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Create a hasNext within a do-while block

The main idea is to avoid exceptions by using either hasNext or the default option of the switch clause.

I know the easiest way to handle exceptions is using a try-catch block though do not what to use it.

When getting input from the user. it's supposed to type a number. Using the hasNextByte method would be:

System.out.print ("Type a byte: ");

if (scanner.hasNextByte()) {
    System.out.println ("You've typed a byte");

else {

    System.out.println ("Ain't a byte");


Now I wonder how to add this clause in a do-while block.

ANy help'd be fantastic !!

Thank y'all !!!!!