How can I loop and compare the data present between two arrays in spring boot

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I have two arrays which both have data, what I want to do is to loop through each array and compare the data between the arrays one array is coming from the Post Method and another array has data from the database, so the comparison has to be done to check if the data is present in database to be updated else it should be inserted as a new a record.

What I have tried:

Below is my code snapshot

@Autowired
private OrderRepository orderRepository; 


public void process_data(String ordercode, List<Order> order) {
                
List<Order> orderList = new ArrayList<>(); 
List<Order> orderData = orderRepository.findOrder(ordercode);

// here is where I want to compare the data between two array lists of order and orderData
   using a for loop

for(var data : order) {  // here is only one array present how can I add the second array list so that I can compare the data present between the two array lists

}

Posted 10-Mar-24 20:48pm

Office Systems

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Pete O'Hanlon · Accepted Answer · 2024-03-10T21:02:00

As I don't know what Order looks like, I'm going to make some assumptions in this answer. The big assumption I'm going to make is that you have an Integer id value in the class, which I can get using getId();. I'm also going to assume that the value is fixed - in other words, once the id has been applied, it's completely immutable and that's the value that would be saved to the database.

Now, if you really have to get your data like this, then I would be looking to use the filter capability in Java. Something like this:

Java

private Optional<Order> findOrder(List<Order> orders, Order order) {
  return orders.stream().filter(f -> f.getId() == order.getId()).findAny();
}

Then you would call this inside your loop like this

Java

Optional<Order> foundOrder = findOrder(orderData, data);
if (foundData.isPresent()) {
  // Do whatever you need to with this missing record.
}

Without more information, I can't really give you a more optimised solution.