compareTo 日期對比

    @Test
    public void myStream08(){
        Calendar c = Calendar.getInstance();
        c.set(2016,5,4);
        Date before =c.getTime();
        c.set(2016,5,5);
        Date now=c.getTime();
        c.set(2016,5,6);
        Date after=c.getTime();
        int compareToBefore=now.compareTo(before);
        System.out.println("compareToBefore = "+compareToBefore);
        // 1
        int compareToIntNow=now.compareTo(now);
        System.out.println("compareToIntNow = "+compareToIntNow);
        // 0
        int compareToIntAfter=now.compareTo(after);
        System.out.println("compareToIntAfter = "+compareToIntAfter);
        // -1
    }