How to accept input if user enters int or double/float?

        Scanner input = new Scanner (System.in);        

        float n1;
        float n2;
        float n3;
        float n4;
        float sum = 0; 
        float product = 0;
        float difference = 0;
        float quotient = 0;
        float answer = 0;

        String name;
        String kind;

        System.out.println("Hi, what is your name?:  ");
        name = input.nextLine();

        System.out.printf("Hi there %s! What kind of math do you want to try today?\n (+,-,*,/):  ", name);
        kind = input.nextLine();



        System.out.printf("OK %s, give me your first number:  \n", name);
        n1 = input.nextFloat();   /*<--- can I put input.nextInt(); and 
                                  input.nextFloat(); in an if statement?
                                  Iv'e tried things like this --->
                                  if (input.nextInt() || input.nextFloat()) {
                                  } */ 


        System.out.printf("Now what is the second number:  \n");
        n2 = input.nextFloat();

        System.out.println("Nice, one moment please...\n");

          sum = (float) n1 + n2;
          difference = (float) n1 - n2;
          product = (float) n1 * n2;
          quotient = (float)n1 / n2;

        if (kind.equals("+")){
            answer = sum;
            System.out.printf("After some digging, I found that\nthe answer to your problem:"
                    + " %.2f %s %.2f ... is %.2f", n1, kind, n2, answer );
        }
        if (kind.equals("-")){
            answer = difference;
            System.out.printf("After some digging, I found that\nthe answer to your problem:"
                    + " %.2f %s %.2f ... is %.2f", n1, kind, n2, answer );
        }
        if (kind.equals("*")){
            answer = product;
            System.out.printf("After some digging, I found that\nthe answer to your problem:"
                    + " %.2f %s %.2f ... is %.2f", n1, kind, n2, answer );
        }
        if (kind.equals("/")){
            answer = quotient;
            System.out.printf("After some digging, I found that\nthe answer to your problem:"
                    + " %.2f %s %.2f ... is %.2f", n1, kind, n2, answer );
        }