public int testScanner () {
Scanner Scanner=new Scanner (System. In); 
While (true) {
Try {
Return scanner. NextInt (); 
} the catch (InputMismatchException e) {
e.printStackTrace(); 
} 
} 
} 

Going to implement a function is to make the user input number, if the input letters catch this exception to re-enter,
But does not enter again but actually the content of the popup exception handling has been...
To solve the