浅谈JAVA设计模式之——组合模式（Composite）

package com.lyz.design.composite;
import java.util.List;
/**
 * 定义Component 类Employer
 * @author binghe
 *
 */
public abstract class Employer {
    private String name;
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return this.name;
    }
    public abstract void add(Employer employer);
    public abstract void delete(Employer employer);
    public List<Employer> employers;
    public void printInfo() {
        System.out.println(name);
    }
    public List<Employer> getEmployers() {
        return this.employers;
    }
}

package com.lyz.design.composite;
/**
 * 定义Leaf类Programmer
 * @author binghe
 *
 */
public class Programmer extends Employer {
    public Programmer(String name) {
        setName(name);
        employers = null;//程序员, 表示没有下属了
    }
    public void add(Employer employer) {
    }
    public void delete(Employer employer) {
    }
}

package com.lyz.design.composite;
/**
 * 定义Leaf类ProjectAssistant
 * @author binghe
 *
 */
public class ProjectAssistant extends Employer {
    public ProjectAssistant(String name) {
        setName(name);
        employers = null;//项目助理, 表示没有下属了
    }
    public void add(Employer employer) {
    }
    public void delete(Employer employer) {
    }
}

package com.lyz.design.composite;
import java.util.ArrayList;
/**
 * 定义Composite类ProjectManager类
 * @author binghe
 *
 */
public class ProjectManager extends Employer {
    public ProjectManager(String name) {
        setName(name);
        employers = new ArrayList<Employer>();
    }
    public void add(Employer employer) {
        employers.add(employer);
    }
    public void delete(Employer employer) {
        employers.remove(employer);
    }
}

package com.lyz.design.composite;
import java.util.List;
/**
 * 测试类
 * @author binghe
 *
 */
public class Test {
    public static void main(String[] args) {
        Employer pm = new ProjectManager("项目经理");
        Employer pa = new ProjectAssistant("项目助理");
        Employer programmer1 = new Programmer("程序员一");
        Employer programmer2 = new Programmer("程序员二");
        pm.add(pa);//为项目经理添加项目助理
        pm.add(programmer2);//为项目经理添加程序员
        List<Employer> ems = pm.getEmployers();
        for (Employer em : ems) {
            System.out.println(em.getName());
        }
    }
}