Calendar Page
Problem
You want a calendar for a given month of a given year, or of the current month and year.
Solution
Use Calendar.get( )
to find what day of
the week the first of the month falls on, and format accordingly.
Discussion
Like the output of the Unix cal command, it is often convenient to view a month in compact form. The basic idea is to find what day of week the first of the month is and print blank columns for the days of the week before the month begins. Then, print the numbers from 1 to the end of the month, starting a new column after you get to the last day of each week.
Here’s my program, compared to the Unix cal command:
daroad.darwinsys.com$ java CalendarPage 6 2000 June 2000 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 daroad.darwinsys.com$ cal 6 2000 June 2000 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
The source code is simple and straightforward (Example 6-3).
Example 6-3. CalendarPage.java
import java.util.*; import java.text.*; /** Print a month page. * Only works for the Western calendar. */ public class CalendarPage { /** The names of the months */ String[] months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }; /** The days in each month. */ public final static int dom[] = { 31, 28, 31, 30, /* jan feb mar apr */ 31, 30, 31, 31, /* may jun jul aug */ 30, 31, 30, ...
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