HANDLING EXCEPTIONS AND EVENTS - Java Programming: From Problem Analysis to Program Design - page 739

The methods nextInt and nextDouble both throw an InputMismatchException if the
input is invalid. The class InputMismatchException is a subclass of the class
NoSuchElementException , which is a subclass of the class RuntimeException .The
class InputMismatchException has only two constructors, as described in Table 11-6.

TABLE 11-6 class InputMismatchException and its Constructors

public InputMismatchException()
//Default constructor
//Creates a new instance of the class InputMismatchException.
//The error message is null.

public InputMismatchException(String str)
//Constructor with parameters
//Creates a new instance of the class InputMismatchException. The
//parameter str specifies the message string that is to be retrieved
//by the method getMessage.

Tables 11-7 and 11-8 show the exceptions thrown by the methods next and nextLine
of the class Scanner .

TABLE 11-7 Exceptions Thrown by the Method next

Exception Thrown Description

NoSuchElementException If there is no more input (tokens)

IllegalStateException

If this scanner is closed

TABLE 11-8 Exceptions Thrown by the Method nextLine

1
1

Exception Thrown Description

NoSuchElementException

If the input is exhausted

IllegalStateException If this scanner is closed

In an end-of-file (EOF)-controlled while loop, we use the method hasNext of the
class Scanner to determine whether there is a token in the input stream. Table 11-9
shows the exception thrown by the method hasNext .

TABLE 11-9 Exceptions Thrown by the Method hasNext

Exception Thrown Description

IllegalStateException

If this scanner is closed