Java Program to Get File Name from Absolute Path
What is Absolute Path ?
An absolute path in Java is a file or directory path that details a file or directory’s whole location within a file system, starting from the root directory.
Depending on the operating system, Java has a different syntax for specifying an absolute path. In a Unix-based system, the absolute path begins with a forward slash (e.g., “/home/john/documents/file.txt”), whereas in a Windows operating system, the absolute path might start with a drive letter followed by a colon (e.g., “C:UsersJohnDocumentsfile.txt”).
Ways to Get File Name from Absolute Path in Java :
1. Using the File class:
To obtain the file name, build a File object using the absolute path and then call the getName() method.
File file = new File("C:/Users/John/Documents/file.txt");
String fileName = file.getName();
System.out.println(fileName); // Output: file.txt
2. sing the Paths class:
You can use the Paths class to create a Path object with the absolute path and then call the getFileName() method to get the file name.
Path path = Paths.get("C:/Users/John/Documents/file.txt");
String fileName = path.getFileName().toString();
System.out.println(fileName); // Output: file.txt
3. Using String manipulation:
You can use string manipulation techniques such as substring() or lastIndexOf() to extract the file name from the absolute path.
String path = "C:/Users/John/Documents/file.txt";
String fileName = path.substring(path.lastIndexOf("/") + 1);
System.out.println(fileName); // Output: file.txt
Note :
Keep in mind that depending on the operating system and file separator used in the absolute path, the precise string manipulation method may change.
Example 1 :
import java.io.File;
public class Main {
public static void main(String[] args) {
// Absolute path of the file
String absolutePath = "C:/Users/John/Documents/file.txt";
// Create a File object with the absolute path
File file = new File(absolutePath);
// Get the file name using the getName() method
String fileName = file.getName();
// Print the file name
System.out.println("File name: " + fileName);
}
}
Output :
File name: file.tx
Explanation :
In this example, a File object containing the file's absolute path is created using the File class. The file name is then obtained and placed in the fileName variable by calling the getName() function on the File object. Lastly, System.out.println is used to output the file name to the console ().
Example 2 :
Run
import java.nio.file.Path;
import java.nio.file.Paths;
public class Main {
public static void main(String[] args) {
// Absolute path of the file
String absolutePath = "C:/Users/John/Documents/file.txt";
// Create a Path object with the absolute path
Path path = Paths.get(absolutePath);
// Get the file name using the getFileName() method
String fileName = path.getFileName().toString();
// Print the file name
System.out.println("File name: " + fileName);
}
}
Output :
File name: file.txt
Explanation :
In this example, a Path object is created using the file's absolute path using the Paths class. The file name is then obtained and put in the fileName variable by calling the getFileName() function on the Path object. Lastly, System.out.println is used to output the file name to the console ().
Example 3 :
Run
public class Main {
public static void main(String[] args) {
// Absolute path of the file
String absolutePath = "C:/Users/John/Documents/file.txt";
// Extract the file name using string manipulation
String fileName = absolutePath.substring(absolutePath.lastIndexOf("/") + 1);
// Print the file name
System.out.println("File name: " + fileName);
}
}
Output :
File name: file.txt
Explanation :
In this example, the file name is extracted from the absolute path using string manipulation techniques. The absolute path's last instance of the file separator is located using the lastIndexOf() function, and the file name is extracted from the path using the substring() method. The extracted file name is then saved in the fileName variable before using System.out.println to print the file name to the console (). Keep in mind that depending on the operating system and file separator used in the absolute path, the precise string manipulation method may change.
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