How to append custom number of characters to a string?

Question

How to add to custom position in a string variable number of custom characters not using any loops? What is the most efficient way?

if(s.length() < width) {  //add spaces
            n = width - s.length();
            s = (' '*n ) + s; // pseudo code
       }

Can you show us what you have tried? Your question is a bit vague. — Chris Chambers, Dec 08 '13 at 22:07
Maybe it's me, but I'm not clear on what you're trying to do. If you don't get a decent answer soon, please clarify the question. Perhaps you want to use a StringBuilder, but I'm not sure? — Hovercraft Full Of Eels, Dec 08 '13 at 22:08
What do you mean by custom characters ? May you're looking for the `insert(int offset, CharSequence cs)` method of the StringBuilder class. `StringBuilder sb = new StringBuilder(s); sb.insert(2, "aaaa"); s = sb.toString();` — Alexis C., Dec 08 '13 at 22:09
`String s = input.substring(0, x) + yourChars + input.substring(x+1);` ?! — Blub, Dec 08 '13 at 22:10
does this http://stackoverflow.com/questions/388461/how-can-i-pad-a-string-in-java help? — Anirban Nag 'tintinmj', Dec 08 '13 at 22:11
@EdgarBoda: It's defined at runtime how much of `yourChars` is needed. — J.Olufsen, Dec 08 '13 at 22:16

score 1 · Accepted Answer · edited May 23 '17 at 12:03

1

Try like this:

String repeated = new String(new char[n]).replace("\0", yourChar);
String s = input.substring(0, x) + repeated + input.substring(x+1);

Where n is the amount of times you want the String yourChar repeated (which can also be longer than just one Character)

From: Link.

edited May 23 '17 at 12:03

Community

answered Dec 08 '13 at 22:18

Blub

1 Answers1