It is very simple to delete file from specific directory.Java File class provides delete() method can be used to delete files or empty directory/folder in java. Java file delete method returns true if file gets deleted and returns false if file doesn’t exist.

1. Create a file named "sample.txt" in directory "C://workspace'.
2. Create File class object by passing file absolute location path.
3. call delete() method of file object to delete "sample.txt" file from directory "C://workspace"
4. delete() method returns true if and only if the file or directory is successfully deleted; false otherwise.
5. Observe the directory whether file is deleted or not.

import java.io.File;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
 * This Java program demonstrates how to delete a file in Java.
 * @author javaguides.net
 */
public class DeleteFileExample {
	private static final Logger LOGGER = LoggerFactory
			.getLogger(DeleteFileExample.class);
	
	public static void main(String[] args) {
		deleteFile();
	}
	public static void deleteFile() {
		File file = new File("C://workspace/sample.txt");
		if (file.delete()) {
			LOGGER.info(file.getName() + "created !!");
		} else {
			LOGGER.info("Delete operation failed");
		}
	}
}

https://docs.oracle.com/javase/8/docs/api/java/io/File.html