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public class Date {
private int month; // 1-12
private int day; // 1-31 based on month
private int year; // any year
// constructor: call checkMonth to confirm proper value for month;
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.println( "Date object constructor for date " +
toDateString() );
} // 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
System.out.println( "Invalid month (" + testMonth +
") set to 1." );
return 1; // maintain object in consistent state
}
} // end method checkMonth
//=================================================
// utility method to confirm proper day value based on month and year
private int checkDay( int testDay )
{
int daysPerMonth[] =
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
// 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;
System.out.println( "Invalid day (" + testDay + ") set to 1." );
return 1; // maintain object in consistent state
} // end method checkDay
//=================================================
// return a String of the form month/day/year
public String toDateString()
{
return month + "/" + day + "/" + year;
}
} // end class Date |
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public class Employee {
private String firstName;
private String lastName;
private Date birthDate;
private Date hireDate;
public Employee( String first, String last, Date dateOfBirth,Date dateOfHire )
{
firstName = first;
lastName = last;
birthDate = dateOfBirth;
hireDate = dateOfHire;
}
//=========================================
public String toEmployeeString()
{
return lastName + ", " + firstName +
" Hired: " + hireDate.toDateString() +
" Birthday: " + birthDate.toDateString();
}
} // end class Employee |
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import javax.swing.JOptionPane;
public class EmployeeTest {
public static void main( String args[] )
{
Date birth = new Date( 7, 24, 1949 );
Date hire = new Date( 3, 12, 1988 );
Employee employee = new Employee( "Bob", "Jones", birth, hire );
JOptionPane.showMessageDialog( null, employee.toEmployeeString(),
"Testing Class Employee", JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
}
} // end class EmployeeTest |
