File list() method in Java with Examples
Last Updated :
30 Jan, 2019
The list() method is a part of File class.The function returns an array of string denoting the files in a given abstract pathname if the path name is a directory else returns null. The function is an overloaded function. One of the function does not have any parameter and the other function takes FilenameFilter object as parameter
Function Signature:
public String[] list()
public String[] list(FilenameFilter f)
Function Syntax:
file.list()
file.list(filter)
Parameters: The function is an overloaded function. One of the function does not have any parameter and the other function takes FilenameFilter object as a parameter
Return value: The function returns a string array, or null value if the file object is file.
Exception: This method throws Security Exception if the function is not allowed write access to the file.
Below programs will illustrate the use of the list() function
Example 1: We will try to find all the files and directories in a given directory
import java.io.*;
public class solution {
public static void main(String args[])
{
try {
File f = new File( "f:\\program" );
String[] files = f.list();
System.out.println( "Files are:" );
for ( int i = 0 ; i < files.length; i++) {
System.out.println(files[i]);
}
}
catch (Exception e) {
System.err.println(e.getMessage());
}
}
}
|
Output:
Files are:
1232.txt
1245.txt
5671.txt
program1
Example 2: We will try to find all the files and directories in a given directory whose names start with “12”
import java.io.*;
public class solution {
public static void main(String atry- catch {
try {
File f = new File( "f:\\program" );
FilenameFilter filter = new FilenameFilter() {
public boolean accept(File f, String name)
{
return name.startsWith( "12" );
}
};
String[] files = f.list(filter);
System.out.println( "Files are:" );
for ( int i = 0 ; i < files.length; i++) {
System.out.println(files[i]);
}
}
catch (Exception e) {
System.err.println(e.getMessage());
}
}
|
Output:
Files are:
1232.txt
1245.txt
The programs might not run in an online IDE. please use an offline IDE and set the Parent file of the file
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