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- // Fig. 8.7: Date.java
- // Date class declaration.
- public class Date
- {
- private int month; // 1-12
- private int day; // 1-31 based on month
- private int year; // any year
- private static final int[] daysPerMonth = // days in each month
- { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
- // constructor: call checkMonth to confirm proper value for month;
- // call checkDay to confirm proper value for day
- public Date( int theMonth, int theDay, int theYear )
- {
- month = checkMonth( theMonth ); // validate month
- year = theYear; // could validate year
- day = checkDay( theDay ); // validate day
- System.out.printf(
- "Date object constructor for date %s\n", this );
- } // end Date constructor
- // utility method to confirm proper month value
- private int checkMonth( int testMonth )
- {
- if ( testMonth > 0 && testMonth <= 12 ) // validate month
- return testMonth;
- else // month is invalid
- throw new IllegalArgumentException( "month must be 1-12" );
- // end method checkMonth
- }
- // utility method to confirm proper day value based on month and year
- private int checkDay( int testDay )
- {
- // check if day in range for month
- if ( testDay > 0 && testDay <= daysPerMonth[ month ] )
- return testDay;
- // check for leap year
- if ( month == 2 && testDay == 29 && ( year % 400 == 0 ||
- ( year % 4 == 0 && year % 100 != 0 ) ) )
- return testDay;
- throw new IllegalArgumentException(
- "day out-of-range for the specified month and year" );
- } // end method checkDay
- // return a String of the form month/day/year
- public String toString()
- {
- return String.format( "%d/%d/%d", month, day, year );
- } // end method toString
- } // end class Date
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