通达信日线行情接口:使用函数式接口解决if else代码

新增不同动物叫声的适配器AnimalCallCryService

package com.example.jvm.demo.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;

/**
 * 不同动物叫声的适配器
 *
 * @author fangxc
 * @version V1.0.0
 * @date 2022/2/10 14:28
 */
@Service
public class AnimalCallCryService {

    @Autowired
    private AnimalTypeCryService animalTypeCryService;

    private Map> animalTypeServiceMap = new ConcurrentHashMap<>();

    @PostConstruct
    private void animalCallInit() {
        animalTypeServiceMap.put('dog', animalType -> animalTypeCryService.dogCry(animalType));
        animalTypeServiceMap.put('cat', animalType -> animalTypeCryService.catCry(animalType));
    }

    public String getResult(String animalType) {
        Function result = animalTypeServiceMap.get(animalType);
        if (result != null) {
            return result.apply(animalType);
        }
        return '没有匹配的动物叫声！';
    }
}

新增一个不同动物的叫声统一实现类AnimalTypeCryService

package com.example.jvm.demo.service.impl;

import org.springframework.stereotype.Service;

/**
 * 不同动物的叫声统一实现类
 *
 * @author fangxc
 * @version V1.0.0
 * @date 2022/2/10 14:25
 */
@Service
public class AnimalTypeCryService {

    public String dogCry(String animalType) {
        return '狗汪汪叫！';
    }

    public String catCry(String animalType) {
        return '猫喵喵叫！';
    }
}

新增单元测试，查看效果

    @Autowired
    private AnimalCallCryService animalCallCryService;

    @Test
    public void animalAdaptTest2() throws Exception {
        System.out.println(animalCallCryService.getResult('dog'));
        System.out.println(animalCallCryService.getResult('cat'));
        System.out.println(animalCallCryService.getResult('test'));
    }

使用函数式接口解决if else代码

用这种方式，我个人建议是把同一类行为进行统一封装，而不是像策略模式那样对同一类对象进行封装。

本篇结合下Java8的函数式接口，换一种思路实现类似的效果

文章为作者独立观点，不代表股票交易接口观点