chap7\calculate.jsp .....\HelloWorld.jsp .....\NumberGuess.jsp .....\sample\CaseTag.java .....\......\GreetingTag.java .....\......\RepeatTag.java .....\......\SimpleCalculator.java .....\......\SwitchTag.java .....\simpleJSTL.jsp .....\testTag.jsp .....\testTag.tld .....\sample chap7