Stream toArray(IntFunction generator) example

Description

Stream toArray(IntFunction<A[]> generator) returns an array containing the elements of this stream, using the provided generator function.

import java.util.List;
import java.time.LocalDate;
import java.time.Month;
import java.util.Arrays;
public class Main {
    public static void main(String[] args) {
        List<Employee> persons = Employee.persons();

        Employee[] men = persons.stream()
                .filter(p -> p.getGender() ==Gender.MALE)
                .toArray(Employee[]::new);

      for(Employee employee: men){
            System.out.println("After increasing the income: " + employee);
        }
    }
}

enum Gender { 
  MALE, FEMALE 
}

class Employee {
    private long id;
    private String name;
    private Gender gender;
    private LocalDate dob;
    private double income;

    public Employee(long id, String name, Gender gender, LocalDate dob,
                    double income) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.dob = dob;
        this.income = income;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Gender getGender() {
        return gender;
    }

    public boolean isMale() {
        return this.gender == Gender.MALE;
    }

    public boolean isFemale() {
        return this.gender == Gender.FEMALE;
    }

    public void setGender(Gender gender) {
        this.gender = gender;
    }

    public LocalDate getDob() {
        return dob;
    }

    public void setDob(LocalDate dob) {
        this.dob = dob;
    }

    public double getIncome() {
        return income;
    }

    public void setIncome(double income) {
        this.income = income;
    }

    public static List<Employee> persons() {
        Employee ken = new Employee(1, "Jame", Gender.MALE, LocalDate.of(1970,
                Month.MAY, 4), 6123.0);
        Employee jeff = new Employee(2, "Jeff", Gender.MALE, LocalDate.of(1971,
                Month.JULY, 5), 7112.0);
        Employee donna = new Employee(3, "Jane", Gender.FEMALE, LocalDate.of(1972,
                Month.JULY, 9), 8712.0);
        Employee chris = new Employee(4, "Jodd", Gender.MALE, LocalDate.of(1973,
                Month.DECEMBER, 6), 1823.0);
        Employee laynie = new Employee(5, "Janey", Gender.FEMALE, LocalDate.of(1974,
                Month.DECEMBER, 3), 1234.0);
        Employee lee = new Employee(6, "Jason", Gender.MALE, LocalDate.of(1975, Month.MAY,
                8), 2412.0);
        // Create a list of persons
        List<Employee> persons = Arrays.asList(ken, jeff, donna, chris, laynie, lee);

        return persons;
    }
    @Override
    public String toString() {
        String str = String.format("(%s, %s, %s, %s, %.2f)", id, name, gender, dob,
                income);
        return str;
    }
}

The code above generates the following result.

After increasing the income: (1, Jame, MALE, 1970-05-04, 6123.00)
After increasing the income: (2, Jeff, MALE, 1971-07-05, 7112.00)
After increasing the income: (4, Jodd, MALE, 1973-12-06, 1823.00)
After increasing the income: (6, Jason, MALE, 1975-05-08, 2412.00)