Java Stream How to - Create Supplier from Method Reference

Question

We would like to know how to create Supplier from Method Reference.

Answer

/*  w  ww . j a  v  a 2  s .  c o m*/
import java.util.Arrays;
import java.util.List;
import java.util.function.Supplier;

public class Main {
  public static void main(String[] args) {
    Supplier<Employee> employeeGenerator = Main::employeeMaker;

    for (int i = 0; i < 10; i++) {
      System.out.println("Employee #" + i + ": " + employeeGenerator.get());
    }
  }

  public static Employee employeeMaker() {
    List<String> names = Arrays.asList("John Doe", "Jane Doe", "Mark Twain",
        "Oliver Twist", "Ferdinand IV");

    return new Employee(names.get((int) (Math.random() * names.size())),
        Math.random() * 20_000);
  }

}

class Employee {
  public String name;
  public double salary;

  Employee(String name, double salary) {
    this.name = name;
    this.salary = salary;
  }

  @Override
  public String toString() {
    return name + ": " + salary;
  }
}

The code above generates the following result.