java - 什么是 java.lang.Class[]

Question

什么是 java.lang.Class<?>[]在 java 。具体是什么<?> .

我是java初学者，我不明白<?>是什么意思

谢谢，

普尼特

Answer 1

A type argument for a parameterized type is not limited to a concrete class or interface. Java allows the use of type wildcards to serve as type arguments for parameterized types. Wildcards are type arguments in the form "?", possibly with an upper or lower bound. Given that the exact type represented by a wildcard is unknown, restrictions are placed on the type of methods that may be called on object of the parameterized type.

来源: Generics In Java
还: Wildcards in Generics