import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.GregorianCalendar;public class Work2 {	/**	 * @param args	 */public static void main(String[] args) {				//变动时间：用来打印		GregorianCalendar change=new GregorianCalendar();		for (int i = 0; i < 12; i++) {			change.set(GregorianCalendar.YEAR, 2013);			change.set(GregorianCalendar.MONTH, i);			change.set(GregorianCalendar.DAY_OF_MONTH, 1);			//打印月份			System.out.println((i+1)+"月"+"\n"+"-----------------------------------------------------");			//打印抬头			System.out.println("日\t一\t二\t三\t四\t五\t六");						//打印空列			int num=change.get(GregorianCalendar.DAY_OF_WEEK);			printNullCol(num-1);						//打印具体某一天			while(getMonth(change)==(i)){								//打印当前的天				System.out.print(getDay(change)+"\t");								//换行				if(change.get(GregorianCalendar.DAY_OF_WEEK)==7){					System.out.println();				}				//累加天				change.add(GregorianCalendar.DAY_OF_MONTH, 1);							}			System.out.println();					}		}									/*	 * 根据GregorianCalendar得到Day	 */	public static int getDay(GregorianCalendar gc){		return gc.get(GregorianCalendar.DAY_OF_MONTH);	}	/*	 * 根据GregorianCalendar得到Month	 */	public static int getMonth(GregorianCalendar gc){		return gc.get(GregorianCalendar.MONTH);	}		/*	 * 打印空列	 */	public static void printNullCol(int num){		for (int i = 0; i < num; i++) {			System.out.print("\t");		}			}}