java - 泛型 - 如何返回 T 的 Map？

Question

class MyObject{}
class Human extends MyObject{}

public ConcurrentSkipListMap<String, <T extends MyObject>> get(Class<T> clazz, Object... vars){
    //...
}

//use the get() with
ConcurrentSkipListMap<String, Human> mapOfAllAdams = get(Human.class, "Adam");

但是返回值ConcurrentSkipListMap<String, <T extends MyObject>>给出编译错误，但是 <T extends MyObject>T没问题。我应该写什么？

Answer 1

进行这些更改

class MyObject{}
class Human extends MyObject{}

public <T extends MyObject> ConcurrentSkipListMap<String, T> get(Class<T> clazz, Object... vars){
    //...

    return null;
}

//use the get() with
void hello(){
    ConcurrentSkipListMap<String, Human> x = get(Human.class, "Adam");
}

我声明<T extends MyObject>在返回类型之前还添加了一个变量 x 来保存 get 的返回值功能。