Calendar的简单实用

1.获取本月第一天是星期几

public static void main(String[] args) {Calendar calendar = new GregorianCalendar(2011,9,1);//月份从0开始,0为1月int firstDayInWeek=calendar.get(Calendar.DAY_OF_WEEK);System.out.println("本月第一天是(数字)：" +firstDayInWeek);SimpleDateFormat format = new SimpleDateFormat("E");System.out.println("本月第一天是(星期几)：" + format.format(calendar.getTime())); }

2.获取本月天数

public static void main(String[] args) {Calendar cal = Calendar.getInstance();cal.set(Calendar.MONTH,cal.get(Calendar.MONTH)+1);cal.set(Calendar.DAY_OF_MONTH,1);cal.set(Calendar.DATE,cal.get(Calendar.DATE)-1);System.out.println("当月天数:"+cal.get(Calendar.DAY_OF_MONTH));}

或者public static void main(String[] args) {Calendar cal = Calendar.getInstance();int maxDayOfMon=cal.getActualMaximum(Calendar.DAY_OF_MONTH);;System.out.println("当月天数:"+maxDayOfMon);}

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