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
// Java program to demonstrate the// use of list() function import java.io.*; public class solution { public static void main(String args[]) { // try-catch block to handle exceptions try { // Create a file object File f = new File("f:\\program"); // Get all the names of the files present // in the given directory String[] files = f.list(); System.out.println("Files are:"); // Display the names of the files 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”
// Java program to demonstrate the// use of list() function import java.io.*; public class solution { public static void main(String atry-catch { // try catch block to handle exceptions try { // Create a file object File f = new File("f:\\program"); // Create a FilenameFilter FilenameFilter filter = new FilenameFilter() { public boolean accept(File f, String name) { return name.startsWith("12"); } }; // Get all the names of the files present // in the given directory // and whose names start with "12" String[] files = f.list(filter); System.out.println("Files are:"); // Display the names of the files 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
