小编Too*_*ofy的帖子

似乎网络上到处都有人们自动装配实现类 RestTemplate 而不是它的接口 RestOperations 的例子。即使在 Spring 手册和文档中，接口也被称为“不经常使用”。像这里https://spring.io/guides/gs/sumption-rest/这样的官方指南有以下示例：

@Bean 
public RestTemplate restTemplate(RestTemplateBuilder builder) {
    return builder.build();
}

然后将它们注入到类中

@Autowired 
public SomeClass(RestTemplate rt) {
    this.rt = rt;
}

我一直认为在具体实现中接线是不好的做法。为什么这里的实现在 spring 文档和更广泛的网络中如此普遍？

我有两个类,Character和Npc,它们都继承自一个名为'Actor'的基类.考虑以下两种基本相同的方法:

public static Dictionary<uint, Npc> drawnNpcs = new Dictionary<uint, Npc>();
public static Dictionary<uint, Character> drawnCharacters = new Dictionary<uint, Character>();

private GameObject DrawCharacter(ActorWrapper actorToDraw)
{
    GameObject obj;
    if (Data.drawnCharacters.ContainsKey(actorToDraw.Id))
    {
        Character character;
        Data.drawnCharacters.TryGetValue(actorToDraw.Id, out character);
        obj = character.gameObject;
        obj.SetActive(true);
    }
    else
    {
        obj = new GameObject("Actor");
        Character character = obj.AddComponent<Character>();
        character.Id = actorToDraw.Id;
        Data.drawnCharacters.Add(character.Id, character);
    }
    return obj;
}

private GameObject DrawNpc(ActorWrapper actorToDraw)
{
    GameObject obj;
    if (Data.drawnNpcs.ContainsKey(actorToDraw.Id))
    {
        Npc npc;
        Data.drawnNpcs.TryGetValue(actorToDraw.Id, out npc);
        obj = npc.gameObject;
        obj.SetActive(true);
    }
    else
    { …