一、UML

工廠方法模式.png

二、基本步驟

2.1、工廠基本抽象類實(shí)現(xiàn)

2.2、產(chǎn)品基本抽象類實(shí)現(xiàn)

2.3、工廠業(yè)務(wù)實(shí)現(xiàn)

2.4、產(chǎn)品業(yè)務(wù)實(shí)現(xiàn)

2.5、工廠創(chuàng)建產(chǎn)品

三、實(shí)現(xiàn)方式

3.1、定義

抽象工廠類

/**
 * @author lizihanglove
 * @date 2018/1/15
 * @email one_mighty@163.com
 * @desc 工廠方法設(shè)計(jì)模式
 */

public abstract class Factory {

    public abstract <T extends Product> T createProduct(Class<T> product);
}

具體工廠方法類

/**
 * @author lizihanglove
 * @date 2018/1/15
 * @email one_mighty@163.com
 * @desc 具體工廠方法類
 */

public class ConcreteFactory extends Factory {
    @Override
    public <T extends Product> T createProduct(Class<T> product) {
        T newInstance = null;
        try {
            newInstance = product.newInstance();
            return newInstance;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

產(chǎn)品抽象類

/**
 * @author lizihanglove
 * @date 2018/1/15
 * @email one_mighty@163.com
 * @desc 產(chǎn)品抽象類
 */

public abstract class Product {

    public abstract void print();
}

具體產(chǎn)品類A

/**
 * @author lizihanglove
 * @date 2018/1/15
 * @email one_mighty@163.com
 * @desc 具體產(chǎn)品類A
 */

public class ProductA extends Product {
    @Override
    public void print() {
        System.out.println(this.getClass().getCanonicalName());
    }
}

具體產(chǎn)品類B

/**
 * @author lizihanglove
 * @date 2018/1/15
 * @email one_mighty@163.com
 * @desc 具體產(chǎn)品類B
 */

public class ProductB extends Product {
    @Override
    public void print() {
        System.out.println(this.getClass().getCanonicalName());
    }
}

3.2、調(diào)用

ConcreteFactory factory = new ConcreteFactory();
ProductA productA = factory.createProduct(ProductA.class);
productA.print();
ProductB productB = factory.createProduct(ProductB.class);
productB.print();

3.3、結(jié)果

System.out:website.lizihanglove.designpattern.patterns.java.factory.ProductA
System.out:website.lizihanglove.designpattern.patterns.java.factory.ProductB