File class. About File and FileFilter, FilenameFilter interfaces

1. Язык Java
Объект File
java.io

2. File
● public static final char separatorChar
● public static final String separator
● public static final char pathSeparatorChar
● public static final String pathSeparator
● public File(String pathname)
● public File(String parent, String child)
● public File(File parent, String child)
● public File(URI uri)
● public String getName()
● public String getParent()
● public File getParentFile()
● public String getPath()
● public boolean isAbsolute()
● public String getAbsolutePath()
● public File getAbsoluteFile()
● public String getCanonicalPath() throws IOException
● public File getCanonicalFile() throws IOException

3. File (продолжение)
● public boolean canRead()
● public boolean canWrite()
● public boolean exists()
● public boolean isDirectory()
● public boolean isFile()
● public boolean isHidden()
● public long lastModified()
● public long length()
● public boolean createNewFile() throws IOException
● public boolean delete()
● public String[] list()
● public String[] list(FilenameFilter filter)
● public File[] listFiles()
● public File[] listFiles(FilenameFilter filter)
● public File[] listFiles(FileFilter filter)
● public boolean mkdir()
● public boolean mkdirs()
● public boolean renameTo(File dest)

4. File (продолжение)
● public boolean setReadOnly()
● public boolean setWritable(boolean writable, boolean
ownerOnly)
● public boolean setWritable(boolean writable)
● public boolean setReadable(boolean readable, boolean
ownerOnly)
● public boolean setReadable(boolean readable)
● public boolean setExecutable(boolean executable, boolean
ownerOnly)
● public boolean setExecutable(boolean executable)
● public boolean canExecute()
● public long getTotalSpace()
● public long getFreeSpace()
● public long getUsableSpace()
● public static File createTempFile(String prefix, String suffix,
File directory)
● public static File createTempFile(String prefix, String suffix)
throws IOException

5. Пример использования
● private File f;
private Date d;
private File f1;
public FileTestClass(String name, String name2)
{
f1=new File(name);
d=new Date(f1.lastModified());
f=new File(name2);
}
public String[] outAllFiles()
{
File[] fs=f.listFiles(new MyFilter(d));
String[] ss=new String[fs.length];
for(int i=0;i<fs.length;++i)
ss[i]=fs[i].getPath();
return ss;
}

6. Интерфейс FileFilter
● public interface FileFilter{
boolean accept(File pathname);
}

7. Пример использования
● public class MyFilter implements FileFilter{
private Date date;
public MyFilter(Date date)
{
this.date=date;
}
public boolean accept(File pathname) {
Date date1 = new Date(pathname.lastModified());
return (date.getTime()>=date1.getTime());
}
}

8. Интерфейс FilanameFilter
● interface FilenameFilter {
boolean accept(File dir, String name);
}

9. Работа со временем
● class Date
● public Date(long date)
● class GregorianCalendar
● public GregorianCalendar(int year, int month, int
dayOfMonth, int hourOfDay, int minute, int second)
● public final Date getTime()
● public final void setTime(Date date)

10. Конец
Вопросы
e-mail: a.bovanenko@gmail.com