java - Class 是否只有一个实例？

Question

是否 Class<SomeObject>只有一个实例是 SomeObject.class ？

这是一个函数

void f(Class<SomeObject> arg)

是否可以只传递 SomeObject.class否则编译时错误？

Answer 1

是的。

如 documentation 中所述:

Returns the runtime class of this Object. The returned Class object is the object that is locked by static synchronized methods of the represented class.

但是对于方法void f(Class<SomeObject> arg)你可以传递一些东西作为 void f(Class<? extends SomeObject> arg) .看this question .

传递 Class<? extends SomeObject arg你可以这样做:

myMethod(Class<? extends BasicObject> clazz)
{
    if (!clazz.isInstance(CodeObject))
    {
        (do something different)
    }
    ...
}