Dependency Injection Example

DependencyInjectionExample.java

// no DI
public class Refrigerator {
  private PowerSource powerSource;
  
  public Refrigerator() {
    powerSource = new AcPowerSource();
  }
}

// with DI (manual)
public class Refrigerator {
  private PowerSource powerSource;
  
  public Refrigerator(PowerSource powerSource) {
    this.powerSource = powerSource;
  }
}