How can I make a program get a variable inside a loop? (java) -

i making program asking age isn't working. first asks how old are, scanner module , puts age inside variable. want output @ end age, needs int, if put string or else gives error:

exception in thread "main" java.util.inputmismatchexception @ java.util.scanner.throwfor(unknown source) @ java.util.scanner.next(unknown source) @ java.util.scanner.nextint(unknown source) @ java.util.scanner.nextint(unknown source) @ org.asking.age.main(asking.java:18) 

i want let him instead of error): please enter number between 1 , 100, if enter else number between 1-100. , if put in wrong number has 'restart', , if number has end.

i tried loop:

(i = age scanner)

while(i>100 || i>0)         {             if (a < 100 || > 0) {                  system.out.println("please enter number between 1 , 100");                 system.out.println("how old you?");                 scanner s = new scanner(system.in);                 int = s.nextint();          { system.out.println("you " + + "years old")      }}}}} 

but @ beginning 'if' cant reach variable. there exist another/any way this?

thanks helping, , sorry bad english :)

thanks @thelostmind helping got code :

but dont understand how use if(>0 && <100, , matches isn't working

public static void main(string[] args)  {     system.out.println("how old you?");      scanner h = new scanner(system.in);     string a= h.nextline();      string str = a;      string matches=("\\d+");      integer.parseint(a);        { {      system.out.println("please enter number between 1 , 100");    system.out.println("how old you?");    h.nextline();  } while(a>0 && a<100); } } } 

first of all, start decalring both scanner , int a outside loop.

next, use scanner#nextline() read entire line of input string.

then use string#matches("\\d+") , integer.parseint(inputstring) parse int number.

then use if(>0 && <100) check.

there methods in scanner class (hasnextint()) wait int, that's not looking for.