Lambda (Java 8) - Transfer one type of object to another type of object

We will assume that we have list of Students to convert into list of Persions.

public class Student {
    private String name;
    private String school;
    private int age;

    public Student(String name, String school, int age) {
        this.name = name;
        this.school = school;
        this.age = age;
    }

    // getters/setters should come here

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", school='" + school + '\'' +
                ", age=" + age +
                '}';
    }
}

public class Person {
    private String fullName;
    private int age;

    public Person(String fullName, int age) {
        this.fullName = fullName;
        this.age = age;
    }

    //getters/setters should come here

    @Override
    public String toString() {
        return "Person{" +
                "fullName='" + fullName + '\'' +
                ", age='" + age + '\'' +
                '}';
    }
}

In this article, I'm going to use functional interface call Funcation to achieve this.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;

public class StudentApplication {
    public static void main(String[] args) {
        Function<Student, Person> functionStuToPer = student -> new Person(student.getName(), student.getAge());

        List<Student> students = Arrays.asList(
                new Student("Tharanga", "UOC", 22),
                new Student("Ruwan", "UOM", 24),
                new Student("Ruvini", "UOK", 20),
                new Student("Randika", "TOUC", 25),
                new Student("Amara", "UOR", 23)
        );

        List<Person> persons = convertStudentListToPerson(students, functionStuToPer);
        persons.forEach(System.out::println);

    }

    private static List<Person> convertStudentListToPerson(List<Student> students, Function<Student, Person> functions) {
        List<Person> persons = new ArrayList<>();
        for (Student student: students) {
            persons.add(functions.apply(student));
        }
        return persons;
    }
}

Enjoy...!!