Thread: Help on this class. Almost done

In my class we each have a class my part is this:

Game
-String opponent
-Date date
-----------------------------------------------------------------------------------------------------------------
+Game(String opp, int month, int day, int year, int hours, int min)
+String getOpponent()
+void setOpponent(String opp)
+Date getDate()
+void setDate(int month, int day, int year, int hours, int min)
+String toString()
+boolean equals(Object o) //both field equal
+int compareTo(Object o) //ordered by date

-------------------------------------------------------------

Im not sure how to get the date to work the way that its suppose to in the UML diagram and also need help with the compareTo

this is what I have:

 
import java.util.Date;
 
 
public class Game {
private String opponent;
Date date;
 
 
Game(String opponent, int month, int day, int year, int hours, int min){
	this(opponent, date);
}
//getter & setter opponent
public String getOpponent() {
	return opponent;
}
public void setOpponent(String opponent) {
	this.opponent = opponent;
}
//get date and set date
Date getDate(){
	return date;
}
 
public void setDate(int month, int day, int year, int hours, int min) {
	this.date = date;
}
 
public String toString(){
	return "The date and time of the game is " + date;
}
public int compareTo(Game temp){
	return this.getDate() - temp.getDate();
	}
// equals
public boolean equals (Object o){
	if( o instanceof Game){
		Game temp = (Game)o;
		return this.getOpponent().equals((temp.getOpponent())) && this.getDate() == temp.getDate();}
	 else {return false;}
 
 
}
}

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adjusted it thanks

You can't just use the - operator for things that aren't primitives. (The String class lets you use the + operator but that's beside the point.)


This isn't C++.

You can't subtract one Date from another that way.

For another issue, Date class is mostly deprecated now in the way you're using it. Use the Calendar (Java Platform SE 7 ) class instead.

so how do I write this part

Game(String opponent, int month, int day, int year, int hours, int min){
	this(opponent, date);
}

Im getting the error on date and I understand kind of what you are saying. I just have to do it by following the uml that was provided but im confused by the int parameters or what im suppose to do in the game constructor

when it comes to the compare to im suppose to use it to order them by date which im not sure how to do that. Obviously getting an error there

Call your setter methods.

setOpponent(opponent);

in your constructor.

You will need to construct a new date object using your five int params and pass it to your setDate() method.

Calendar class has a compareTo() method.

You can't call Calendar constructor directly but you can get a Calendar object by calling one of the static getInstance() methods, preferably the no param one.

As I don't see a boolean field for A.M./P.M. in your UML, I'm assuming you're using military time (i.e. 0:00 - 23:59) for hours.

If so, then you can use your new Calendar object and call

set(int year, int month, int day, int hourOfDay, int minute);

Note that the you use the value 0 for the month of January and so on up to 11 for December.

Then you can use your Calendar object to call setDate() with it as a parameter.