String replace()

[- ions]

Hi, i would like to know how to replace every char in a string with a
certin given char using the String.replace( char oldChar,char newChar).
I would like to replace all letters with an underscore ie. "hello
world" will be come...
"_ _ _ _ _ _ _ _ _ _" (ive added xtra spaces so it dosnt look like
one line!) with the method i have written only the last char is
replaced, loop problem i guess!

public String hideWord(String word)
{
String alphabet = "ABCDEFGHIJKLMN OPQRSTUVWXYZ";
String hiddenWord="";

for(int i = 0;i<word.length ();i++)
{
char temp = word.charAt(i);

for(int j=0;j<alphabet. length();j++)
{
char letters = alphabet.charAt (j);

if(temp == letters)
{
hiddenWord = word.replace(te mp,'_');
}
}
}
return hiddenWord;
}

Any help much appreciated! Thanks :)

[hiwa]

ne************* @hotmail.com (- ions) wrote in message news:<47******* *************** ****@posting.go ogle.com>...

Hi, i would like to know how to replace every char in a string with a
certin given char using the String.replace( char oldChar,char newChar).
I would like to replace all letters with an underscore ie. "hello
world" will be come...
"_ _ _ _ _ _ _ _ _ _" (ive added xtra spaces so it dosnt look like
one line!) with the method i have written only the last char is
replaced, loop problem i guess!

public String hideWord(String word)
{
String alphabet = "ABCDEFGHIJKLMN OPQRSTUVWXYZ";
String hiddenWord="";

for(int i = 0;i<word.length ();i++)
{
char temp = word.charAt(i);

for(int j=0;j<alphabet. length();j++)
{
char letters = alphabet.charAt (j);

if(temp == letters)
{
hiddenWord = word.replace(te mp,'_');
}
}
}
return hiddenWord;
}

Any help much appreciated! Thanks :)

word.replaceAll("[^ ]", "_"); //preserve spaces
 

[Gregory A. Swarthout]

ne************* @hotmail.com (- ions) wrote in message news:<47******* *************** ****@posting.go ogle.com>...

Hi, i would like to know how to replace every char in a string with a
certin given char using the String.replace( char oldChar,char newChar).
I would like to replace all letters with an underscore ie. "hello
world" will be come...
"_ _ _ _ _ _ _ _ _ _" (ive added xtra spaces so it dosnt look like
one line!) with the method i have written only the last char is
replaced, loop problem i guess!

public String hideWord(String word)
{
String alphabet = "ABCDEFGHIJKLMN OPQRSTUVWXYZ";
String hiddenWord="";

for(int i = 0;i<word.length ();i++)
{
char temp = word.charAt(i);

for(int j=0;j<alphabet. length();j++)
{
char letters = alphabet.charAt (j);

if(temp == letters)
{
hiddenWord = word.replace(te mp,'_');
}
}
}
return hiddenWord;
}

While hiwa's solution is the much better one, I can point out the
error in
your code. It is this line:

hiddenWord = word.replace(te mp,'_');

On each iteration you are assigning hiddeWord the value of word after
it has had a single letter replaced. word, itself, remains unchanged
from loop to loop, to the changes are not cumultive.

hiddenWord = hiddenWord.repl ace(temp, '_');

is what you want. Of course, it assumes that above the loops you have
initially assign hiddenWord to word as in

hiddenWord = word;

Greg

PS: hiwa's solution is definitely better!

[S Manohar]

ne************* @hotmail.com (- ions) wrote in message news:<47******* *************** ****@posting.go ogle.com>...

public String hideWord(String word)
{
String alphabet = "ABCDEFGHIJKLMN OPQRSTUVWXYZ";
String hiddenWord="";
change this to:
hiddenWord=word ;

for(int i = 0;i<word.length ();i++)
{
char temp = word.charAt(i);

for(int j=0;j<alphabet. length();j++)
{
char letters = alphabet.charAt (j);

if(temp == letters)
{
hiddenWord = word.replace(te mp,'_');
change this to:
hiddenWord=hidd enWord.replace( temp,'_');

this will use the result of the previous 'replace()' as the input
to the next one. remember strings are immutable.

this seems a bit of a roundabout way of doing it, but yes it
should work...
}
}
}
return hiddenWord;
}

Any help much appreciated! Thanks :)