Java traps之字符串split

字符串split

Java中，字符串的split(“,”)与split(“,”, -1)的区别：一个忽略末尾的空字符，一个不忽略末尾的空字符。
例如：

"test,,"split(",")返回的数组长度为1split(",", -1)返回的数组长度为3

jdk中关于split(String regex, int limit)中参数limit的说明：

 * <p> The {@code limit} parameter controls the number of times the * pattern is applied and therefore affects the length of the resulting * array.  If the limit <i>n</i> is greater than zero then the pattern * will be applied at most <i>n</i>&nbsp;-&nbsp;1 times, the array's * length will be no greater than <i>n</i>, and the array's last entry * will contain all input beyond the last matched delimiter.  If <i>n</i> * is non-positive then the pattern will be applied as many times as * possible and the array can have any length.  If <i>n</i> is zero then * the pattern will be applied as many times as possible, the array can * have any length, and trailing empty strings will be discarded.