parseint - Java input/output confusion -

i writing program , need input value index, index should composite, e.g 44gh. question is, how make program not crash when ask user input , want display it?

i have been looking answer in site, integer or string type. if can help, appreciated.

         scanner s input = new scanner(system.in);     private arraylist<product> productlist;      system.out.println("enter product");     string product = s.nextline();      system.out.println("input code product e.g f7pp");     string code = s.nextline(); } public void deleteproduct(){    system.out.println("enter code of product want delete ");     string removed = input.nextline();             if (productlist.isempty()) {             system.out.println("there no products removing");        }  else {     string astring = input.next();      productlist.remove(astring); } } 

remove non digits char before casting integer:

string numbersonly= astring.replaceall("[^0-9]", ""); integer result = integer.parseint(numbersonly);