code: import java.io.File;
  import java.util.Date;
  public class FileModificationTimeTest {
     public static void test(String type, File file) {
         long t = file.lastModified();
         System.out.println("The following " + type + " called " + file.getPath() +
              (t == 0 ? " does not exist." : " was modified at " + new Date(t).toString() )
         );
         System.out.println("The following " + type + " called " + file.getPath() +
              (!file.setLastModified(System.currentTimeMillis()) ? " does not exist." : " was modified to current time." )
         );
         System.out.println("The following " + type + " called " + file.getPath() +
              (!file.setLastModified(t) ? " does not exist." : " was modified to previous time." )
         );
     }
     public static void main(String args[]) {
         test("file", new File("output.txt"));
         test("directory", new File("docs"));
     }
  }
  