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Get file extension name in Java
The file extension is the suffix that is attached to the computer file and it denotes the format of the file. A program that demonstrates getting the file extension name is given as follows −
Example
import java.io.File;
public class Demo {
private static String fileExtension(File file) {
String name = file.getName();
if(name.lastIndexOf(".") != -1 && name.lastIndexOf(".") != 0)
return name.substring(name.lastIndexOf(".") + 1);
else
return "";
}
public static void main(String[] args) {
File file = new File("demo1.txt");
System.out.println("The file extension is: " + fileExtension(file));
}
}The output of the above program is as follows −
Output
The file extension is: txt
Now let us understand the above program.
The method fileExtension() returns the file extension and it takes a single parameter i.e. the File class object. A code snippet that demonstrates this is given as follows −
private static String fileExtension(File file) {
String name = file.getName();
if(name.lastIndexOf(".") != -1 && name.lastIndexOf(".") != 0)
return name.substring(name.lastIndexOf(".") + 1);
else
return "";
}The method main() calls the method fileExtension() and prints the file extension returned. A code snippet that demonstrates this is given as follows −
public static void main(String[] args) {
File file = new File("demo1.txt");
System.out.println("The file extension is: " + fileExtension(file));
}
Updated on: 30-Jul-2019
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