使用Java Streams在单个对象中合并/连接2个属性/字段(名字+姓氏

在Java Streams中，可以使用map()函数将一个对象的两个属性/字段（名字+姓氏）合并/连接起来。下面是一个完整的示例代码：

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

class Person {
    private String firstName;
    private String lastName;

    public Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }
}

public class Main {
    public static void main(String[] args) {
        List<Person> persons = Arrays.asList(
                new Person("John", "Doe"),
                new Person("Jane", "Smith"),
                new Person("Bob", "Johnson")
        );

        List<String> fullNameList = persons.stream()
                .map(person -> person.getFirstName() + " " + person.getLastName())
                .collect(Collectors.toList());

        System.out.println(fullNameList);
    }
}

运行结果将输出合并后的完整姓名列表：