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


public class VisualCalendar
{
	public static void main(String[] args) throws Exception
	{
		System.out.println("請輸入日期 （格式yyyy-MM-dd） : ");
		Scanner scanner = new Scanner(System.in);
		String inputDate = scanner.nextLine();
		
		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Date date = format.parse(inputDate);
		
		Calendar calendar = new GregorianCalendar();
		calendar.setTime(date);
		calendar.set(Calendar.DATE,1);
		
		int sumDays = calendar.getActualMaximum(Calendar.DATE);
		System.out.println("日\t一\t二\t三\t四\t五\t六");
		
		for(int i=1;i<calendar.get(Calendar.DAY_OF_WEEK);i++)
		{
			System.out.print("\t");
		}
		
		for(int i=1;i<=sumDays;i++)
		{
			System.out.print(i+"\t");
			if(calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY)
			{
				System.out.println();
			}
			calendar.add(Calendar.DATE,1);
		}
	}
}
 

執行結果如下：