
EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
6th Edition
ISBN: 8220102010314
Author: Horstmann
Publisher: YUZU
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Question
Chapter 21, Problem 8PP
Program Plan Intro
To decrypt a file that was encrypted using monoalphabet cipher
Program plan:
- In the file “CaesarCipher.java”, import necessary packages and create a class “CaesarCipher”,
- Declare a variable.
- Define the constructor to initialize the value.
- Define the method “decryptStream()” to decrypt the contents of a stream and reports how many words are found,
- Execute “try” statement to check if exception occurs.
- Find the number of words found.
- Catch if exception occurs,
- Handle the exception.
- Define the method “decrypt()” to decrypt a value.
- In the file “FrequencyMap.java”, create a class “FrequencyMap” to count the frequency of letters,
- Declare the array and variable.
- Define the constructor to initialize the variable.
- Define the method “getFrequency()” to get the frequency of the specified letter.
- Define the method “add()” to add a letter to be counted.
- In the file “Decryptor.java”, import necessary packages and create a class “Decryptor”,
- Define the method “main()”,
- Initialize the necessary variables.
- Execute “while” loop till the length of the argument,
- Check, if the input file is null,
- Get the input file.
-
- Increment count.
- Check, if the input file is null,
- Execute “try” statement,
- Create an object for “FrequencyMap”.
- Execute till not done,
- Assign the character.
- Check if “-1”.
-
- Set the Boolean value to true.
- Otherwise, check if there is a letter.
-
- Call the method “add()” to add a letter to be counted.
- Close the reader.
- Execute a loop.
- Print the frequencies.
- Catch if exception occurs,
- Print the stack trace.
- Execute another “try” statement,
- Brute force the decryption with the Caesar cipher and output the number of words from the dictionary file found for each key.
- Create an object for “CaesarCipher”.
-
-
- Close the input stream.
-
- Brute force the decryption with the Caesar cipher and output the number of words from the dictionary file found for each key.
- Catch if exception occurs,
- Handle the exception.
- Define the method “main()”,
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Chapter 21 Solutions
EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
Ch. 21.1 - Prob. 1SCCh. 21.1 - Prob. 2SCCh. 21.2 - Prob. 3SCCh. 21.2 - Prob. 4SCCh. 21.2 - Prob. 5SCCh. 21.3 - Prob. 6SCCh. 21.3 - Prob. 7SCCh. 21.4 - Prob. 8SCCh. 21.4 - Prob. 9SCCh. 21.5 - Prob. 10SC
Ch. 21.5 - Prob. 11SCCh. 21.5 - Prob. 12SCCh. 21.5 - Prob. 13SCCh. 21.5 - Prob. 14SCCh. 21 - Prob. 1RECh. 21 - Prob. 2RECh. 21 - Prob. 3RECh. 21 - Prob. 4RECh. 21 - Prob. 5RECh. 21 - Prob. 6RECh. 21 - Prob. 7RECh. 21 - Prob. 8RECh. 21 - Prob. 9RECh. 21 - Prob. 10RECh. 21 - Prob. 11RECh. 21 - Prob. 12RECh. 21 - Prob. 13RECh. 21 - Prob. 14RECh. 21 - Prob. 15RECh. 21 - Prob. 16RECh. 21 - Prob. 1PECh. 21 - Prob. 2PECh. 21 - Prob. 3PECh. 21 - Prob. 4PECh. 21 - Prob. 5PECh. 21 - Prob. 6PECh. 21 - Prob. 7PECh. 21 - Prob. 8PECh. 21 - Prob. 9PECh. 21 - Prob. 10PECh. 21 - Prob. 1PPCh. 21 - Prob. 2PPCh. 21 - Prob. 3PPCh. 21 - Prob. 4PPCh. 21 - Prob. 5PPCh. 21 - Prob. 6PPCh. 21 - Prob. 7PPCh. 21 - Prob. 8PPCh. 21 - Prob. 9PPCh. 21 - Prob. 10PPCh. 21 - Prob. 11PPCh. 21 - Prob. 12PPCh. 21 - Prob. 13PPCh. 21 - Prob. 14PP
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