Imcompatible type error.

    public String getResult(){
        String s2 = JOptionPane.showMessageDialog(null," is higher than Magic Number");
        return s2;
    } 

I am trying to return the String value to getResult() method, but it doesn't work.

The Imcompatible type error keeps occurring. It states that the return value is void, but didn't I return variable s2 which is a String variable ?