Java学习----日期函数

public class TestDate {
    private Date date;
    Calendar calendar;
    
    public TestDate() {
        //date = new Date();
        //Date date2 = new Date();
        //System.out.println(date.after(date2)); // date 是否比  date2晚  false
        
        calendar = Calendar.getInstance();
        System.out.println(calendar.get(Calendar.WEEK_OF_YEAR));
        
        System.out.println(calendar.get(Calendar.YEAR) + "-" + 
        (calendar.get(Calendar.MONTH) + 1) + "-" + 
        (calendar.get(Calendar.DATE)));
        
    }
    
    public static void main(String[] args) {
        TestDate testDate = new TestDate();
    }
}

3
2016-1-13