接下来使用Java Scanner读取文本(模式模式) [英] Reading text with Java Scanner next(Pattern pattern)

问题描述

我试图使用Scanner类使用next(Pattern pattern)方法读取一行以捕获冒号之前和冒号之后的文本，以便s1 = textbeforecolon和s2 = textaftercolon.

I am trying to use the Scanner class to read a line using the next(Pattern pattern) method to capture the text before the colon and then after the colon so that s1 = textbeforecolon and s2 = textaftercolon.

该行如下所示:

something:somethingelse

something:somethingelse

推荐答案

有两种方法，具体取决于您想要的东西.

There are two ways of doing this, depending on specifically what you want.

如果要用冒号分隔整个输入，则可以使用useDelimiter()方法，就像其他人指出的那样:

If you want to split the entire input by colons, then you can use the useDelimiter() method, like others have pointed out:

// You could also say "scanner.useDelimiter(Pattern.compile(":"))", but
// that's the exact same thing as saying "scanner.useDelimiter(":")".
scanner.useDelimiter(":");

// Examines each token one at a time
while (scanner.hasNext())
{
    String token = scanner.next();
    // Do something with token here...
}

如果要用冒号分隔每行，那么使用String的split()方法会容易得多:

If you want to split each line by a colon, then it would be much easier to use String's split() method:

while (scanner.hasNextLine())
{
    String[] parts = scanner.nextLine().split(":");
    // The parts array now contains ["something", "somethingelse"]
}

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