[Chapter 24] 24.16 java.io.File (JDK 1.0)

#

| Chapter 24 The java.io Package |

## 24.16 java.io.File (JDK 1.0)

###

This class supports a platform-independent definition of file and directory names. It also provides methods to list the files in a directory, to check the existence, readability, writeability, type, size, and modification time of files and directories, to make new directories, to rename files and directories, and to delete files and directories. The constants defined by this class are the platform-dependent directory and path separator characters, available as a `String` or `char`.

`getName()` returns the name of the `File` with any directory names omitted. `getPath()` returns the full name of the file, including the directory name. `getParent()` returns the directory of the `File`. If the `File` is an absolute specification, then `getAbsolutePath()` returns the complete filename. Otherwise, if the `File` is a relative file specification, it returns the relative filename appended to the current working directory.

`isAbsolute()` tests whether the `File` is an absolute specification. `exists()`, `canWrite()`, `canRead()`, `isFile()`, and `isDirectory()` perform the obvious tests on the specified `File`. `length()` returns the length of the file. `lastModified()` returns the modification time of the file (which should be used for comparison with other file times only, and not interpreted as any particular time format).

`list()` returns the name of all entries in a directory that are not rejected by an optional `FilenameFilter`. `mkdir()` creates a directory. `mkdirs()` creates all the directories in a `File` specification. `renameTo()` renames a file or directory. `delete()` deletes a file or directory. Note that there is no method to create a file; that is done with a `FileOutputStream`.

    public class File extends Object implements Serializable {
        // Public Constructors
                public File(String path);
                public File(String path, String name);
                public File(File dir, String name);
        // Constants
                public static final String pathSeparator;
                public static final char pathSeparatorChar;
                public static final String separator;
                public static final char separatorChar;
        // Public Instance Methods
                public boolean canRead();
                public boolean canWrite();
                public boolean delete();
                public boolean equals(Object obj);  // Overrides Object
                public boolean exists();
                public String getAbsolutePath();
            1.1  public String getCanonicalPath() throws IOException;
                public String getName();
                public String getParent();
                public String getPath();
                public int hashCode();  // Overrides Object
                public native boolean isAbsolute();
                public boolean isDirectory();
                public boolean isFile();
                public long lastModified();
                public long length();
                public String[] list();
                public String[] list(FilenameFilter filter);
                public boolean mkdir();
                public boolean mkdirs();
                public boolean renameTo(File dest);
                public String toString();  // Overrides Object
    }

### Passed To:

File(), File.renameTo(), FileInputStream(), FilenameFilter.accept(), FileOutputStream(), FileReader(), FileWriter(), RandomAccessFile(), ZipFile()

java.io.Externalizable (JDK 1.1) |  | java.io.FileDescriptor (JDK 1.0)