Can we give class name as null in java?

Another basic but tricky question asked in interviews these days.

Can we give class name as null in java? 

class null{} //error

class Null{} //Fine

Can we give instance variable name as null in java? 

public class nullTrueFalse_asClassVarName {
    public static void main(String[] args) {
          int null//error     

Read :

Super keyword in java - Invoke constructor, Access instance variable, Invoke instance method of immediate super class using super

this keyword in java - in constructor, refer instance variable, call instance method, this (current class object) as a parameter, return this

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