英文:
How copy property of ArrayList in another property of other ArrayList with different property name?
问题
将personList中的company的值复制到以下的employeeList中的enterprise，使用Java-8怎么做？
我有：
@Getter
@Setter
public class Person {
private String name;
private String company;
}
和：
@Getter
@Setter
public class Employee {
private String name;
private String enterprise;
}
List<Person> personList;
List<Employee> employeeList;
我不能更改enterprise属性的名称。
英文:
How copy values of company in:
>List<Person> personList
To enterprise of:
>List<Employee> employeeList
With Java-8?
I have:
@Getter
@Setter
public class Person {
private String name;
private String company;
}
And:
@Getter
@Setter
public class Employee {
private String name;
private String enterprise;
}
List<Person> personList
List<Employee> employeeList
I can't change the property name of enterprise.
答案1
得分: 1
假设 Employee 有一个类似于 Employee(String name, String enterprise) 的构造函数。
您可以通过使用 stream().map() 将 Person 对象转换为 Employee，然后在一个列表中收集新的 Employee 实例。
试一试：
List<Employee> employeeList = personList.stream().map(p -> new Employee(p.getName(), p.getCompany()))
.collect(Collectors.toList());
英文:
I assume Employee has a constructor like Employee(String name, String enterprise)
You can convert Person objects to Employee by using stream().map(), then collect new Employee instances in a list.
Try this:
List<Employee> employeeList = personList.stream().map(p -> new Employee(p.getName(), p.getCompany()))
.collect(Collectors.toList());
答案2
得分: 0
你可以使用 Lombok 框架的其他方法，比如 Builder。
另外，你可以创建一个用于将 Person 转换为 Employee 的实用工具类。
而使用 Stream API 的实现将会是：
List<Person> personList = List.of(Person.builder()
.name("name1")
.company("company1")
.build(),
Person.builder()
.name("name2")
.company("company2")
.build());
System.out.println(personList);
List<Employee> employeeList = personList.stream()
.map(EmployeeConverter::convertToEmployee)
.collect(Collectors.toList());
System.out.println(employeeList);
输出:
>[Person(name=name1, company=company1), Person(name=name2, company=company2)]
>[Employee(name=name1, enterprise=company1), Employee(name=name2, enterprise=company2)]
其他代码细节：
@UtilityClass
class EmployeeConverter {
public Employee convertToEmployee(Person person) {
return Employee.builder()
.name(person.getName())
.enterprise(person.getCompany())
.build();
}
}
@Getter
@Setter
@Builder
@ToString
class Person {
private String name;
private String company;
}
@Getter
@Setter
@Builder
@ToString
class Employee {
private String name;
private String enterprise;
}
英文:
You could use some other methods from Lombok framework, like Builder.
Also, you could create a utility class for converting Person to Employee.
And your implementation with Stream API will be:
List<Person> personList = List.of(Person.builder()
.name("name1")
.company("company1")
.build(),
Person.builder()
.name("name2")
.company("company2")
.build());
System.out.println(personList);
List<Employee> employeeList = personList.stream()
.map(EmployeeConverter::convertToEmployee)
.collect(Collectors.toList());
System.out.println(employeeList);
Output:
>[Person(name=name1, company=company1), Person(name=name2, company=company2)]
>[Employee(name=name1, enterprise=company1), Employee(name=name2, enterprise=company2)]
Other code details:
@UtilityClass
class EmployeeConverter {
public Employee convertToEmployee(Person person) {
return Employee.builder()
.name(person.getName())
.enterprise(person.getCompany())
.build();
}
}
@Getter
@Setter
@Builder
@ToString
class Person {
private String name;
private String company;
}
@Getter
@Setter
@Builder
@ToString
class Employee {
private String name;
private String enterprise;
}
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