22.24

java.io.File

THE PACKAGE JAVA.IO

22.24 The Class

java.io.File

A

File

 object contains a

path

, which is a character string that can be used to iden 

tify a file within a file system. A path is assumed to consist of two parts, the

direc 

tory

 and the

file name

, separated by the last occurrence within the path of a

particular character known as the

separator character

. Some methods provide

access to parts of the path string; other methods operate on the file that is identi 

fied by the path string. The details of such operations on files are to some extent

dependent on the implementation of the host file system. The

File

 class is

designed to provide a set of abstract operations that are reasonably portable across

otherwise incompatible file systems.

public class File {

public static final String separator =

System.getProperty("file.separator");

public static final char separatorChar =

separator.charAt(0);

public static final String pathSeparator =

System.getProperty("path.separator");

public static final char pathSeparatorChar =

pathSeparator.charAt(0);

public File(String path) throws NullPointerException;

public File(String dirname, String name)

throws NullPointerException

public File(File dir, String name)

throws NullPointerException

public String toString();

public boolean equals(Object obj);

public int hashCode();

public String getName();

public String getPath();

public String getAbsolutePath();

public String getParent();

public native boolean isAbsolute();

public boolean exists() throws SecurityException;

public boolean canRead() throws SecurityException;

public boolean canWrite() throws SecurityException;

public boolean isFile() throws SecurityException;

public boolean isDirectory() throws SecurityException;

public long lastModified() throws SecurityException;

public long length() throws SecurityException;

public boolean mkdir() throws SecurityException;

public boolean mkdirs() throws SecurityException;

public String[] list() throws SecurityException;

752