1、Calendar类的概述和获取日期的方法
* A:Calendar类的概述
* Calendar 类是一个抽象类，它为特定瞬间与一组诸如 YEAR、MONTH、DAY_OF_MONTH、HOUR 等日历字段之间的转换提供了一些方法，并为操作日历字段（例如获得下星期的日期）提供了一些方法。
* B:成员方法
* public static Calendar getInstance()
* public int get(int field)
2、Calendar类的add()和set()方法
* A:成员方法
* public void add(int field,int amount)
* public final void set(int year,int month,int date)
例：
public class Demo {
public static void main(String[] args) {
//demo1();
Calendar c = Calendar.getInstance();
// c.add(Calendar.MONTH, -1);
// c.set(Calendar.YEAR, 2008);
c.set(2000,7,8);
System.out.println(c.get(Calendar.YEAR) + "年"
+ getNum(c.get(Calendar.MONTH) + 1) + "月"
+ getNum(c.get(Calendar.DAY_OF_MONTH)) + "日"
+ getWeek(c.get(Calendar.DAY_OF_WEEK)));
}
private static void demo1() {
Calendar c = Calendar.getInstance();
// System.out.println(c);
System.out.println(c.get(Calendar.YEAR));
System.out.println(c.get(Calendar.MONTH));
System.out.println(c.get(Calendar.DAY_OF_MONTH));
System.out.println(c.get(Calendar.YEAR) + "年"
+ getNum(c.get(Calendar.MONTH) + 1) + "月"
+ getNum(c.get(Calendar.DAY_OF_MONTH)) + "日"
+ getWeek(c.get(Calendar.DAY_OF_WEEK)));
}
public static String getWeek(int week) {
String[] arr = { "", "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
return arr[week];
}
public static String getNum(int num) {
// if(num>9){
// return ""+num;
// }else{
// return "0"+num;
// }
return num > 9 ? "" + num : "0" + num;
}
}