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This class defines the methods code and decode. The method encode takes a String parameter and returns a String result. It takes each character of the parameter and performs a Caesar shift on the character. That is, the a shift with possible wrap around can be coded as follows:

char ch = word.charAt(i);

ch = (char)(?a' + ch ? ?a' + 3) % 26);

The method decode does the reverse...

That is, the a shift with possible wrap around can be coded as follows:

char ch = word.charAt(i);

ch = (char)(?a' + ch ? ?a' + 3) % 26);

The method decode does the reverse. Listing 2 shows a partial definition of this class - Caesar

public class Caeser extends Cipher

{

public Caeser(String s)

{

super(s);

}

public String encode(String word)

{

StringBuffer result = new StringBuffer();

for (int i = 0; i < word...

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