CODEWITHSUNDEEP
javajavafx
john8674
john8674

Reputation: 11

Getting specific elements from arraylist

I have a resturant system using java fx, when a customer orders that order is added to the 'customer' class. The customer is then added to the 'table' class.

At the end im trying to display each individual customers order by looping through an array list of them and i cant figure out the syntax

an arraylist called allcustomers is set like this

allcustomers = tbl.getCustomers();

printed out it looks like this

[Customer{customernumber=null, customerorder=[burger'7.99]}]

im trying to loop through the 'allcustomers' arraylist and just get the food items but im unsure how how?

this is the full code

public class PaymentScreenController {


    public ArrayList<Customer> allcustomers;

    public Customer cus1;
    public ArrayList cusarray;


    private Table tbl = new Table();

    @FXML
    public void initialize() {

        allcustomers = tbl.getCustomers();




        // Unsure about how to do this for loop
        for (  : allcustomers) {




        }

any help would be appreciated thanks

Upvotes: 0

Views: 151

Answers (4)

NigarMovsumova
NigarMovsumova

Reputation: 1

As I see, Customer has ArrayList of orders nested inside of a Customer object. So, first you need to iterate over all customers in allCustomers and then iterate over all orders in customerOrder list. Star output is used to separate orders from each customer.

for (Customer customer : allCustomers) {
        System.out.println("*****")
        for(String singleOrder: customer.customerOrder){
            System.out.println(singleOrder);
      }
    }

Also, you can do it like this :

for (Customer customer : allCustomers) {
        System.out.println("*****")
        System.out.println(Arrays.toString(customer.customerOrder));
    }

Upvotes: 0

user
user

Reputation: 7604

Enhanced for loops are used like this:

for (Customer customer : allCustomers) {
   //To display the customer's order or some other attribute
   System.out.println(customer.customerOrder);
}

With an indexed for loop:

for (int i = 0; i < allCustomers.size(); i ++) {
  Customer customer = allCustomers.get(i);
  System.out.println(customer.customerOrder);
  //This could be turned into one line, but shows how you index in ArrayLists
}

See the comment by LinuxServer below for a cooler version that uses streams to go through the list.

Upvotes: 1

Chik3r
Chik3r

Reputation: 380

for (Customer customer : allcustomers) { // Iterate through all customers
  print("Customer Number: " + customer.customernumber); // Print Customer Number
  print("Customer Order: " + customer.customerorder.toString()); // Print the order array
}

Using a normal for loop

for (int i = 0; i < allcustomers.length; i++) {
  print("Customer Number: " + allcustomers[i].customernumber); // Print Customer Number
  print("Customer Order: " + allcustomers[i].customerorder.toString()); // Print the order array
}

Upvotes: -1

Jerome Wolff
Jerome Wolff

Reputation: 377

Here are some examples for solving your problem.

For-each loop

for (Customer customer : allCustomers) {
      //...
 }

indexed for loop

for (int i = 0; i < allCustomers.size(); i++) {
  Customer customer = allCustomers.get(i);
  //...
}

Streams (JDK 8 >)

allCustomers.stream().filter(customer -> /*some condition here*/).forEach(customer -> {
  //...
});

I hope it's helpful.

Upvotes: 1

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