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ちょっとしたことがGroovy 「リストの文字列表現で要素に任意の引用符つけたい」

テキストのリストに任意の引用符つけたい。

quateToString()
List.metaClass.toString = { squate,equate=null ->
  if(equate==null) equate = squate
  delegate.collect {"${squate}${it}${equate}"}
}
def l = ["a","b","c"];
println l.toString()
println l.toString("'")

常にこれでいいってわけではないけど。

追記:
シングルクオート以外にもこんなのとか行けます。

class cntP{
  def i=0;
  @Override
  String toString(){
    /<p class="num_${i++}">/
  }
}

println l.toString(new cntP(),"</p>")

出力こんなです。

[<p class="num_0">a</p>, <p class="num_1">b</p>, <p class="num_2">c</p>]
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Help us understand the problem. What are the problem?