java - How to check type of variable in Exception? -

i created own exception in program show error

class invalidtypeexception extends exception {     invalidtypeexception(string s) {         super(s);     } } public class customexception1 {      static void valid(int a) throws invalidtypeexception {         if (a instanceof integer) throw new invalidtypeexception("valid");         else system.out.println("invalid");     }      public static void main(string args[]) {         try {             valid(12);         } catch (exception e) {             system.out.println(e);         }     }  } 

the compilation error is:

src\customexception1.java:11: error: unexpected type   if(a instanceof integer )      ^   required: reference   found:    int 1 error 

you can't use instanceof operator on primitive types, a defined. define argument type object:

static void valid(object o) throws invalidtypeexception {     if (o instanceof integer) {          throw new invalidtypeexception("valid");     } else {         system.out.println("invalid");     } }