convert a collection of char into string without the comma and square brackets

Question

I want to print a string that is converted from a collection of characters. But I want to eliminate the commas (,) and square brackets([]) from the printing string.

List<Character> word_to_show = new ArrayList<Character>(); 
for(char ch:jumbled_word.toCharArray()){ 
 word_to_show.add(ch); 
} 
Collections.shuffle(word_to_show); 
for (Object ch: word_to_show) 
  System.out.print((Character) ch ); 
System.out.println(); 
send_to_timer = word_to_show.toString(); 

I have come to this. It works but prints the string as, say for eg, [a, b, c]

Answer 1

You can use replace()

string.replace(",","").replace("[","").replace("]","")

Demo

Answer 2

If you have a real Collection containing characters, you can simply iterate that collection - and use a StringBuilder to append all those characters that you want to have in your final string; like:

StringBuilder validChars = new StringBuilder();
for (Character chr : yourCollection) {
  if (chr != ' ' && chr != ',') {
     validChars.append(chr);
  }
}

First turning all characters into a string, then use replace() to create a new string with less characters seems a bit inefficient.