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A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where theold one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command: java-classpath /test
题目
A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where theold one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command: java-classpath /test:/home/bob/downloads/*.jar games.Chess Bob‘sCLASSPATH is set (at login time) to/usr/lib:/home/bob/classes:/opt/java/lib:/opt/java/lib/*.jarWhat is a possible location for the Chess.class file?（）
A./test/Chess.class
B./home/bob/Chess.class
C./test/games/Chess.class
D./usr/lib/games/Chess.class
E./home/bob/games/Chess.class
F.inside jarfile /opt/java/lib/Games.jar (with a correct manifest)
G. inside jarfile /home/bob/downloads/Games.jar (with a correct manifest)
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第1题：
下列Java标识符，错误的是 ( )
A．_sys_varl
B．$change
C．User_name
D．1_file
正确答案：D
解析：本题考查Java标识符的命名。属于考试重点内容，应该掌握。Java中标识符的命名规则是：标识符以字母、下划线、美元符作为首字符的字符串序列；标识符是区分大小写的；标识符的字符数没有限制。由此可见Java中标识符不能以数字开头，所以选项D是错误的。 -
第2题：
pageContext.setAttribute("user","tom");request.setAttribute("user","bob");显示"bob",则可以使用A.{request.getAttribute("user")}
B.{param.user}
C.{user}
D.{requestScope.user}
正确答案：D
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第3题：
AUNIXusernamedBobwantstoreplacehischessprogramwithanewone，butheisnotsurewheretheoldoneisinstalled.BobiscurrentlyabletorunaJavachessprogramstartingfromhishomedirectory/home/bobusingthecommand：java-classpath/test：/home/bob/downloads/*.jargames.ChessBob’sCLASSPATHisset（atlogintime）to：/usr/lib：/home/bob/classes：/opt/java/lib：/opt/java/lib/*.jarWhatisapossiblelocationfortheChess.classfile？（）
A./test/Chess.class
B./home/bob/Chess.class
C./test/games/Chess.class
D./usr/lib/games/Chess.class
E./home/bob/games/Chess.class
参考答案：C
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第4题：
request.setAttribute("user","svse");session.setAttribute("user","bob");使用{user}则显示A.null
B.svse
C.bob
D.啥也没有
正确答案：B
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第5题：
Which command allows you to view interface usage details in real－time?()A.user@host> debug interface interface-name
B.user@host> monitor usage interface-name
C.user@host> monitor interface interface-name
D.user@host> traceoptions interface interface-name
参考答案：C