转换List< String>中的定界字符串列出< String>

问题描述：

假设我们有一个List<String>，其中某些值包含定界符,，我们如何将split合并为List<String>而没有定界符,?

Assume we have a List<String> with some values containing the delimiter ,, how do we convert split and merge into a List<String> without the delimiter ,?

输入:[ "1,2", "3,4", "5" ]

输出:[ "1", "2", "3", "4", "5" ]

验证码

List<String> input = Arrays.asList("1,2", "3,4", "5");
List<String> output = new ArrayList<>();
for (String str : input) {
  for (String split : str.split(",")) {
    output.add(split);
  }
}

答

您可以使用Stream s来做到这一点:

You can do it with Streams:

List<String> output = input.stream()
                           .flatMap(s -> Arrays.stream(s.split(",")))
                           .collect(Collectors.toList());

例如，

List<String> input = Arrays.asList("1,2", "3,4", "5" );
List<String> output = input.stream()
                           .flatMap(s -> Arrays.stream(s.split(",")))
                           .collect(Collectors.toList());
System.out.println (output);

将输出

[1, 2, 3, 4, 5]

转换List< String>中的定界字符串列出< String>

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