My question is why don't enter into if when acc.getUsername equals "stringExample"? When I print acc.getUsername() this line ealier it shows its equals but dont go into if, why?
@RequestMapping(value = "/login", method = RequestMethod.POST)
    public ModelAndView checker(@ModelAttribute(value="acc") Account acc) {
        System.out.println(acc.getUsername());
        if(acc.getUsername() == "stringExample"){
            System.out.println("aaa");
        }
        ModelAndView model2 = new ModelAndView("index.jsp");
        return model2;
    }
 
     
    