More Conditionals and Loops - Java Software Solutions: Foundations of Program Design - page 272

Note also that the implicit boolean condition of a switch statement is based
on equality. The expression at the beginning of the statement is compared to each
case value to determine which one it equals. A switch statement cannot be used to
determine other relational operations (such as less than), unless some preliminary
processing is done. For example, the GradeReport program in Listing 6.1 prints a
comment based on a numeric grade that is entered by the user.
LISTING 6.1
//********************************************************************
// GradeReport.java Author: Lewis/Loftus
//
// Demonstrates the use of a switch statement.
//********************************************************************
import java.util.Scanner;
public class GradeReport
{
//-----------------------------------------------------------------
// Reads a grade from the user and prints comments accordingly.
//-----------------------------------------------------------------
public static void main (String[] args)
{
int grade, category;
Scanner scan = new Scanner (System.in);
System.out.print ("Enter a numeric grade (0 to 100): ");
grade = scan.nextInt();
category = grade / 10;
System.out.print ("That grade is ");
switch (category)
{
case 10:
System.out.println ("a perfect score. Well done.");
break ;
case 9:
System.out.println ("well above average. Excellent.");
break ;
case 8:
System.out.println ("above average. Nice job.");
break ;