Listing Files or Subdirectories
Introduction
This example illustrates how to list files and
folders present in the specified directory. This topic is related to the
I/O
(input/output) of java.io package.
In this example we are using File class of java.io
package. The File class is an abstract representation of file and
directory pathnames. This class is an abstract, system-independent view
of hierarchical pathnames. An abstract pathname has two
components:
- An optional system-dependent prefix string,
such as a disk-drive specifier, "/" for the
UNIX root directory, or "\\" for a Win32 UNC
pathname, and
-
A sequence of zero or more string names.
Explanation
This program list the file of the specified directory. We will be
declaring a function called dirlist which lists the contents present in the
specified directory.
dirlist(String fname)
The function dirlist(String fname) takes directory name as parameter.
The function creates a new File instance for the directory name passed
as parameter
File dir = new File(fname);
and retrieves the list of all the files and folders present in the
directory by calling list() method on it.
String[] chld = dir.list();
Then it prints the name of files and folders present in the directory.
Code of the Program :
import java.io.*;
public class DirListing{
private static void dirlist(String fname){
File dir = new File(fname);
String[] chld = dir.list();
if(chld == null){
System.out.println("Specified directory does not exist or is not a directory.");
System.exit(0);
}else{
for(int i = 0; i < chld.length; i++){
String fileName = chld[i];
System.out.println(fileName);
}
}
}
public static void main(String[] args){
switch(args.length){
case 0: System.out.println("Directory has not mentioned.");
System.exit(0);
case 1: dirlist(args[0]);
System.exit(0);
default : System.out.println("Multiple files are not allow.");
System.exit(0);
}
}
}
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Output of the Program:
C:\nisha>java DirListing example
myfile.txt
C:\nisha>
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At the time of execution, we have specified a directory name "example"
that contains only a single file "myfile.txt".
Download this example Example
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