How to assign and store value of element from one arraylist to another in java

Question

I have output from data in ArrayList, I have below two ArrayList, where the price of first ArrayList in second ArrayList. I want to use the price for particular items to calculate the bill with some formula. I want to store the value eg. Apple=200.

Formula: Bill = Apple + (10 * Cake)

I have used HashMap.I have never used HashMap before. Or is there any other way to store values?

    ArrayList<String> name = {Apple, Cake, ice-cream, Milk, Burger, Eggs}
        ArrayList<String> values = {200, 350, 75, 80, 200, 100}
        HashMap<List<String>, ArrayList<String>> nameWithvalues = new HashMap<>();
                nameWithvalues.put(name, values);

Output

nameWithvalues :{[Apple, Cake, ice-cream, Milk, Burger, Eggs]=[200, 350, 75, 80, 200, 100]}

Map<String, Integer> map = new HashMap<>(); since you want to put each item individually, right? — SSC
– SSC, Commented Sep 28, 2020 at 10:31

Umesh Sanwal · Accepted Answer · 2020-09-28 10:35:24Z

2

You can start a loop and put the values from both the arrayList . Value from first arrayList will be the key and other will be the value

HashMap<String , Integer> nameWithvalues = new HashMap<>();

for(int i=0 ; i < name.length() ; i++ )
 {
  nameWithvalues.put(name.get(i), values.get(i));
 }

answered Sep 28, 2020 at 10:35

Umesh Sanwal

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3 Comments

SSC Over a year ago

Make sure to check for IndexOutOfBounds exception.

kodu_ Over a year ago

@Umesh Sanwal, Thanks I got values in {{Apple=200, Cake=350}, But how can I use in my Formula? like; int bill = Apple + (10 * Cake); ??

Umesh Sanwal Over a year ago

int bill = nameWithvalues.get("Apple") + (10 * nameWithvalues.get("Cake));

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