Creating New Files and Directories in Java File and Stream

By Rakesh Jat

file systems, reading from files, or writing to files, from java.io: System Class Input and Output

The File class can be used to create files and directories. A file can be created whose
pathname is specified in a File object using the following method:
A directory whose pathname is specified in a File object can be created using the
following methods:
String[] list()
String[] list(FilenameFilter filter)
File[] listFiles()
File[] listFiles(FilenameFilter filter)
File[] listFiles(FileFilter filter)
The filter argument can be used to specify a filter that determines whether an
entry should be included in the list. These methods return null if the abstract
pathname does not denote a directory, or if an I/O error occurs. A filter is an
object of a class that implements either of these two interfaces:
interface FilenameFilter {
boolean accept(File currentDirectory, String entryName);
}
interface FileFilter {
boolean accept(File pathname);
}
The list() methods call the accept() methods of the filter for each entry to
determine whether the entry should be included in the list.
boolean createNewFile() throws IOException
It creates a new, empty file named by the abstract pathname if, and only if, a
file with this name does not already exist. The returned value is true if the file
was successfully created, false if the file already exists. Any I/O error results
in an IOException.
boolean mkdir()
boolean mkdirs()
The mkdirs() method creates any intervening parent directories in the
pathname of the directory to be created..

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