java split方法

String a = "O|O||";

System.out.println(a.split("\|").length); //["O", "O"] 默认limit为0
System.out.println(a.split("\|", 0).length);//["O", "O"] 丢弃数组结尾的空字符串

System.out.println(a.split("\|", 1).length);//["O"] 数组最大长度为1 
System.out.println(a.split("\|", 2).length);//["O", "O"] 数组最大长度为2 
System.out.println(a.split("\|", 3).length);//["O", "O", ""] 数组最大长度为3 
System.out.println(a.split("\|", 4).length);//["O", "O", "", ""] 数组最大长度为4 
System.out.println(a.split("\|", 5).length);//["O", "O", "", ""] 数组最大长度为5，但可分割的最长为4

System.out.println(a.split("\|", -1).length);//["O", "O", "", ""] 字符串可分割的最大长度 4 
System.out.println(a.split("\|", -2).length);//["O", "O", "", ""] 字符串可分割的最大长度 4