【结构型模式】《大话设计模式》——读后感 （14）分公司=一部门？——组合模式

 

组合模式：将对象组合成树形结构以表示“部分整体”的层次结构。组合模式使得用户对单个对象和组合对象的使用具有一致性【DP】

 

 Company：

package com.sjmx.composite;public abstract class Company {    private String name;    public Company(String name) {        this.name = name;    }    public Company() {    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    protected abstract void add(Company company);    protected abstract void romove(Company company);    protected abstract void display(int depth);}

 

叶子节点：

package com.sjmx.composite;public class LeafCompany extends Company {    public LeafCompany() {    }    public LeafCompany(String name) {        super(name);    }    @Override    protected void add(Company company) {    }    @Override    protected void romove(Company company) {    }    @Override    protected void display(int depth) {        StringBuilder sb = new StringBuilder("");        for (int i = 0; i < depth; i++) {            sb.append("-");        }        System.out.println(new String(sb) + this.getName());    }}

 

直属节点：

package com.sjmx.composite;public class HRDepartment extends Company {              public HRDepartment(){}            public HRDepartment(String name){          super(name);      }            @Override      protected void add(Company company) {        }        @Override      protected void display(int depth) {          StringBuilder sb = new StringBuilder("");          for (int i = 0; i < depth; i++) {              sb.append("-");           }          System.out.println(new String(sb) + this.getName() ) ;       }        @Override      protected void romove(Company company) {}        }  

 

树干节点：

package com.sjmx.composite;import java.util.ArrayList;import java.util.List;public class ConcreteCompany extends Company {      private List<Company> cList;        public ConcreteCompany() {          cList = new ArrayList<Company>();      }        public ConcreteCompany(String name) {          super(name);           cList = new ArrayList<Company>() ;       }        @Override      protected void add(Company company) {          cList.add(company);      }        @Override      protected void display(int depth) {          StringBuilder sb = new StringBuilder("");          for (int i = 0; i < depth; i++) {              sb.append("-");           }          System.out.println(new String(sb) + this.getName());          for (Company c : cList) {              c.display(depth + 4);          }      }        @Override      protected void romove(Company company) {          cList.remove(company);      }  }  

客户端：

package com.sjmx.composite;public class Client {    /**      * @param args      */      public static void main(String[] args) {          Company root = new ConcreteCompany();          root.setName("北京总公司");          root.add(new HRDepartment("总公司人力资源部"));          root.add(new ConcreteCompany("总公司财务部"));                  Company shandongCom = new ConcreteCompany("山东分公司");          shandongCom.add(new HRDepartment("山东分公司人力资源部"));          shandongCom.add(new ConcreteCompany("山东分公司账务部"));                  Company zaozhuangCom = new ConcreteCompany("枣庄办事处");          zaozhuangCom.add(new ConcreteCompany("枣庄办事处财务部"));          zaozhuangCom.add(new HRDepartment("枣庄办事处人力资源部"));                  Company jinanCom = new ConcreteCompany("济南办事处");          jinanCom.add(new ConcreteCompany("济南办事处财务部"));          jinanCom.add(new HRDepartment("济南办事处人力资源部"));                   shandongCom.add(jinanCom);          shandongCom.add(zaozhuangCom);                          Company huadongCom = new ConcreteCompany("上海华东分公司");          huadongCom.add(new HRDepartment("上海华东分公司人力资源部"));          huadongCom.add(new ConcreteCompany("上海华东分公司账务部"));                 Company hangzhouCom = new ConcreteCompany("杭州办事处");          hangzhouCom.add(new ConcreteCompany("杭州办事处财务部"));          hangzhouCom.add(new HRDepartment("杭州办事处人力资源部"));                Company nanjingCom = new ConcreteCompany("南京办事处");          nanjingCom.add(new ConcreteCompany("南京办事处财务部"));          nanjingCom.add(new HRDepartment("南京办事处人力资源部"));                 huadongCom.add(hangzhouCom);          huadongCom.add(nanjingCom);                 root.add(shandongCom);          root.add(huadongCom);                          root.display(0);      }  }

 

运行结果：

北京总公司----总公司人力资源部----总公司财务部----山东分公司--------山东分公司人力资源部--------山东分公司账务部--------济南办事处------------济南办事处财务部------------济南办事处人力资源部--------枣庄办事处------------枣庄办事处财务部------------枣庄办事处人力资源部----上海华东分公司--------上海华东分公司人力资源部--------上海华东分公司账务部--------杭州办事处------------杭州办事处财务部------------杭州办事处人力资源部--------南京办事处------------南京办事处财务部------------南京办事处人力资源部