1. // 公司类
    2. public abstract class Company {
    4.     protected String name;
    6.     public Company(String name) {
    7.         this.name = name;
    8.     }
    10.      public abstract void Add(Company c);
    11.      public abstract void Remove(Company c);
    12.      public abstract void Display(int depth);
    13.      public abstract void LineOfDuty(); // 履行职责
    15. }
    16. // 为组合中对象声明接口
    17. public abstract class Component {
    19.      protected String name;
    21.      public Component(String name){
    22.          this.name=name;
    23.      }
    25. // 通常用Add和Rmove方法来提供增加或移除树叶或树枝功能
    26.      public abstract void Add(Component c);
    27.      public abstract void Remove(Component c);
    28.      public abstract void Display(int depth);
    29. }
    30. // 具体公司类，实现接口，树枝节点
    31. public class ConcreteCompany extends Company{
    33.     private ArrayList<Company> childern=new ArrayList<Company>();
    35.     public ConcreteCompany(String name) {
    36.         super(name);
    37.     }
    39.     @Override
    40.     public void Add(Company c) {
    41.         childern.add(c);
    42.     }
    44.     @Override
    45.     public void Remove(Company c) {
    46.         childern.remove(c);
    47.     }
    49.     @Override
    50.     public void Display(int depth) {
    51.         String string="";
    52.         for (int i = 0; i <depth; i++) {
    53.             string+="-";
    54.         }
    55.         System.out.println(string+this.name);
    57. //        遍历下级节点
    58.         for (Company company : childern) {
    59.             company.Display(depth+2);
    60.         }
    61.     }
    63. //    履行职责
    64.     @Override
    65.     public void LineOfDuty() {
    66.         for (Company company : childern) {
    67.             company.LineOfDuty();
    68.         }
    69.     }
    70. }
    71. // 财务部门
    72. public class FinanceDepartment extends Company {
    74.     public FinanceDepartment(String name) {
    75.         super(name);
    76.         // TODO Auto-generated constructor stub
    77.     }
    79.     @Override
    80.     public void Add(Company c) {
    81.         // TODO Auto-generated method stub
    83.     }
    85.     @Override
    86.     public void Remove(Company c) {
    87.         // TODO Auto-generated method stub
    89.     }
    91.     @Override
    92.     public void Display(int depth) {
    93.         String string="";
    94.         for (int i = 0; i <depth; i++) {
    95.             string+="-";
    96.         }
    97.         System.out.println(string+name);    
    98.     }
    100.     @Override
    101.     public void LineOfDuty() {
    102.         System.out.println(this.name+"公司财务收支管理");
    103.     }
    105. }
    106. // 人力部门
    107. public class HRDepartment extends Company {
    109.     public HRDepartment(String name) {
    110.         super(name);
    111.         // TODO Auto-generated constructor stub
    112.     }
    114.     @Override
    115.     public void Add(Company c) {
    116.         // TODO Auto-generated method stub
    118.     }
    120.     @Override
    121.     public void Remove(Company c) {
    122.         // TODO Auto-generated method stub
    124.     }
    126.     @Override
    127.     public void Display(int depth) {
    128.         String string="";
    129.         for (int i = 0; i <depth; i++) {
    130.             string+="-";
    131.         }
    132.         System.out.println(string+name);
    134.     }
    136.     @Override
    137.     public void LineOfDuty() {
    138.         System.out.println(this.name+"员工招聘培训管理");
    139.     }
    141. }
    142. public class Test {
    144.     public static void main(String[] args) {
    145.         ConcreteCompany root = new ConcreteCompany("北京总公司");
    146.         root.Add(new HRDepartment("总公司人力资源部"));
    147.         root.Add(new FinanceDepartment("总公司财务部"));
    149.         ConcreteCompany comp = new ConcreteCompany("上海华东分公司");
    150.         comp.Add(new HRDepartment("上海华东分公司人力资源部"));
    151.         comp.Add(new FinanceDepartment("上海华东分公司财务部"));
    153.         root.Add(comp);
    155.         ConcreteCompany comp1 = new ConcreteCompany("南京办事处");
    156.         comp1.Add(new HRDepartment("南京办事处人力资源部"));
    157.         comp1.Add(new FinanceDepartment("南京办事处财务部"));
    159.         comp.Add(comp1);
    161.         ConcreteCompany comp2 = new ConcreteCompany("杭州办事处");
    162.         comp2.Add(new HRDepartment("杭州办事处人力资源部"));
    163.         comp2.Add(new FinanceDepartment("杭州办事处财务部"));
    165.         comp.Add(comp2);
    167.         root.Display(1);
    169.         root.LineOfDuty();
    170.     }
    171. }