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

public class Main {
    public static void main(String[] args) {
        File file = new File("C://FileIO//demo.txt");
        System.out.println("Last modified time: " + new Date(file.lastModified()));
    }
}

Last modified time: Fri Apr 10 11:09:19 CST 2015