boss.java~1~

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

import java.util.*;

public class Boss extends Employee {
  Vector employees; 
  
  public Boss(String _name, float _salary) {
  super(_name, _salary);
  leaf = false;
  employees = new Vector();
  }
//--------------------------------------
  public Boss(Employee _parent, String _name, float _salary) {
    super(_parent, _name, _salary);
    leaf = false;
    employees = new Vector();
   }
  //--------------------------------------
   public boolean add(Employee e) throws NoSuchElementException {
     employees.add(e); 
     return true;
   }
   //--------------------------------------
   public void remove(Employee e) throws NoSuchElementException {
     employees.removeElement(e);
    }
   //--------------------------------------
   public Enumeration subordinates () {
      return employees.elements ();
   }
   //--------------------------------------
   public Employee getChild(String s) throws NoSuchElementException {
      
   Employee newEmp = null;

   if(getName().equals(s))
      return this;
   else
   {
      boolean found = false;
      Enumeration e = subordinates();
      while(e.hasMoreElements() && (! found))
      {  
         newEmp = (Employee)e.nextElement();
         found = newEmp.getName().equals(s);
         if (! found)
            {
            if (! newEmp.isLeaf ()) {
            newEmp = newEmp.getChild(s);
            }
            else
                  newEmp = null;
            found =(newEmp != null);
            }
      }
      if (found) 
         return newEmp;
      else
         return null;
    }
   }
    //--------------------------------------
   public float getSalaries()
   {
      float sum = salary;
      for(int i = 0; i < employees.size(); i++)
      {
         sum += ((Employee)employees.elementAt(i)).getSalaries();
      }
      return sum;
   }


}