Export of particular value from list in Java

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In your approach

List<String> dobList = new ArrayList<>();

    for (Customer customer : customers) {
        dobList.add(customer.getDOB());
    }

In java 8 you can use below code as reference

List<String> dobsList = customersList.stream()
                               .map(Customer::getdob)
                               .collect(Collectors.toList());

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