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Convert a java arraylist to comma delimited string

Posted on 2008-06-13
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Last Modified: 2008-06-13
Is there a fast way to convert a java arraylist to comma delimited string without using an Iterator?
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Question by:lasutton
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4 Comments
 
LVL 27

Accepted Solution

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rrz earned 500 total points
ID: 21779141
You could use
String  listStringWithBrackets = myList.toString();
and then strip the brackets.
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by:lasutton
ID: 21779228
Thanks!

String myString= myArrayList.toString();
myString= myString.substring(1,myString.length()-1);
       
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Expert Comment

by:brunoguimaraes
ID: 21779256
Actually the toString method will not return the arraylist's values, unless you override it.

I think you'll have to iterate through the arraylist, but you can use the enhanced for loop (if you're using JDK 5 or greater):
StringBuilder sb = new StringBuilder();
int count = 0;
 
for (String s : yourArray) {
     sb.append(s);
     if (++count != yourArray.length) {
         sb.append(",");
     }
}
 
return sb.toString();

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LVL 23

Expert Comment

by:Ajay-Singh
ID: 21779300
> Is there a fast way to convert a java arraylist to comma delimited string without using an Iterator?
NO. You need to traverse through the list once to produce the string output. toString method does the same.
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