How to modify an element in Array list

Question

I have created the below arrayLIST . I want to modify the phone number of [email protected]. Can you please let me know how to modify it. Thanks in advance

 private static List<Customer> customers;
{
    customers = new ArrayList();
    customers.add(new Customer(101, "John", "Doe", "[email protected]", "121-232-3435"));
    customers.add(new Customer(201, "Russ", "Smith", "[email protected]", "343-545-2345"));
    customers.add(new Customer(301, "Kate", "Williams", "[email protected]", "876-237-2987"));

}

docs.spring.io/spring-framework/docs/current/javadoc-api/org/… ? — CollinD
– CollinD, Commented Mar 10, 2017 at 16:55
you have to have a customer dao method for update, then get customer based on id, and then update the fields passed by patch. — Eddie Martinez
– Eddie Martinez, Commented Mar 10, 2017 at 16:58
customers.get(0).setPhoneNumber("xxx-xxx-xxxx"); assuming Customer class has getters and setters. — PKey
– PKey, Commented Mar 10, 2017 at 17:19

Sean Patrick Floyd · Accepted Answer · 2017-03-10 17:21:29Z

3

With Java 8 streams, use a predicate to find the customer, and Optional.ifPresent() to update the value.

customers.stream()
         .filter(customer -> "[email protected]".equals(customer.getEmail()))
         .findFirst()
         .ifPresent(customer -> customer.setPhoneNumber(2222222));

answered Mar 10, 2017 at 17:21

Sean Patrick Floyd

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Comments

ZhekaKozlov · Accepted Answer · 2017-03-10 17:32:20Z

2

Assuming you have getters and setters, loop through the list and update the phone number when the e-mail matches the one you want

for (Customer customer : customers){
    if (customer.getEmail().equals("[email protected]")){
        customer.setPhoneNumber("xxx-xxx-xxxx");
    }
}

edited Mar 10, 2017 at 17:32

ZhekaKozlov

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answered Mar 10, 2017 at 17:31

pratikpncl

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Comments

user_3380739 · Accepted Answer · 2017-03-12 22:53:39Z

0

Similar with the solution provided by @Sean Patrick Floyd, if you want want to modify all the customers with email "[email protected]":

customers.stream().filter(e -> "[email protected]".equals(e.getEmail()))
                  .forEach(e -> e.setPhoneNumber("xxx-xxx-xxxx"));

answered Mar 12, 2017 at 22:53

user_3380739

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