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Java Tutorial : Java IO (Java File - How to Find and list out files with certain extension only-V2) |
Java Tutorial : Java IO (Java File - How to Find and list out files with certain extension only-V2) |
import java.io.File; import java.io.FilenameFilter; /* * boolean accept(File dir, String name) * * Parameters: * ---------- * * dir - the directory in which the file was found. * name - the name of the file. */ public class ExtensionFilter implements FilenameFilter { private String fileExtension; public ExtensionFilter(String fileExtension) { this.fileExtension = fileExtension; } /* * Tests if a specified file should be included in a * file list. * * Returns: true if and only if the name should be * included in the file list; false otherwise. */ @Override public boolean accept(File dir, String name) { return (name.endsWith(fileExtension)); } }FileDemo.java
import java.io.File; /* * public File[] listFiles(FilenameFilter filter) * * Parameters: * ---------- * * filter - A filename filter * * How to use FilenameFilter to list out all files that * are end with “.txt” extension in folder “D:/work“. * */ public class FileDemo { public static void main(String[] args) { FileDemo fileDemo = new FileDemo(); fileDemo.findAndListOutFiles("D:/work", ".txt"); } public void findAndListOutFiles(String dirName, String fileExtension) { File fileDir = new File(dirName); ExtensionFilter extFilter = new ExtensionFilter(fileExtension); /* * Returns an array of abstract pathnames denoting * the files and directories in the directory * denoted by this abstract pathname that satisfy * the specified filter. */ File[] listOfFiles = fileDir.listFiles(extFilter); if (listOfFiles.length == 0) { System.out.println("No files end with : " + fileExtension); return; } for (File file : listOfFiles) { System.out.println(file.getName()); } } }Output
Hello.txt Java.txt
https://sites.google.com/site/ramj2eev1/home/javabasics/JavaIODemo_File_listout_ext_array_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/JavaIODemo_File_listout_ext_array_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/a3d05269db9922e504bb1f9de8d07031990c9910/BasicJava/JavaIODemo_File_listout_ext_array_App/?at=master
See also:
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