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ublic class Soundex {

/* Implements the mapping
* from: AEHIOUWYBFPVCGJKQSXZDTLMNR
* to: 00000000111122222222334556
*/
public static final char[] MAP = {
//A B C D E F G H I J K L M
'0','1','2','3','0','1','2','0','0','2','2','4','5',
//N O P W R S T U V W X Y Z'5','0','1','2','6','2','3','0','1','0','2','0','2'
};

/** Convert the given String to its Soundex code.
* @return null If the given string can't be mapped to Soundex.
*/
public static String soundex(String s) {

// Algorithm works on uppercase (mainframe era).
String t = s.toUpperCase();

StringBuffer res = new StringBuffer();
char c, prev = '?';

// Main loop: find up to 4 chars that map.for (int i=0; i<t.length() && res.length() < 4 &&
(c = t.charAt(i)) != ','; i++) {

// Check to see if the given character is alphabetic.
// Text is already converted to uppercase. Algorithm
// only handles ASCII letters, do NOT use Character.isLetter()!
// Also, skip double letters.
if (c>='A' && c<='Z' &&c != prev) {
prev = c;

// First char is installed unchanged, for sorting.
if (i==0)
res.append(c);
else {
char m = MAP[c-'A'];
if (m != '0')
res.append(m);
}
}
}
if (res.length() == 0)
return null;
for (int i=res.length(); i<4; i++)
res.append('0');
returnres.toString();
}
/** main */
public static void main(String[] args) {
String[] names = {
"Darwin, Ian",
"Davidson, Greg",
"Darwent, William",
"Derwin, Daemon"
};
for (int i = 0; i< names.length; i++)
System.out.println(Soundex.soundex(names[i]) + ' ' + names[i]);
}

}
ublic class Soundex {

/* Implements the mapping
* from:AEHIOUWYBFPVCGJKQSXZDTLMNR
* to: 00000000111122222222334556
*/
public static final char[] MAP = {
//A B C D E F G H I J K L M
'0','1','2','3','0','1','2','0','0','2','2','4','5',
//N O P W R S T U V W X Y Z
'5','0','1','2','6','2','3','0','1','0','2','0','2'
};

/** Convert the given String to its Soundex code.* @return null If the given string can't be mapped to Soundex.
*/
public static String soundex(String s) {

// Algorithm works on uppercase (mainframe era).
String t = s.toUpperCase();

StringBuffer res = new StringBuffer();
char c, prev = '?';

// Main loop: find up to 4 chars that map.
for (int i=0; i<t.length() && res.length() < 4&&
(c = t.charAt(i)) != ','; i++) {

// Check to see if the given character is alphabetic.
// Text is already converted to uppercase. Algorithm
// only handles ASCII letters, do NOT use Character.isLetter()!
// Also, skip double letters.
if (c>='A' && c<='Z' && c != prev) {
prev = c;

// First char is installedunchanged, for sorting.
if (i==0)
res.append(c);
else {
char m = MAP[c-'A'];
if (m != '0')
res.append(m);
}
}
}
if (res.length() == 0)
return null;
for (int i=res.length(); i<4; i++)
res.append('0');
return res.toString();
}
/** main */
public static void main(String[] args) {String[] names = {
"Darwin, Ian",
"Davidson, Greg",
"Darwent, William",
"Derwin, Daemon"
};
for (int i = 0; i< names.length; i++)
System.out.println(Soundex.soundex(names[i]) + ' ' + names[i]);
}

}
ublic class Soundex {

/* Implements the mapping
* from: AEHIOUWYBFPVCGJKQSXZDTLMNR
* to: 00000000111122222222334556
*/...