I have applied a check for not allowing alphabets.But its not working

import java.util.开发者_高级运维Scanner;

public class Main extends Hashmap{

    public static void main(String[] args) {
        Hashmap hm = new Hashmap();
        int x=0;
        Scanner input = new Scanner(System.in);
        do{
            System.out.print("Enter any integer value between 1 to 12: ");
            x = input.nextInt();
        }while(x<=0 || x>12);
        Scanner sc = new Scanner(System.in);
        //int number;


       do {
           while (!sc.hasNextInt())
           {
            System.out.println("That's not a number!");
            sc.next();
           }
            x = sc.nextInt();
           }while(x>=0);

        String month = hm.getEntry(x);
        System.out.println(month);




}
    }

here I need to restrict user from entering an alphabet.But its not working. pls help...

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public static void main(String[] args) {
    HashMap<Integer, String> hm = new HashMap<Integer, String>();
    /**
     * Populate hashmap.. Your logic goes here
     */
    Scanner sc = new Scanner(System.in);
    int x;
    System.out.println("Enter a number between 1 and 12");
    do {
        while (!sc.hasNextInt()) {
            System.out.println("That's not a number! Enter a number between 1 and 12");
            sc.next();
        }
        x = sc.nextInt();
        String month = hm.get(x);
        System.out.println("The corresponding month is " + month);
    } while (x >= 0);

}

I think this is what you are trying to achieve..

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First, have a look at polygenelubricants comprehensive answer to your problem again. I'm pretty sure, he solved it for you in Example 3.

Then, as an alternative design for a user interface: accept any user input, validate the input and if the input is not correct, provide a helpful message and ask the user to enter a value again. This is much, much easier to implement and a user should be happy with this too.