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Anna
Java Increment Date.
1 Answer(s)      4 years and 4 months ago
Posted in : Java Beginners


Create a program called Date.java to perform error-checking on the initial values for instance: fields month, day and year. Also, provide a method nextDay() to increment the day by one. The Date object should always remain in a consistent state. Write a program that tests the nextDay method in a loop that prints the date during each iteration of the loop to illustrate that the nextDay method works correctly. Test the following cases:

a) incrementing into the next month.

b) incrementing into the next year

What I have so far:
public class Date {

private int day; // 1-31
private int month; // 1-12
private int year; // The year!

// Get Methods
// get the Day
public int getDay()
{
return day;
}

// get the Month
public int getMonth()
{
return month;

}

// get the Year
public int getYear()
{
return year;

}

// Set Methods.
public void setTime( int d, int m, int y )
{
setDay( d ); // set the day
setMonth( m ); // set the month
setYear( y ); // set the year
}

private void setDay(int d) {
}
public Date() { setDay( 07, 20, 2010 ); }

// Time3 constructor: day, month and year supplied.
public Date( int d, int m, int y ) { setDay( d, m, y ); }

// set the day
public void setDay( int d, int i, int j )
{ day = ( ( d >= 0 && d < 32 ) ? d : 0 ); }

// set the month
public void setMonth( int m )
{ month = ( ( m >= 0 && m < 12 ) ? m : 0 ); }

// set the year
public void setYear( int y )
{ year = ( ( y >= 0 && y > 0 ) ? y : 0 ); }

// Change day to next day!
public void nextDay()
{
setDay( day + 1 );
if ( day == 0, day<=31 )
nextDay();
}

// Increment the Month
public void incrementMonth()
{
setMonth( month + 1 );

if ( month == 0, month <12 )
incrementMonth();
}

// Increment the Year
public void incrementYear()
{
setYear( year + 1 );
}
// Convert to String in standard-date format
public String toString()
{
return ( ( month == 12 || month == 0 ) ? 12 : month % 12 ) +
"/" + ( day < 31 ) + year +
"/" + ( year > 0 );
}
}

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View Answers

July 23, 2010 at 12:01 PM


Hi Friend,

Try the following code:

public class Date {

private final int month;
private final int day;
private final int year;

public Date(int m, int d, int y) {
if (!increment(m, d, y))
throw new RuntimeException("Invalid");
month = m;
day = d;
year = y;
}
private static boolean increment(int m, int d, int y) {
int[] DAYS = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if (m < 1 || m > 12)
return false;
if (d < 1 || d > DAYS[m])
return false;
if (m == 2 && d == 29 && !isLeapYear(y))
return false;
return true;
}
private static boolean isLeapYear(int y) {
if (y % 400 == 0)
return true;
if (y % 100 == 0)
return false;
return (y % 4 == 0);
}
public Date next() {
if (increment(month, day + 1, year))
return new Date(month, day + 1, year);
else if (increment(month + 1, 1, year))
return new Date(month + 1, 1, year);
else
return new Date(1, 1, year + 1);
}
public String toString() {
return day + "-" + month + "-" + year;
}
public static void main(String[] args) {
Date today = new Date(9, 30, 2010);
System.out.println(today);
for (int i = 0; i < 35; i++) {
today = today.next();
System.out.println(today);
}
}
}

Thanks


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