Handling files in Java

The java.io.File class provides ways to access file and directory information. It also allows file-level operations like rename, delete and move.

Checkout the source here.

/**

* A program to list all files and directories in a given directory.

*

* @author megha birmiwal

*/

public class DirectoryLister {

public void listDirectories(String filepath) {

File topDir = new File(filepath);

if (!topDir.exists()) {

System.out.println("Directory does not exist: " + filepath);

return;

}

if (!topDir.isDirectory()) {

System.out.println("Not a directory: " + filepath);

return;

}

File[] files = topDir.listFiles();

for (File file : files) {

if (file.isHidden()) {

// do not show hidden files

continue;

}

if (file.isDirectory()) {

System.out.println(file.getName() + " - D");

} else {

System.out.println(file.getName() + " - " + file.length());

}

// You can use the File APIs to play around with files, eg. rename or delete etc.

//                      String name = file.getName();

//                      name = name.replace(".png", ".jpg");

//                      name = name + ".txt";

//                  file.renameTo(new File(name));

//          file.delete();

}

}

public static void main(String[] args) {

DirectoryLister lister = new DirectoryLister();

lister.listDirectories("/");

}

}

Linked List Example

Here's an example of how to use a LinkedList. It's very similar to an ArrayList as both implement the List interface.

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Array List Example

An example that shows how to use the ArrayList class from java collections. Here we use a list backed by an array.

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