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                ## [文件系統](https://lingcoder.gitee.io/onjava8/#/book/17-Files?id=%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f) 為了完整起見,我們需要一種方法查找文件系統相關的其他信息。在這里,我們使用靜態的**FileSystems**工具類獲取"默認"的文件系統,但你同樣也可以在**Path**對象上調用**getFileSystem()**以獲取創建該**Path**的文件系統。你可以獲得給定*URI*的文件系統,還可以構建新的文件系統(對于支持它的操作系統)。 ~~~ // files/FileSystemDemo.java import java.nio.file.*; public class FileSystemDemo { static void show(String id, Object o) { System.out.println(id + ": " + o); } public static void main(String[] args) { System.out.println(System.getProperty("os.name")); FileSystem fsys = FileSystems.getDefault(); for(FileStore fs : fsys.getFileStores()) show("File Store", fs); for(Path rd : fsys.getRootDirectories()) show("Root Directory", rd); show("Separator", fsys.getSeparator()); show("UserPrincipalLookupService", fsys.getUserPrincipalLookupService()); show("isOpen", fsys.isOpen()); show("isReadOnly", fsys.isReadOnly()); show("FileSystemProvider", fsys.provider()); show("File Attribute Views", fsys.supportedFileAttributeViews()); } } /* 輸出: Windows 10 File Store: SSD (C:) Root Directory: C:\ Root Directory: D:\ Separator: \ UserPrincipalLookupService: sun.nio.fs.WindowsFileSystem$LookupService$1@15db9742 isOpen: true isReadOnly: false FileSystemProvider: sun.nio.fs.WindowsFileSystemProvider@6d06d69c File Attribute Views: [owner, dos, acl, basic, user] */ ~~~ 一個**FileSystem**對象也能生成**WatchService**和**PathMatcher**對象,將會在接下來兩章中詳細講解。
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