Java String拆分无法正常工作 [英] Java String split is not working

问题描述

Java专家，

请查看以下拆分命令代码，让我知道为什么不捕获最后两个空值。

Please look into the below split command code and let me know why last two nulls are not captured.

String test = "1,O1,,,,0.0000,0.0000,,";
String[] splittest = test.split(",");
System.out.println("length -"+splittest.length);
for (String string : splittest) {
    System.out.println("value"+string);
}

我得到的结果

length -7
value1
valueO1
value
value
value
value0.0000
value0.0000

令人惊讶的是长度是7，因为它应该是9，你也可以看到0.0000之后的值，即两个最后的空值未到来。让我们说现在，如果我改变字符串测试
1，O1 ,,,, 0.0000,0.0000,0,0

surprisingly the length is 7 where as it should be 9 and also as you can see values after 0.0000 ie two last nulls are not coming . Lets say now if i change the string test "1,O1,,,,0.0000,0.0000,0,0"

String test = "1,O1,,,,0.0000,0.0000,0,0";
String[] splittest = test.split(",");
System.out.println("length -"+splittest.length);
for (String string : splittest) {
    System.out.println("value"+string);
}

我收到了正确

length -9
value1
valueO1
value
value
value
value0.0000
value0.0000
value0
value0

我不认为我在做什么错了。这是一个错误吗？ JAVA版本 - jdk1.6.0_31

I don't think iam doing wrong . Is it a bug ? JAVA Version - jdk1.6.0_31

推荐答案

它的行为与 javadoc ：

此方法的作用就像通过调用给定表达式和limit参数为零的双参数split方法一样。 结果数组中不包含尾随空字符串。

如果要保留尾随空白字符串，你可以使用 2参数拆分方法，带有负限制：

If you want to keep the trailing blank strings, you can use the 2 argument split method with a negative limit:

String[] splittest = test.split(",", -1);

如果限制为非正数，则模式将应用为尽可能多次，数组可以有任何长度。

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

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