Java通用类作为参数

Question

I have a basic question regarding Java generics. I have a method that takes this as an argument:

public id findKey(List<String> ids, CustomClass clazz) {
    repos.findID(ids, clazz);
}

I then want to use a java generic class as an argument for another method:

repos.findID(ids, clazz);

but my findID method needs a java generic class instead of clazz. How do I get my clazz argument from the findkey parameter and turn it to a generic class? If I do this:

public id findKey(List<String> ids, Class<T> clazz) {
    repos.findID(ids, clazz);
}    

I get an error because it won't recognize my T.

I'm at loss at how this stuff works and would appreciate any help.

Edit: Solved it. I can use ? or explicitly state a class type that I wanted and it accepted it.

Answer 1

There are two options:

• define your type as unknown

   public id findKey(List<String> ids, Class<?> clazz) 

• define a type variable

   public <T> id findKey(List<String> ids, Class<T> clazz) 

Answer 2

使用public id findKey(List<String> ids, Class<?> clazz)并了解有关通配符的更多信息