Java source code examples

Change file or directory permission using java
The setReadOnly, setWritable,setReadable and setExecutable methods of the file class is used for changing the permissions on a file.

import java.io.File;
/**
* File class examples.
* Performs different permission operations on a file or directory.
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the source [...]

[Read more →]

Change the last modified date of a file or directory.
The setLastModified method of file class can be used for changing the last modified time of a directory or a file.

import java.io.File;
import java.util.Date;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the source file/directory
File file = new [...]

[Read more →]

Moving a file or directory in Java
The renameTo method of file class can be used for moving a file or directory to another destination.

import java.io.File;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the source file/directory
File file = new File(“d:\\temp\\test.txt”);

// Create the destination file/directory.
File destintation = [...]

[Read more →]

Renaming a file in Java
The renameTo method of file class can be used for renaming a file or directory.

import java.io.File;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the source file/directory
File file = new File(“d:\\temp\\test.txt”);

// Create the destination file/directory.
File destintation = new File(“d:\\temp\\test1.text”);

// Rename the file.
boolean [...]

[Read more →]

Creating a directory with sub directory
The mkdirs method of file class is used for creating a direcory and sub directories in Java

import java.io.File;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the directory
File file = new File(“d:\\temp\\dir\\subdir”);

// Create directory and sub directories.
boolean status = file.mkdirs();

System.out.println(“Directory creation [...]

[Read more →]

Create a directory using java
The mkdir method of file class is used for creating a new directory in java.

import java.io.File;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the directory
File file = new File(“d:\\temp\\dir”);

// Create directory
boolean status = file.mkdir();

System.out.println(“Directory creation status – “+status);

}
}

[Read more →]

Creating a FileFilter
We need to implement the FileFilter class for creating a file filter. The FileFilter interface contains only one method accept(File). This method is used for checking whether a file should be included or excluded.

import java.io.File;
import java.io.FilenameFilter;
/**
*
* A file filter.
*
*/
class TextFileFilter implements FileFilter {
/**
* Pattern would contain the [...]

[Read more →]

List all the contents of a directory according to a filter.
The list method of File class can be used for listing all the contents of a directory according to a filter.

import java.io.File;
import java.io.FilenameFilter;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the directory
File file = new [...]

[Read more →]

Writing a filename filter.
We need to implement the FilenameFilter class for writing a filename filter. The FilenameFilter interface contains only one method accept(File, String). This method is used for checking whether a file should be included.

import java.io.File;
import java.io.FilenameFilter;
/**
*
* A file filter.
*
*/
class FileFilter implements FilenameFilter{
/**
* Pattern would contain the extension [...]

[Read more →]

The list method of File class can be used for listing all the contents of a directory.

import java.io.File;
/**
* File class examples
*/
public class FileExample {
public static void main(String[] args){
// Create file object representing the directory
File file = new File(“d:\\temp”);

// List the contents of the directory.
String contents[] = file.list();

// Loop through the array and display [...]

[Read more →]