View/Hide Sitemap Inline ...

Leveraging Parameter Names

This is where the type alone is not enough to indicate which dependency should be put one or more constructor args. The following component has a need for two of the same type, with some subtly different characteristics.

public class AppleProcessor {
  private Apple dessertApple;
  private Apple cookingApple;
  public inject(Apple dessertApple, Apple cookingApple) {
    this.dessertApple = dessertApple; 
    this.cookingApple = cookingApple; 
  // other methods 
pico.addComponent("dessertApple", GoldenDeliciousApple.class);
pico.addComponent("cookingApple", BramleyApple.class);;
AppleProcessor appleProcessor = pico.getComponent(AppleProcessor.class);

In this case the constructor to AppleProcessor has carefully named parameters - ‘dessertApple’ and ‘cookingApple’. This is picked up on for the two named components GoldenDeliciousApple and BramleyApple also set up in the container.

There are two ways for this to work: