#composite pattern

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[소프트웨어 설계 패턴 C#] 19. 복합체 패턴(Composite Pattern) 구현 실습

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Design Patterns Part 2

Design Patterns Part 2

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DP/09/24/SP: Composite pattern

Programmers often develop systems in which a component may be an individual object or may represent a collection of objects. The Composite pattern is designed to accommodate both cases. You can use it to build part-whole hierarchies or to construct data representations of trees.

Composite is a collection of objects

It describes that a group of objects are to be treated in the same way as a single instance of an object

The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies

Example code:

package com.designpattern.structuralpattern; import java.util.List; import java.util.ArrayList; // component interface Graphic{     public void print(); } // composite class CompositeGraphic implements Graphic{     private List<Graphic> childGraphics = new ArrayList<Graphic>();         @Override     public void print() {         for(Graphic graphic : childGraphics){             graphic.print();         }     }         public void add(Graphic graphic){         childGraphics.add(graphic);     }         public void remove(Graphic graphic){         childGraphics.remove(graphic);     }     } // leaf class Ellipse implements Graphic{     @Override     public void print() {         System.out.println("Ellipse");     }     } // client public class CompositePattern {     public static void main(String[] args){         Ellipse ellipse1 = new Ellipse();         Ellipse ellipse2 = new Ellipse();         Ellipse ellipse3 = new Ellipse();         Ellipse ellipse4 = new Ellipse();                 //composite         CompositeGraphic graphic = new CompositeGraphic();         CompositeGraphic graphic1 = new CompositeGraphic();         CompositeGraphic graphic2 = new CompositeGraphic();                 graphic1.add(ellipse1);         graphic1.add(ellipse2);         graphic1.add(ellipse3);                 graphic2.add(ellipse4);                 graphic.add(ellipse1);         graphic.add(ellipse2);                 graphic.print();     } }