Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 12E
Modify the LogAnalyzer class so that it has a constructor that can take the name of the log file to be analyzed. Have this constructor pass the file name to the constructor of the LogfileReader class. Use the LogfileCreator class to create your own file of random log entries, and analyze the data.
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Activity No.
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Time (weeks)
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1
Requirements collection
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Requirements structuring
4
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3
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2
4
Data analysis
3
2
5
Logical design
50
3,4
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Physical design
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5
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c. Using the information from part b, prepare a network diagram. Identify the critical path.
Given the following Extended-BNF grammar of the basic mathematical expressions:
Show the derivation steps for the expression: ( 2 + 3 ) * 6 – 20 / ( 3 + 1 )
Draw the parsing tree of this expression.
SEE IMAGE
Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
Chapter 7 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 7 - Prob. 1ECh. 7 - Prob. 2ECh. 7 - Read through the LogAnalyzer class and identify...Ch. 7 - Modify the LogAnalyzer class so that it has a...Ch. 7 - Prob. 14ECh. 7 - Add a method busiestHour to LogAnalyzer that...Ch. 7 - Add a method quietestHour to LogAnalyzer that...Ch. 7 - Prob. 18ECh. 7 - Prob. 34E
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