java - 根据subDTO内的属性值从ArrayList中搜索objectDTO

Question

根据另一个 subDTO 的属性值从 arraylist 搜索元素的最佳方法是什么。

Scenario: I have Employee Object, it has another ContactDetails Object. I need to find Employee from list of Employees whose ext extNumber is 1234 (extNumber is attribute inside ContactDetails. I need to check if the ext is available while creating the new employee and allocating the new ext.

can't use the JDBC query directly as I am consuming corba api. Don't have any corba api that provides such search.

DTO 有另一个 subDto。

public class Employee {
  private String name;
  private ContactDetails contact;
}

public class ContactDetails {
  private String number;
}

How I am doing it currently: I am looping over the list and check the extNumber like below

public boolean isTelephoneExtAvailable(String telephoneExt, List<Employee> employeeList) {
        boolean isAvailable = true;
        if(null != employeeList) {
        Iterator<Employee> itr = employeeList.iterator();
        while(itr.hasNext()){
            employeeList emp = itr.next();
            ContactDetails  contact = emp .getContactDetails();
            if(null != contact && null != contact.getNumber()){
                if(contact.getNumber().equals(telephoneExt)){
                    isAvailable = false;
                    break;
                }
            }
        }
    return isAvailable;
}

有没有更好的优化方法来实现这一点？

Answer 1

如果你可以使用 Java 8，那么我会这样做(来自 apache commons 的 StringUtils):

return !employeeList.stream().anyMatch(employee -> 
              employee.getContactDetails()!=null && 
              StringUtils.equals(telephoneExt, employee.getContactDetails().getNumber()))