boolean badNumber;
Scanner sc = new Scanner(System.in);
do{
  System.out.print("Please print your number: ");
  try{
    int i = sc.nextInt(); 
    System.out.println("Your Number is: " + i);
    badNumber = false;
  }
  catch(Exception e){
    System.out.println("Bad number");
    sc.next();
    badNumber = true
  }
}while(badNumber);