java关于Data类一些简单操作

最近看了一下，IBM公司的dw上的资料，关于日期类做了一系列的表述，结合参考资料写了点操作

package com.fisher.sample;

import java.text.DateFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * .FileName： DateSample.java 日期设置例子
 * 
 * @author fisher_he
 * @Date 2009-10-13
 * @Description
 * @version 1.00
 * @see others
 */
public class DateSample {
	/**
	 * 对日期进行和设置和分别获取所需要的日期格式部分
	 */
	public static void getAndSetDateTime() {
		Calendar calendar = GregorianCalendar.getInstance();
		calendar.setTimeInMillis(System.currentTimeMillis());
		// 设置时间为2009年 7 月 15 日上午 2 点 15 分 37 秒
		calendar.set(Calendar.MONTH, Calendar.JULY);
		calendar.set(Calendar.DAY_OF_MONTH, 15);
		calendar.set(Calendar.YEAR, 2009);
		calendar.set(Calendar.HOUR, 2);
		calendar.set(Calendar.MINUTE, 15);
		calendar.set(Calendar.SECOND, 37);
		System.out.println(calendar.getTime());
		// 一旦设定好了时期格式后，可以以通过下面几种方式来提取其中一部分
		System.out.println("The YEAR is: " + calendar.get(Calendar.YEAR));
		System.out.println("The MONTH is: " + calendar.get(Calendar.MONTH));
		System.out.println("The DAY is: " + calendar.get(Calendar.DATE));
		System.out.println("The HOUR is: " + calendar.get(Calendar.HOUR));
		System.out.println("The MINUTE is: " + calendar.get(Calendar.MINUTE));
		System.out.println("The SECOND is: " + calendar.get(Calendar.SECOND));
		System.out.println("The AM_PM indicator is: "
				+ calendar.get(Calendar.AM_PM));
		// 设置日期向后推移20天		

		calendar.add(Calendar.DAY_OF_MONTH, 20);

		
		// roll(int field, boolean up) up the month with 1
		// roll(int field, int amount) input num to up the month
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");

		//设置日期向后滚 这种方式默认值为"1”
		calendar.roll(Calendar.MONTH, true);
		System.out.println(formatter.format(calendar.getTime()));
	}
	/**
	 * 通过simpledateformat来自定义日期格式
	 */
	public static void getDIYdate() {
		DateFormatSymbols symbols = new DateFormatSymbols();
		// 月份的符号
		String[] oddMonthAbbreviations = new String[] { "Ja", "Fe", "Mh", "Ap",
				"My", "Jn", "Jy", "Au", "Se", "十月", "No", "De" };
		symbols.setShortMonths(oddMonthAbbreviations);
		SimpleDateFormat formatter = new SimpleDateFormat("MMM dd, yyyy",
				symbols);
		String formattedDate = formatter.format(new Date());
		System.out.println(formattedDate);
		//

	}
	public static void main(String[] args) {
		getAndSetDateTime();
	}

}