java8 Function 应用场景

java8 Function 应用场景 –代码重构

旧代码：

import org.springframework.beans.BeanUtils;

import java.util.function.Function;

public class J8FunctionDemo1Test {

    public static void main(String[] args) {
        CarVO byCompany = getCarByCompany("长城");
        CarVO carByName = getCarByName("长安CS75");
    }
    /**
     * 旧代码
     */
    public static CarVO creteByName(String name){
        Car car= new Car().setName(name).setCompany("长安");
        CarVO vo=new CarVO();
        BeanUtils.copyProperties(car,vo);
        vo.setAddress("重庆");
        vo.setStatus(0);
        return vo;
    }
    /**
     * 旧代码
     */
    public static CarVO createByCompany(String company){
        Car car=  new Car().setName("长城H6").setCompany(company);
        car.setStatus(0);
        CarVO vo=new CarVO();
        BeanUtils.copyProperties(car,vo);
        vo.setAddress("北京");
        vo.setStatus(0);
        return vo;
    }
}

使用Function 函数重构代码：

import org.springframework.beans.BeanUtils;

import java.util.function.Function;

public class J8FunctionDemo1Test {

    public static void main(String[] args) {
        Car byCompany = getCarByCompanyFn("长城");
        Car carByName = getCarByNameFn("长安CS75");
    }

    /**
     * 新function代码
     */
    public static CarVO createByFunction(String param,Function<String,CarVO> function){
        Car car= function.apply(param);
        CarVO vo=new CarVO();
        BeanUtils.copyProperties(car,vo);
        vo.setAddress("北京");
        vo.setStatus(0);
        return vo;
    }
    /**
     * 新function代码
     */
    public static CarVO getCarByNameFn(String name){
        return createByFunction(name,arg->creteByName(name));
    }
    /**
     * 新function代码
     */
    public static CarVO getCarByCompanyFn(String company){
        return createByFunction(company,arg->createByCompany(company));
    }

}

可以看到使用function代码更简约