java - Split 方法忽略末尾的逗号

Question

当我用多个逗号分割一个字符串时，它们在数组中被忽略。这是对的吗 ？

    String a = "a,b,c,,f,,";
    String[] sdf = a.split(",");
    for (int i = 0; i < sdf.length; i++) {
        System.out.println(sdf[i]);
    }

或者我错过了什么。

我得到的输出是

[a,b,c, ,f]   

我想考虑这些空白值，期待这样的事情

[a,b,c, ,f, ,] 

Answer 1

您需要使用:

public String[] split(String regex,
                  int limit)

并说:

String[] sdf = a.split(",", -1);

对于您的输入，它会产生:

[a, b, c, , f, , ]

引自documentation :

If n is non-positive then the pattern will be applied as many times as possible and the array can have any length.