控制台打印当前月日历

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

public class DateTime {
public static void main(String[] args){
Calendar cld= Calendar.getInstance();
int Day=cld.get(Calendar.DATE);//今天是几号
int FirstDay=getFirstDayInWeek();//调用获取本月第一天是本周第几天函数
int day = getCurrentMonthLastDay();//调用获取当月天数函数
printCalendar(FirstDay,day,Day);//调用打日历方法

}
//获取当月天数的方法
public static int getCurrentMonthLastDay()
{
Calendar cld = Calendar.getInstance();
cld.set(Calendar.DATE, 1);//将今天设为1号
cld.roll(Calendar.DATE, -1);//回滚到本月最后一天
int maxDate = cld.get(Calendar.DATE);
return maxDate;
}
//获取本月第一天是周几
public static int getFirstDayInWeek()
{
Calendar cld = Calendar.getInstance();
cld.set(Calendar.DATE, 1);//将今天设为1号
int firstDay = cld.get(Calendar.DAY_OF_WEEK);
return firstDay;
}
//打印日历
public static void printCalendar(int FirstDay,int day,int Day)
{
Date now=new Date();
System.out.println(now);
SimpleDateFormat DateTime = new SimpleDateFormat("今天是 yyyy年MM月dd日 ");
System.out.println(DateTime.format(now));
String[] Week={"周日","周一","周二","周三","周四","周五","周六"};
for(int i=0;i<Week.length;i++){
System.out.print(String.format("%17s",Week[i]));
}
System.out.println();
int j=0;//换行计数器
while(j<FirstDay-1){
System.out.print("\t");
j++;
}
for(int i = 1 ; i <= day; i++)
{
if(j%7==0){
System.out.println();
}
j++;
if(i!=Day && i!=Day+1 ){
System.out.print(String.format("%8d",i));
}
if(i==Day){
System.out.print(String.format("%8d*",i));
}
if(i==Day+1){
System.out.print(String.format("%7d",i));
}
}
}
}