation();}

工厂类:

package com.jayfulmath.designpattern.factory;import com.jayfulmath.designpattern.samplefactory.operator.AbstractOperator;import com.jayfulmath.designpattern.samplefactory.operator.OperatorAdd;public class AddFactory implements IOperatorFactory {    @Override    public AbstractOperator CreateOperation() {        // TODO Auto-generated method stub        return new OperatorAdd();    }}
package com.jayfulmath.designpattern.factory;import com.jayfulmath.designpattern.samplefactory.operator.AbstractOperator;import com.jayfulmath.designpattern.samplefactory.operator.OperatorPlus;public class PlusFactory implements IOperatorFactory {    @Override    public AbstractOperator CreateOperation() {        // TODO Auto-generated method stub        return new OperatorPlus();    }}

main:

package com.jayfulmath.designpattern.factory;import com.jayfulmath.designpattern.main.BasicExample;import com.jayfulmath.designpattern.samplefactory.operator.AbstractOperator;public class FactoryMain extends BasicExample {    @Override    public void startDemo() {        // TODO Auto-generated method stub        IOperatorFactory addFactory = new AddFactory();        AbstractOperator addOperation = addFactory.CreateOperation();        addOperation.NumberA = 1;        addOperation.NumberB = 2;        System.out.println("[FactoryMain]"+addOperation.NumberA+" add "+addOperation.NumberB+" = "+addOperation.GetResult());        }}

工厂接口生成操作基类。

 

设计模式2---工厂模式