CODEWITHSUNDEEP
java
rodife
rodife

Reputation: 25

Arraylist from text file

I'm trying to create an ArrayList from data like this taken from a text file called price.txt. So the A and the B are the region codes, the integers are the weight in kilos and the double is the price.

A

15  3.50

25  4.50

35  6.70

50  7.20


B

15  4.70

25  7.20

35  8.60

50  10.50

I've created an object to hold the data.

public class CostList {
    private String code; //Holds Region code
    private double weight; //Holds weight
    private double price; //Holds price
}

But I'm having trouble getting my head around reading it from the text file and then inputting from the text file.

Upvotes: 0

Views: 66

Answers (1)

conFusl
conFusl

Reputation: 939

I think it would be better you have an object structure like this (names chosen by myself): 

public class Item {
   private double weight; //Holds weight
   private double price; //Holds price
}

and

public class Region{
   private String name; //Holds region name
   private List<Item> items; //Holds different items for the region (lines in your file)
}

With your solution you have to create for every line an object with the same region, now you have one object for each region, and inside a list with items for this region!

Concerning the file read I would recommend to look at some tutorials like this. You can easily search in google for reading files in java and you will find a lot of different pages with help! If you have trouble with the process you can ask here, but first try for yourself to implement the file - read - operation!

Upvotes: 1

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