Understand Path, Paths and Files in Java NIO
Jun 27, 2020
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Understand Path, Paths and Files in Java NIO
Java NIO (New Input Output) comes with following utility classes
java.nio.file.Path
A Path represents a path that is hierarchical and composed of a sequence of directory and file name elements separated by a special separator or delimiter
java.nio.file.Paths
This class consists exclusively of static methods that return a Path by converting a path string or URI
java.nio.file.Files
This class consists exclusively of static methods that operate on files, directories, or other types of files.
To locate a Path we use the static method get() of Paths class which returns the Path object which is then passed to Files methods to start the operation.
For Example to Create a Directory Following Block of the Code is required
Path p=Paths.get("D:\\Code With Z\\New Folder");
Path path=Files.createDirectory(p);Paths convert the path fed in String/URI and generate a Path object for it, an later the same Path object is passed to the static method of Files.
Some of the important methods of Files class are as follows
| Method (all methods are static) | Returns | Description |
| File Operations | ||
|---|---|---|
| createDirectory(Path dir, FileAttribute ... attrs) | Path | Creates a new directory. |
| createFile(Path path, FileAttribute ... attrs) | Path | Creates a new and empty file, failing if the file already exists. |
| delete(Path path) | boolean | Deletes a file. |
| copy(Path source, Path target, CopyOption...options) | Path | Copy a File to a target file |
| list(Path dir) | Stream | Return a lazily populated Stream, the elements of which are the entries in the directory. |
| move(Path source, Path target, CopyOption ...options) | Path | Move or rename a file to a target file. |
| File Details | ||
| isExecutable(Path path) | boolean | Tests whether a file is executable. |
| isHidden(Path path) | booelan | Tells whether or not a file is considered hidden. |
| isReadable(Path path) | booelan | Tests whether a file is readable. |
| exists(Path path, LinkOption... option) | booelan | Tests whether a file exists. |
| notExists(Path path, LinkOption ... option) | booelan | Tests whether the file located by this path does not exist. |
| size(Path path) | long | Returns the size of a file (in bytes). |
| Reading and Writing Operations | ||
| readAllLines(Path path) | List | Read all lines from a file. |
| readAllBytes(Path path) | byte[ ] | Reads all the bytes from a file. |
| write(Path path, byte[ ] bytes, OpenOption... options) | Path | Writes bytes to a file. |
| write(Path path, Iterable lines, OpenOption... options) | Path | Write lines of text to a file. |
So these are the methods available with Files class which we will be making use in the further tutorials for the Files management.
