StringUtils.join方法

D:\TDDOWNLOAD\hbase-0.90.5\hbase-0.90.5\lib\commons-lang-2.5.jar

join
public static String join(Object[] array)
Joins the elements of the provided array into a single String
containing the provided list of elements.

No separator is added to the joined String.
Null objects or empty strings within the array are represented by
empty strings.
 StringUtils.join(null)            = null
 StringUtils.join([])              = ""
 StringUtils.join([null])          = ""
 StringUtils.join(["a", "b", "c"]) = "abc"
 StringUtils.join([null, "", "a"]) = "a"
 

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