Cannot understand the before function of the Calendar class

Question

I wrote the following code in Eclipse, I think all lines should print

true

, but only the second line print

true

, can anyone explain it to me?

    Date date = new Date();



    Calendar cal = Calendar.getInstance();

    cal.add(Calendar.WEEK_OF_YEAR, -1);



    System.out.println(cal.before(date));

    System.out.println(cal.getTime().before(date));

Answer 1

This is the code of the function Calendar.before(Object when):

public boolean before(Object when) {
        return when instanceof Calendar
            && compareTo((Calendar)when) < 0;
    }

As you can see, it checks if given object is Calendar, and if it is not, like in your case, it returns false.

Cannot understand the before function of the Calendar class

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