Integrating 2 different classes

[Farrukh Nadeem]

I have a Date class and Time class. Is it possible to pass Time object inside Date constructor so that toString function gives output as 12/05/2013 06:31:30 ?

[Winston Gutkowski]

farrukh nadeem wrote:I have a Date class and Time class. Is it possible to pass Time object inside Date constructor so that toString function gives output as 12/05/2013 06:31:30 ?

Well, first off, you're confusing two different things: the contents of your object, and how it's displayed.

But in answer to your question, the answer is: Yes. It's your class, so you can do anything you like with it.

The next question though is: Do you want to? And I'm afraid that without seeing the code for your classes, or knowing how you want them to behave, we simply can't answer that.

Winston

[Farrukh Nadeem]

I am following Dietel's Java How to Program...

The Date class is follows:

public class Date {
   private int month; 
   private int day; 
   private int year; 
   private Time2 time;
   private static final int[] daysPerMonth = {
      0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

   public Date(int theMonth, int theDay, int theYear){
	      month	= checkMonth(theMonth ); 
	      year	= theYear; 
	      day	= checkDay(theDay); 
	}
   public Date(int theMonth, int theDay, int theYear, Time2 time){
      month	= checkMonth(theMonth ); 
      year	= theYear; 
      day	= checkDay(theDay); 
      this.time = time;
      System.out.printf( "Date object constructor for date %s\n", this );
   }
   private int checkMonth( int testMonth ) {
      if (testMonth > 0 && testMonth <= 12)
         return testMonth;
      else 
         throw new IllegalArgumentException("month must be 1-12");
   }
   private int checkDay(int theDay) {
      if (theDay > 0 && theDay <= daysPerMonth [month] )
         return theDay;
      if (month == 2 && theDay == 29 && (year % 400 == 0
       || ( year % 4 == 0 && year % 100 != 0)))
         return theDay;
      throw new IllegalArgumentException(
         "day out-of-range for the specified month and year");
   }
   public int incDay () {
	   if (day < daysPerMonth [month])
		   day++;
	   else
		   	incMonth();
	   		day = 1;
	   return day;
   }
   public int incMonth(){
	   if (month == 12){
		   month = 1;
		   year++;
		   return month;
	   }
	   else		   
		   return month++;
	}
   public String toString() { 
	   return String.format( "%d/%d/%d", month, day, year, time ); 
   } 
}

The Time class is :

public class Time2 {
	private int hour;
	private int minute;
	private int second;
	
	public Time2 (){
		this (0,0,0);
	}
	public Time2 (int h){
		this (h,0,0);
	}
	public Time2 (int h, int m){
		this (h,m,0);
	}
	public Time2 (int h, int m, int s){
		setTime (h,m,s);
	}
	private void setTime(int h, int m, int s) {
		setHour( h );
		setMinute ( m );
		setSecond ( s );		
	}	
	private void setSecond(int s) {
		if ( s >= 0 && s < 60 )
			second = s;
		else
			second = 0;
	}
	private void setMinute(int m) {
		if ( m >= 0 && m < 60 )
			minute = m;
		else
			minute = 0;
	}
	private void setHour(int h) {
		if ( h >= 0 && h < 24 )
			hour = h;
		else
			hour = 0;
	}	
	public Time2 (Time2 time){
		this (time.getHour(), time.getMinute(), time.getSecond());
	}
	public int getHour() {
		return hour;
	}
	public int getMinute() {
		return minute;
	}
	public int getSecond() {
		return second;
	}
	public void incSecond (){
		if ( second == 59 ){
			second =  0 ;
			incMinute();			
		}
		else
			setSecond( second + 1 );
	}
	public void incMinute(){
		if ( minute == 59 ){
			minute = 0;
			incHour();			
		}
		else
			setMinute ( minute + 1 );
	}
	public void incHour (){
		if( hour == 23 ){
			setHour( 0 );
		}
		else
			setHour ( hour + 1 );
	}
	public String toUniversalString(){
		return String.format ("%02d:%02d:%02d",getHour(),getMinute(),getSecond());
	}
	public String toString(){
		return String.format("%02d:%02d:%02d %s",
				(( getHour() == 0 || getHour() == 12 ) ? 12 : getHour() % 12 ),
				getMinute(), getSecond(), (getHour() < 12  ? "AM" : "PM"));
	}
}

Now struck at Main class is:

public class DateTimeTest {

	public static void main(String[] args) {
		Date date = new Date (12,5,1966,11,11,02);
		System.out.println(date);
	}
}

[Winston Gutkowski]

farrukh nadeem wrote:Now struck at Main class is:...

Well that doesn't look like it will work, because you don't have a constructor that takes 6 integers.

What about:
Date date = new Date( 12, 5, 1966, new Time2(11,11,02) );
?

That said, I don't really see the point of including a Time in a Date class. If it was me, I think I'd keep the two completely separate, and add a Timestamp class, that wraps one of each.

Winston

[Farrukh Nadeem]

As already stated I am following Dietel's book. So far, I have not seen Timestamp class till chapter 9. Will work on your example.
Regards

[Farrukh Nadeem]

"Date date = new Date( 12, 5, 1966, new Time2(11,11,02) ); "

this gave me date print only. any further suggestions?

[Winston Gutkowski]

farrukh nadeem wrote:this gave me date print only. any further suggestions?

Well, I already gave you one, but it doesn't seem to follow the edicts of your book (which I'm not familiar with). What exactly do you want "suggestions" about?

Winston

[Steve Fahlbusch]

this gave me date print only. any further suggestions?

Well first i suggest that you read the javadocs for String.format(), look at the Date.toString() method and let us know what you would expect to be output, given the information from the javadocs.

-steve

[Farrukh Nadeem]

I dropped this exercise of the book and moved on. Will see it later.
And thanks for your help.
Regards