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For Loop Issue - Java | Dream.In.Code


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    3 Replies - 57 Views - Last Post: Yesterday, 07:02 AM Rate Topic: -----

    #1 RourkeOkeffe ?Icon User is offline

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    Posted Yesterday, 06:38 AM

    My issue is that I want to add a new Pile to the currentTrolley.And I want only to Pile p to the list of piles in the first Trolley.Any help would be appreciated. Currently it is adding Pile p to every trolley
    
for (int i = 0; i < toBeSorted.size(); i++) { 			Parcel currentParcel = toBeSorted.get(i); 			System.out.println(currentParcel);  			for (int j = 0; j < trolleys.size(); j++) { 				Trolley currentTrolley = trolleys.get(j); 				System.out.println(currentTrolley); 					if(currentTrolley.piles.size()<1){ 					 					Pile p = new Pile(0, 0, 0); 					currentTrolley.piles.add(p); 					System.out.println(currentTrolley.piles); 					} 					else 					{ 						System.out.println("Something is here"); 						 					} 					} 					 					 					 					 				}  			} 		 	


    Is This A Good Question/Topic? 0

    Replies To: for loop issue

    #2 jon.kiparsky ?Icon User is offline

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    Re: for loop issue

    Posted Yesterday, 06:49 AM

    Your question is not altogether clear, but when I look at your code, I see a nested loop over two apparently independent collections. What this means is that if you have n items in toBeSorted, you're going to apply the inner loop to each Trolley in tolleys n times - that may not be what you want.

    Without understanding the relationships between Trolleys and Parcels and Piles and whatnot, it's hard to see what you're after here. If that clue about the nested loops didn't do the work, maybe you can explain what you're trying to do.


    #3 andrewsw ?Icon User is online

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    Re: for loop issue

    Posted Yesterday, 06:53 AM

    View Postjon.kiparsky, on 06 May 2013 - 01:49 PM, said:

    Your question is not altogether clear, but when I look at your code, I see a nested loop over two apparently independent collections. What this means is that if you have n items in toBeSorted, you're going to apply the inner loop to each Trolley in tolleys n times - that may not be what you want.

    Without understanding the relationships between Trolleys and Parcels and Piles and whatnot, it's hard to see what you're after here. If that clue about the nested loops didn't do the work, maybe you can explain what you're trying to do.


    I was about to say the same :). Additionally, you state that you want to add something to the first trolley; in which case, it doesn't make sense to loop through all the trolleys.

    #4 jon.kiparsky ?Icon User is offline

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    Re: for loop issue

    Posted Yesterday, 07:02 AM

    View Postandrewsw, on 06 May 2013 - 08:53 AM, said:

    you state that you want to add something to the first trolley; in which case, it doesn't make sense to loop through all the trolleys.

    Yes, this is what I was trying to imply. Perhaps "this may not be what you want" is a little more diplomatic than is required. :)


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