设计模式:组合模式(Composite Pattern)

  组合模式: 又叫部分整体模式, 它创建了对象组的树形结构,将对象组合成树状结构以表示"整体-部分"的层次关系。

  JDK中的HashMap就使用了组合模式

public abstract class OrganizationComponent {
	
	private String name; // 名字
	private String desc; // 说明
	
	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){
		// 默认实现
		throw new UnsupportedOperationException();
	}
	
	protected void remove(OrganizationComponent organizationComponent){
		// 默认实现
		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);
	}

	@Override
	protected void add(OrganizationComponent organizationComponent) {
		organizationComponents.add(organizationComponent);
	}

	@Override
	protected void remove(OrganizationComponent organizationComponent) {
		organizationComponents.remove(organizationComponent);
	}

	@Override
	public String getDesc() {
		return super.getDesc();
	}

	@Override
	protected 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department
	List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();
	
	public College(String name, String desc) {
		super(name, desc);
	}

	@Override
	protected void add(OrganizationComponent organizationComponent) {
		organizationComponents.add(organizationComponent);
	}

	@Override
	protected void remove(OrganizationComponent organizationComponent) {
		organizationComponents.remove(organizationComponent);
	}

	@Override
	public String getDesc() {
		return super.getDesc();
	}

	@Override
	protected 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);
	}
	
	@Override
	public String getDesc() {
		return super.getDesc();
	}

	@Override
	protected void print() {
		System.out.println("  ------"+getName()+"-------  ");
	}
}


public class Client {
	public static void main(String[] args){
		University university = new University("梁山大学", "成立于宋朝");
		College college1 = new College("兵部", "林冲部长");
		Department department1 = new Department("禁军系", "八十万士兵");
		Department department2 = new Department("后勤系", "厨师做的一手好菜");
		
		College college2 = new College("通信部", "戴宗部长");
		Department department3 = new Department("跑腿系", "十万士兵");
		
		university.add(college1);
		college1.add(department1);
		college1.add(department2);
		
		university.add(college2);
		college2.add(department3);
		
		university.print();
	}
}