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From "Stepan Koltsov (JIRA)" <>
Subject [jira] Created: (LANG-266) Wish for StringUtils.join(Collection, *)
Date Sat, 01 Jul 2006 21:49:29 GMT
Wish for StringUtils.join(Collection, *)

         Key: LANG-266
     Project: Commons Lang
        Type: Wish

    Versions: Nightly Builds    
    Reporter: Stepan Koltsov
    Priority: Trivial

There is a lack of StringUtils.join(Collection, String) method in commons-lang. Could you
please add it?

Commons-lang has method join(Iterator, String), however join(Collection, String) is still
useful. Join is used very often, and in most situations it is used with Collection, not with
Iterator, because almost all methods return Collections, not Iterators and a lot of data is
stored as Collections, not as Iterators. The string ".iterator()" has 11 characters while
line for code is only 72 chars. I've found that in my code there are several methods that
could be one line shorter if it was StringUtils.join(Collection, String). Compare:

// with StringUtils.join(Collection, String)
return "UNIQUE (" + StringUtils.join(unique.getColumnNames(), ", ") + ")";


// without
Iterator columnNames = unique.getColumnNames().iterator();
return "UNIQUE (" + StringUtils.join(columnNames, ", ") + ")";

Motivation is almost same as "Why we have StringUtils.join(Object[], String) while we could
write StringUtils.join(Arrays.asList(array).iterator(), separator)?"

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