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                ### [`Scanner`分隔符](https://lingcoder.gitee.io/onjava8/#/book/18-Strings?id=scanner-%e5%88%86%e9%9a%94%e7%ac%a6) 默認情況下,`Scanner`根據空白字符對輸入進行分詞,但是你可以用正則表達式指定自己所需的分隔符: ~~~ // strings/ScannerDelimiter.java import java.util.*; public class ScannerDelimiter { public static void main(String[] args) { Scanner scanner = new Scanner("12, 42, 78, 99, 42"); scanner.useDelimiter("\\s*,\\s*"); while(scanner.hasNextInt()) System.out.println(scanner.nextInt()); } } /* Output: 12 42 78 99 42 */ ~~~ 這個例子使用逗號(包括逗號前后任意的空白字符)作為分隔符,同樣的技術也可以用來讀取逗號分隔的文件。我們可以用`useDelimiter()`來設置分隔符,同時,還有一個`delimiter()`方法,用來返回當前正在作為分隔符使用的`Pattern`對象。
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