javaAPI(4)之DateFormat,Date,Calendar類的使用創建日曆

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Scanner;

/**
 * 創建日曆
 * @author xasmall
 * 
 */
public class CalendarTest{
    public static void main(String[] args) {
        System.out.println("請按照yyyy-MM-dd格式輸入!");
        Scanner sc=new Scanner(System.in);
        String str=sc.nextLine();
        System.out.println(str);
        sc.close();
        DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date date=dateFormat.parse(str);
            Calendar calendar=new GregorianCalendar();
            calendar.setTime(date);
            int dateSetDay=calendar.get(Calendar.DATE);
            calendar.set(Calendar.DATE, 1);
            int date_day=calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
            int firstDay_from_Sunday=calendar.get(Calendar.DAY_OF_WEEK);
            System.out.println((calendar.get(Calendar.MONTH)+1)+"月第一天爲星期"+(firstDay_from_Sunday-1));
            System.out.println((calendar.get(Calendar.MONTH)+1)+"月有:"+date_day+"天");
            System.out.println("日\t一\t二\t三\t四\t五\t六");
            int j=1;
            for(int k=0;k<firstDay_from_Sunday-1;k++){
                System.out.print('\t');
            }
            for(int i=1;i<=date_day;i++){
                System.out.print(i);
                j++;
                if(i==dateSetDay){
                    System.out.print('*');
                }
                if((j+firstDay_from_Sunday-2)%7==0){
                    System.out.println();
                }
                else{
                    System.out.print('\t');
                }
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }

    }
}