Question

How can I say the following:

while(input is not an int){
do this
}

I tried this code but I know it’s wrong:

 int identificationnumber;
 Scanner sc3 = new Scanner(System.in);
identificationnumber = sc3.nextInt();

while( identificationnumber != int){ // this line is wrong 

Scanner sc4 = new Scanner(System.in);
identificationnumber = sc4.nextInt();

}

Any suggestions please.Thanks.

Answer 1

Javadocs are your friend: http://docs.oracle.com/javase/6/docs/api/java/util/Scanner.html

nextInt() throws an exception if the next token isn’t an int. You’re probably looking for hasNextInt()

Also, why are you creating a new Scanner every time you loop? (Or at all – you already have one before the loop)