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

public class ReferenceDemo {
    public static void main(String [] args) {
        File f1 = new File("mydata.txt");
        File f2 = new File("mydata.txt");

        if (f1 != f2) 
            System.out.println("f1 != f2");

        Date today = new Date();
        Date now = today;

        if (today == now)
            System.out.println("today == now");

        String s1 = "Hello";
        String s2 = "Hello";

        if (s1 == s2)
            System.out.println("s1 == s2");

        String x1 = new String("Goodbye");
        String x2 = new String("Goodbye");

        if (x1 == x2)
            System.out.println("x1 == x2");
    }
}