工厂模式

实战

待优化业务逻辑代码

/** * @author sunyang * @date 2019/1/30 10:32 */public class BizUser {    public String getShowMoreNum(Long showNumRedis) {        String  result= String.valueOf(showNumRedis);        if (showNumRedis >= 10 && showNumRedis <= 99){            String code = String.valueOf(showNumRedis);            String first = code.substring(0, 1);            result = first + "0+";        }else if (showNumRedis >= 100 && showNumRedis <=999){            String code = String.valueOf(showNumRedis);            String first = code.substring(0, 1);            result = first + "00+";        }else if (showNumRedis >= 1000 && showNumRedis <=9999){            String code = String.valueOf(showNumRedis);            String first = code.substring(0, 1);            result = first + "000+";        }else if (showNumRedis > 9999){            result = "9999+";        }else{            result= String.valueOf(showNumRedis);        }        return result;    }}

分析

从代码看的出来，不同条件下，执行的逻辑是不同的，可以把这种执行逻辑抽象出来，用多态的概念来定义不同的执行方式。

/** * 工厂模式 * 从代码看的出来，不同的条件下，执行的逻辑是不同的，那么可以把这种执行逻辑抽象出来 * 用多态的概念来定义不同的执行方式 * * @author sunyang * @date 2019/1/30 10:51 */public abstract class AbstractBizUser2 {    /**     * 处理展示     * @param showNumRedis 展示数量     * @return     */    public abstract String process(Long showNumRedis);}

/** * @author sunyang * @date 2019/1/30 10:57 */public class ShowOneExecutor extends AbstractBizUser2{    @Override    public String process(Long showNumRedis) {        String result;        String code = String.valueOf(showNumRedis);        String first = code.substring(0, 1);        result = first + "0+";        return result;    }}

/** * @author sunyang * @date 2019/1/30 11:07 */public class ShowTwoExecutor extends AbstractBizUser2 {    @Override    public String process(Long showNumRedis) {        String result;        String code = String.valueOf(showNumRedis);        String first = code.substring(0, 1);        result = first + "00+";        return result;    }}

/** * @author sunyang * @date 2019/1/30 11:09 */public class ShowThreeExecutor extends AbstractBizUser2 {    @Override    public String process(Long showNumRedis) {        String result;        String code = String.valueOf(showNumRedis);        String first = code.substring(0, 1);        result = first + "000+";        return result;    }}

/** * @author sunyang * @date 2019/1/30 11:09 */public class ShowFourExecutor extends AbstractBizUser2 {    @Override    public String process(Long showNumRedis) {        String result;        result = "9999+";        return result;    }}

/** * @author sunyang * @date 2019/1/30 11:10 */public class ShowOtherExecutor extends AbstractBizUser2 {    @Override    public String process(Long showNumRedis) {        String result;        result= String.valueOf(showNumRedis);        return result;    }}

/** * 定义一个工厂来把需要处理逻辑给包起来 * * @author sunyang * @date 2019/1/30 11:21 */public class ExecutorFactory {    public AbstractBizUser2 getExecutor(Long showNumRedis){        if (showNumRedis >= 10 && showNumRedis <= 99){            return new ShowOneExecutor();        }else if (showNumRedis >= 100 && showNumRedis <=999){            return new ShowTwoExecutor();        }else if (showNumRedis >= 1000 && showNumRedis <=9999){            return new ShowThreeExecutor();        }else if (showNumRedis > 9999){            return new ShowFourExecutor();        }else{            return new ShowOtherExecutor();        }    }}

结论

/** * @author sunyang * @date 2019/1/30 10:32 */public class BizUser {    public String getShowMoreNum(Long showNumRedis) {        /*String  result= String.valueOf(showNumRedis);        if (showNumRedis >= 10 && showNumRedis <= 99){            String code = String.valueOf(showNumRedis);            String first = code.substring(0, 1);            result = first + "0+";        }else if (showNumRedis >= 100 && showNumRedis <=999){            String code = String.valueOf(showNumRedis);            String first = code.substring(0, 1);            result = first + "00+";        }else if (showNumRedis >= 1000 && showNumRedis <=9999){            String code = String.valueOf(showNumRedis);            String first = code.substring(0, 1);            result = first + "000+";        }else if (showNumRedis > 9999){            result = "9999+";        }else{            result= String.valueOf(showNumRedis);        }        return result;*/        ExecutorFactory executorFactory = new ExecutorFactory();        AbstractBizUser2 bizUser2 = executorFactory.getExecutor(showNumRedis);        return bizUser2.process(showNumRedis);    }}

/** * @author sunyang * @date 2019/1/30 12:32 */public class BizUserDemo {    public static void main(String[] args) {        long showNum = 1111;        BizUser bizUser = new BizUser();        String result = bizUser.getShowMoreNum(showNum);        System.out.println("工厂模式实战后的结果 result：" + result);    }}