空字符串和单个分隔符字符串上的字符串拆分行为 [英] String split behaviour on empty string and on single delimiter string

问题描述

这是这个问题。

问题出在下面第二行。

"".split("x");   //returns {""}   // ok
"x".split("x");  //returns {}   but shouldn't it return {""} because it's the string before "x" ?
"xa".split("x"); //returns {"", "a"}    // see?, here "" is the first string returned
"ax".split("x"); //returns {"a"}

推荐答案

按照 java.util.regex.Pattern source ，其中 String.split（..）使用，

"".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", ""}

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