string.split()方法

p(String.valueOf("5".split("\\.").length));     //print "1"

p(String.valueOf(".5".split("\\.").length));    //print "2"

p(String.valueOf("\"\".5".split("\\.").length));//print "2"

p(String.valueOf("5.".split("\\.").length));    //print "1"

p(String.valueOf("5.\"\"".split("\\.").length));//print "2"

p(String.valueOf("".split("hi").length));//print "1"

p(String.valueOf("hi?".split("\\?").length)); //pring "1"

还有：

"  hi".split("\\s+") = {"","hi"}