Implementing a set method.

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Java

Hello,

I have an order class that has 3 variables, "customer(name of customer)",
"name(name of a requested item)","count(total count of requested item)".

I want to impelement a method in another class that has the method Set<order> getItemSet() that returns a set and joins all requests for the same item from different customers in following way,
for example:
if there are two requests:
- ItemN: Customer1: 3
- ItemN: Customer2: 1
Set of orders should be:
- ItemN: Customer1,Customer2: 4

I was thinking to store orders in a list and iterate over them to check how many requests an item has and then store them in a set for that particular item. But, I am not sure to be honest. I am kind of lost. Any kind of hint or help with implementation would be great.

What I have tried:

public class Order implements Comparable<Order> {
	
	String customer; // Name of the customer
	String name; // Name of the requested item
	Integer count; // Count of the requested items
	
	public Order(String customer, String name, Integer count) {
		super();
		this.customer = customer;
		this.name = name;
		this.count = count;
	}
	
	
	@Override
	public int compareTo(Order arg0) {
		int status;
		status = this.name.compareTo(arg0.name);
		if (status == 0){
			status = this.customer.compareTo(arg0.customer);
			if (status == 0){
				status = this.count - (arg0.count);
			}
		}
		if (status < 0){
			status = -1;
		}
		if (status > 0){
			status = 1;
		}
		return status;
	}
	
	public boolean equals(Object obj){
		if (this == obj){
			return true;
		}
		if (obj == null){
			return false;
		}
		if (getClass() != obj.getClass()){
			return false;
		}
		Order arg0 = (Order) obj;
		if (count != arg0.count){
			return false;
		}
		if (customer == null){
			if (arg0.customer != null)
			return false;
		} else if (!customer.equals(arg0.customer)) 
			return false;
		if (name == null){
			return false;
		}else if (!name.equals(arg0.name)){
			return false;
		}
			return true;
		
	}


	@Override
	public String toString() {
		return "ItemName: "+ name + "OrdererName: "+ customer + " count: " + count ;
	}
	
	
	@Override
	public int hashCode(){
		return (name + customer + count).hashCode();
	}

}

This is the second class where I want to implement the method that returns set.

public class Orders implements Iterator<Order>{
	int index = 0;
	List<Order> orders	
	;
	
	public Orders(){
		index = -1;
		orders = new ArrayList<>();
		
	}
	public void add(Order item){
		orders.add(item);
	}
	public List<Order> getItemsList(){
		return orders;
	}
   <pre>public Set<Order> getItemsSet()
	{
		Set<Order> orderSet = new HashSet<>();
		
		return orderSet;
	}
<pre>@Override
	public void forEachRemaining(Consumer<? super Order> arg0) {
		//  Auto-generated method stub
		
	}

	@Override
	public boolean hasNext() {
		//  Auto-generated method stub
		return false;
	}

	@Override
	public Order next() {
		//  Auto-generated method stub
		return null;
	}

	@Override
	public void remove() {
		//  Auto-generated method stub
		
	}
}