Java split() 方法混淆

Question

我不明白为什么它会这样工作 - 请参阅下面的 split() 方法的用例。

    String x = "one,";
    String y = ",one";
    System.out.println(Arrays.toString(x.split(","))); //prints [one]
    System.out.println(Arrays.toString(y.split(","))); //prints [, one]

我希望他们打印 [one, ] 和 [, one]。

Answer 1

split 的 Javadoc 回答说:

This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.

x.split(",",-1) 将产生 [one, ]。