interface Salary {
  public double getValue() { ... }
}
class Employee{
    private Salary salary;

    public Salary getSalary(){
        if(!salary.isLoaded())
            salary = new LazySalary(this);
        return salary
    }

    private class LazySalary implements Salary {
      public double getValue() {
         Employee.this.calculateSalary();
         return Employee.this.getSalary().getValue();
      }
    }

    public class ConcreteSalary implements Salary {
      ...
    }

    private void calculateSalary(){
        ... // calcula mesmo o valor
        salary = new ConcreteSalary(value);
    }
}