空字符串和单个定界符字符串的字符串拆分行为

具体根据

java.util.regex.Pattern

String.split(..)

"".split("x");   // returns {""} - valid - when no match is found, return the original string"x".split("x");  // returns {} - valid - trailing empty strings are removed from the resultant array {"", ""}"xa".split("x"); // returns {"", "a"} - valid - only trailing empty strings are removed"ax".split("x"); // returns {"a"} - valid - trailing empty strings are removed from the resultant array {"a", ""}