Bean Factories

Static Factory Methods

Static factory methods are used to create a bean using business logic as well as arguments. This is a well-documented design pattern around private constructors.

public class Organization {
	
  private String companyName;
  private int yearOfIncorporation;
	
  private Organization(String companyName, int yearOfIncorporation) {
    this.companyName = companyName;
    this.yearOfIncorporation = yearOfIncorporation;
  }
	
  public static Organization createInstance(String companyName, int yearOfIncorporation) {
    System.out.println("Invoking static factory method");
    return new Organization(companyName, yearOfIncorporation);
  }
  ...
}

Instance Factory Method

This manner of instantiation involves a dedicated class that will return the instance of the desired object. This is just like Static Factory Methods (above) but it requires two classes.

public class OrganizationFactory {
  public void getInstance(String companyName, int yearOfIncorporation) {
    System.out.println("Invoking instance factory method");
    return new Organization(companyName, yearOfIncorporation);
  }
}