package org.fun.classdemo;import java.util.Calendar;import java.util.GregorianCalendar;public class DateTime {	private Calendar calendar = new GregorianCalendar(); // 实例化Calendar对象	public String getDate() {// 2014-07-30		StringBuffer buf = new StringBuffer();		buf.append(calendar.get(Calendar.YEAR)).append("-");		buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)).append(				"-");		buf.append(this.addZero(calendar.get(Calendar.DAY_OF_MONTH), 2));		return buf.toString();	}	public String getDateTime() {// 2014-07-30 10:19:34.123		StringBuffer buf = new StringBuffer();		buf.append(this.getDate()).append(" ");		buf.append(this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2)).append(				":");		buf.append(this.addZero(calendar.get(Calendar.MINUTE), 2)).append(":");		buf.append(this.addZero(calendar.get(Calendar.SECOND), 2)).append(".");		buf.append(this.addZero(calendar.get(Calendar.MILLISECOND), 3));		return buf.toString();	}	public String getDateComplete() {// 2014年07月30日		StringBuffer buf = new StringBuffer();		buf.append(calendar.get(Calendar.YEAR)).append("年");		buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)).append(				"月");		buf.append(this.addZero(calendar.get(Calendar.DAY_OF_MONTH), 2))				.append("日");		return buf.toString();	}	public String getDateTimeComplete() {// 2014年07月30日10时19分34秒123毫秒		StringBuffer buf = new StringBuffer();		buf.append(this.getDateComplete());		buf.append(this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2)).append(				"时");		buf.append(this.addZero(calendar.get(Calendar.MINUTE), 2)).append("分");		buf.append(this.addZero(calendar.get(Calendar.SECOND), 2)).append("秒");		buf.append(this.addZero(calendar.get(Calendar.MILLISECOND), 3)).append(				"毫秒");		return buf.toString();	}	private String addZero(int temp, int len) {		StringBuffer str = new StringBuffer();		str.append(temp);// 增加数字		while (str.length() < len) {			str.insert(0, 0); // 在第一个位置加上字母0		}		return str.toString();	}	public static void main(String args[]) {		System.out.println(new DateTime().getDate());		System.out.println(new DateTime().getDateTime());		System.out.println(new DateTime().getDateComplete());		System.out.println(new DateTime().getDateTimeComplete());	}}