StringUtils.join(Object array[],String seperator)的用法、例子
String[] str =new String[]{"1","2","3","4"};
String str2=StringUtils.join(str, ",");
System.out.println(str2);
输出结果:1,2,3,4
StringUtils.join(Object array[], String separator),用separator,比如","来把数组的元素间隔,组成一个新的字符串。