标签：style blog http io color os ar 使用 java
前言：【模式总览】——————————by xingoo
使对象组合成树形的结构。使用户对单个对象和组合对象的使用具有一致性。
1 表示对象的 部分-整体 层次结构
2 忽略组合对象与单个对象的不同，统一的使用组合结构中的所有对象。
【安全的组合模式】
这种组合模式，叶子节点，也就是单个对象不具有对象的控制功能。仅仅有简单的业务操作。
1 package com.xingoo.composite.safe; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 interface Component{ 7 Composite getCmposite(); 8 void sampleComposite(); 9 } 10 11 class Leaf implements Component{ 12 13 public Composite getCmposite() { 14 return null; 15 } 16 17 public void sampleComposite() { 18 System.out.println("Leaf operation"); 19 } 20 21 } 22 23 class Composite implements Component{ 24 25 private List<Component> list = new ArrayList(); 26 27 public void add(Component component){ 28 list.add(component); 29 } 30 31 public void remove(Component component){ 32 list.remove(component); 33 } 34 35 public Composite getCmposite() { 36 return this; 37 } 38 39 public void sampleComposite() { 40 System.out.println("Composite operation"); 41 for(Component com : list){ 42 com.sampleComposite(); 43 } 44 } 45 46 } 47 public class Client { 48 public static void main(String[] args) { 49 Component leaf1 = new Leaf(); 50 Component leaf2 = new Leaf(); 51 Component composite = new Composite(); 52 composite.getCmposite().add(leaf1); 53 composite.getCmposite().add(leaf2); 54 composite.getCmposite().sampleComposite(); 55 } 56 }
执行结果
Composite operation
Leaf operation
Leaf operation
【透明的组合模式】
这种组合模式，叶子节点与组合对象具有相同的方法，外表看来毫无差异。不过叶子节点的处理方法默认为空。忽略叶子节点，与组合对象的差异性。
1 package com.xingoo.composite.transparent; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 interface Component{ 7 public void SampleOperation(); 8 public void add(Component component); 9 public void remove(Component component); 10 public Component getComponent(); 11 } 12 13 class Leaf implements Component{ 14 public void SampleOperation() { 15 System.out.println("leaf operation!"); 16 } 17 18 public void add(Component component) { 19 20 } 21 22 public void remove(Component component) { 23 24 } 25 26 public Component getComponent(){ 27 return this; 28 } 29 } 30 31 class Composite implements Component{ 32 33 private List<Component> list = new ArrayList(); 34 35 public void SampleOperation() { 36 System.out.println("composite operation!"); 37 for(Component com : list){ 38 com.getComponent().SampleOperation(); 39 } 40 } 41 42 public void add(Component component) { 43 list.add(component); 44 } 45 46 public void remove(Component component) { 47 list.remove(component); 48 } 49 50 public Component getComponent(){ 51 return this; 52 } 53 } 54 public class Client { 55 public static void main(String[] args) { 56 Component leaf1 = new Leaf(); 57 Component leaf2 = new Leaf(); 58 Component leaf3 = new Leaf(); 59 Component composite1 = new Composite(); 60 Component composite = new Composite(); 61 62 composite1.add(leaf3); 63 64 composite.getComponent().add(leaf1); 65 composite.getComponent().add(leaf2); 66 composite.getComponent().add(composite1); 67 68 composite.getComponent().SampleOperation(); 69 } 70 }
本例中的结构层次
执行结果
composite operation! leaf operation! leaf operation! composite operation! leaf operation!
标签：style blog http io color os ar 使用 java
原文地址：http://www.cnblogs.com/xing901022/p/4060389.html
