组合模式实例商品类别树

1.题目：
有一个根节点，比如“服装”，它没有父节点，它可以包含其他的节点。
树枝节点，有一类节点可以包含其他的节点，称之为树枝节点，比如“男装”、“女装”和“母婴”。
叶子节点，有一类节点没有子节点，称之为叶子节点，比如“衬衣”、“夹克”、“裙子”、“套装”等。
如果碰到类似上面这种，需使用对象树来描述或实现的功能，都可以考虑使用组合模式，比如读取XML文件，或是对语句进行语法解析等。
2.UML图

3.代码

package 组合模式;

public abstract class Cloth {

protected String name;
public Cloth(String name)
{this.name=name;
}
public abstract void Add(Cloth c);
public abstract void Remove(Cloth c);
public abstract void display(String str);
}

package 组合模式;

import java.util.ArrayList;
public class ConcreteCloth extends Cloth {

    private ArrayList<Cloth>children=new ArrayList<Cloth>();
    public ConcreteCloth(String name)
    {
        super(name);
    }
    @Override
    public void Add(Cloth c) {
        children.add(c);
    }
 
    @Override
    public void Remove(Cloth c) {
        children.remove(c);
    }
 
    @Override
    public void display(String str) {
        str+="-";
        System.out.println(str+name);
        for(Cloth component:children)
        {component.display(str);
        }
    }
}

package 组合模式;

public class Custome extends Cloth {
    public Custome(String name) {
        super(name);
    }
 
    @Override
    public void Add(Cloth c) { 
    }
 
    @Override
    public void Remove(Cloth c) {
    }
 
    @Override
    public void display(String str) {
    str+="-";
    System.out.println(str+name);
 
    }

}

package 组合模式;

public class Jacket extends Cloth {

    public Jacket(String name) {
        super(name);
    }

    @Override
    public void Add(Cloth c) {
    }

    @Override
    public void Remove(Cloth c) {
    }

    @Override
    public void display(String str) {
        str+="-";
        System.out.println(str+name);

    }

}

package 组合模式;

public class Shirt extends Cloth {

    public Shirt(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void Add(Cloth c) {
        // TODO Auto-generated method stub

    }

    @Override
    public void Remove(Cloth c) {
        // TODO Auto-generated method stub

    }

    @Override
    public void display(String str) {
        str+="-";
        System.out.println(str+name);
    }

}

package 组合模式;

public class Skirt extends Cloth {

    public Skirt(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void Add(Cloth c) {
        // TODO Auto-generated method stub

    }

    @Override
    public void Remove(Cloth c) {
        // TODO Auto-generated method stub

    }

    @Override
    public void display(String str) {
        str+="-";
        System.out.println(str+name);
    }

}

package 组合模式;

public class Test {

    public static void main(String[] args) {
        ConcreteCloth root=new ConcreteCloth("服装");
        ConcreteCloth comp1=new ConcreteCloth("男装");
        ConcreteCloth comp2=new ConcreteCloth("女装");
        comp1.Add(new  Shirt("衬衫"));
        comp1.Add(new Jacket("夹克"));
        comp2.Add(new Skirt("裙子"));
        comp2.Add(new Custome("礼服"));
            root.Add(comp1);
            root.Add(comp2);
            root.display("");
    }

}