Написать монитор с помощью операторов пересечения списков, которых хранит дату модификации файлов и выводит сообщения при изменении в файлах* .*/

filePlusData

package Monitor2;

import java.io.File;
import java.util.Date;

public class filePlusData  {
	File file;
	long lm;
	
	public filePlusData(String path){
		file = new File(path);
		lm = file.lastModified();
	}
	
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((file == null) ? 0 : file.hashCode());
		result = prime * result + (int) (lm ^ (lm >>> 32));
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		filePlusData other = (filePlusData) obj;
		if (file == null) {
			if (other.file != null)
				return false;
		} else if (!file.equals(other.file))
			return false;
		if (lm != other.lm)
			return false;
		return true;
	}

	public File getFile(){
		return file;
	}
	
	public long getLM(){
		return lm;
	}

}

Monitor2-1

package Monitor2;

import java.lang.InterruptedException;
import java.nio.file.Files;
import java.nio.file.attribute.BasicFileAttributes;
import java.sql.Date;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import java.io.*;

public class Monitor {
	
	private String path;
	private int timeout;
	private List<filePlusData> prev = new ArrayList<filePlusData>();
	private List<filePlusData> curr = new ArrayList<filePlusData>();
	private IFileEvents events;

	public Monitor(String path) throws IOException {
		this.path = path;
		createArray(prev);
	}

	public void start() throws IOException {
		while (true) {
			createArray(curr);
			compareArrays(prev, curr);
			prev.clear();
			prev.addAll(curr);
			
			System.out.println("Waiting...");
			try {
				Thread.sleep(timeout);
			} catch (InterruptedException ex) {
				return;
			}
		}
	}

	public int getTimeout() {
		return timeout;
	}

	public void setTimeout(int value) {
		timeout = value;
	}

	public IFileEvents getEvents() {
		return events;
	}

	public void setEvents(IFileEvents value) {
		events = value;
	}

	private void doFileAdded(filePlusData path2) {
		if (events != null)
			events.onFileAdded(path2.getFile());
	}

	private void doFileDeleted(filePlusData path2) {
		if (events != null)
			events.onFileDeleted(path2.getFile());
	}
	
	private void doFileModified(filePlusData path2) {
		if (events != null)
			events.onFileModified(path2.getFile());
	}

	private void compareArrays(List<filePlusData> prev2, List<filePlusData> curr2) throws IOException {
		
		List<filePlusData> tmp = new ArrayList<filePlusData>();
		tmp.addAll(curr2);
		tmp.removeAll(prev2);
		
		if( !(tmp.size()==0)){
			if( curr2.size()>prev2.size())
				doFileAdded(tmp.get(0));
			else {
				doFileModified(tmp.get(0));
			}
						
		return;	
		}
		tmp.clear();
		tmp.addAll(prev2);
		tmp.removeAll(curr2);
		
		if( !(tmp.size()==0)){
			doFileDeleted(tmp.get(0));
			return;
		}
		}
	private void createArray(List<filePlusData> curr2) throws IOException {
		File file = new File(path);
		File[] list = file.listFiles();
		int i=0;
		curr2.clear();
		for (File f : list) {			
			curr2.add(new filePlusData(f.getCanonicalPath()));
		}
	}
}

MyClass

package Monitor2;

import java.io.File;
import java.io.IOException;
import java.sql.Date;

/*Написать монитор, которых хранит дату модификации файлов и
	выводит сообщения при изменении в файлах* .*/

public class MyClass {

    private static class MyEvents implements IFileEvents {
        
    	public void onFileAdded(File path) {
            System.out.println("File added: " + path);
        }
        
        public void onFileDeleted(File path) {
            System.out.println("File deleted: " + path);
        }
        
        public void onFileModified(File f) {
        	Date d = new Date(f.lastModified());
            System.out.println("File "+ f + " мodified: " + d);
        }
    }

    public static void main(String[] args) throws IOException {
        Monitor m = new Monitor("d:\\1");
        m.setTimeout(2000);
        m.setEvents(new MyEvents());
        m.start();
    }
}

wConsol

Waiting...
File added: D:\1\~$D.docx
Waiting...
Waiting...
File added: D:\1\D.docx
Waiting...
File deleted: D:\1\~WRL2710.tmp
Waiting...
Waiting...
Waiting...
File D:\1\D.docx мodified: 2016-03-02
Waiting...
Waiting...
File D:\1\N1.txt мodified: 2016-03-02
Waiting...
Waiting...
File D:\1\n2.txt мodified: 2016-03-02
Waiting...
Waiting...
Waiting...
File deleted: D:\1\n2.txt
Waiting...
Waiting...
Waiting...
Waiting...

yIFileEvents

package Monitor2;

import java.io.File;

public interface IFileEvents {
    void onFileAdded(File path2);
    void onFileDeleted(File path2);
    void onFileModified(File path2);
}