why parameter.getType().isInstance(HttpServletRequest.class) return is false,but use "==" is true

Question

Parameter[] ps = method.getParameters();

Map<String,Integer> map = new HashMap<String,Integer>();

for(int ij = 0;ij<ps.length;ij++){

    Parameter p = ps[ij];

    RequestParam rp = p.getAnnotation(RequestParam.class);

    if(rp != null){

        //do something

    }else {
        System.out.println(p.getType());
        System.out.println(p.getType().isInstance(HttpServletRequest.class));
        System.out.println(p.getType() == HttpServletRequest.class);
    }
}

the output is:

interface javax.servlet.http.HttpServletRequest
false
true

why use the "isInstance" is false and use "==" is true? because the "instance of" can't judge implements relationship?

Answer 1

The type isn't an instance of the HttpServletRequest class, it's an instance of java.lang.Class that contains the information about the HttpServletRequest class.