? 組合模式: 又叫部分整體模式, 它創建了對象組的樹形結構,將對象組合成樹狀結構以表示"整體-部分"的層次關系。

? JDK中的HashMap就使用了組合模式

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public abstract class OrganizationComponent {private String name; // 名字private String desc; // 說明public String getName() {return name;}public void setName(String name) {this.name = name;}public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}public OrganizationComponent(String name,String desc){super();this.name = name;this.desc = desc;}protected void add(OrganizationComponent organizationComponent){// 默認實現throw new UnsupportedOperationException();}protected void remove(OrganizationComponent organizationComponent){// 默認實現throw new UnsupportedOperationException();}protected abstract void print(); }import java.util.ArrayList; import java.util.List;public class University extends OrganizationComponent{List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();public University(String name, String desc) {super(name, desc);}@Overrideprotected void add(OrganizationComponent organizationComponent) {organizationComponents.add(organizationComponent);}@Overrideprotected void remove(OrganizationComponent organizationComponent) {organizationComponents.remove(organizationComponent);}@Overridepublic String getDesc() {return super.getDesc();}@Overrideprotected void print() {System.out.println("--------"+getName()+"----------");for (OrganizationComponent organizationComponent : organizationComponents) {organizationComponent.print();System.out.println();}} }import java.util.ArrayList; import java.util.List;public class College extends OrganizationComponent{// 存放departmentList<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();public College(String name, String desc) {super(name, desc);}@Overrideprotected void add(OrganizationComponent organizationComponent) {organizationComponents.add(organizationComponent);}@Overrideprotected void remove(OrganizationComponent organizationComponent) {organizationComponents.remove(organizationComponent);}@Overridepublic String getDesc() {return super.getDesc();}@Overrideprotected void print() {System.out.println(" -------"+getName()+"--------- ");for (OrganizationComponent organizationComponent : organizationComponents) {organizationComponent.print();}} }public class Department extends OrganizationComponent{public Department(String name, String desc) {super(name, desc);}@Overridepublic String getDesc() {return super.getDesc();}@Overrideprotected void print() {System.out.println(" ------"+getName()+"------- ");} }public class Client {public static void main(String[] args){University university = new University("梁山大學", "成立于宋朝");College college1 = new College("兵部", "林沖部長");Department department1 = new Department("禁軍系", "八十萬士兵");Department department2 = new Department("后勤系", "廚師做的一手好菜");College college2 = new College("通信部", "戴宗部長");Department department3 = new Department("跑腿系", "十萬士兵");university.add(college1);college1.add(department1);college1.add(department2);university.add(college2);college2.add(department3);university.print();} }

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