8000 组合模式 · Folgerjun/DesignPatterns-Java@a3c44ae · GitHub
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组合模式
组合模式
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‎java-des/src/com/java/design/composite/Component.java

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package com.java.design.composite;
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public abstract class Component {
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protected String name;
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public Component(String name) {
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this.name = name;
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}
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public abstract void add(Component component);
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public abstract void delete(Component component);
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public abstract void show(int index);
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}

‎java-des/src/com/java/design/composite/Composite.java

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package com.java.design.composite;
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import java.util.ArrayList;
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import java.util.List;
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public class Composite extends Component {
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List<Component> components = new ArrayList<Component>();
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public Composite(String name) {
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super(name);
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}
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@Override
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public void add(Component component) {
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components.add(component);
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}
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@Override
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public void show(int index) {
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StringBuilder stringBuilder = new StringBuilder();
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for (int i = 0; i < index; i++) {
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stringBuilder.append("-");
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}
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System.out.println(stringBuilder.toString() + this.name);
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for (Component component : components) {
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component.show(index + 2);
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}
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}
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@Override
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public void delete(Component component) {
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components.remove(component);
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}
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}

‎java-des/src/com/java/design/composite/CompositePattern.java

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package com.java.design.composite;
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/**
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* 组合模式（Composite
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* Pattern），又叫部分整体模式，是用于把一组相似的对象当作一个单一的对象。组合模式依据树形结构来组合对象，用来表示部分以及整体层次
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* 。这种类型的设计模式属于结构型模式，它创建了对象组的树形结构。
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*
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* @author Administrator
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*
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*/
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public class CompositePattern {
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public static void main(String[] args) {
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Composite composite = new Composite("root");
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composite.add(new Leaf("leaf1"));
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composite.add(new Leaf("leaf2"));
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Composite composite1 = new Composite("composite1");
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composite1.add(new Leaf("leaf3"));
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composite1.add(new Leaf("leaf4"));
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composite1.add(new Leaf("leaf5"));
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composite.add(composite1);
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Leaf leaf6 = new Leaf("leaf6");
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composite.add(leaf6);
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// composite.delete(leaf6);
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composite.show(1);
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}
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}

‎java-des/src/com/java/design/composite/Leaf.java

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package com.java.design.composite;
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public class Leaf extends Component {
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public Leaf(String name) {
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super(name);
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}
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@Override
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public void add(Component component) {
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System.out.println("A leaf could not add component");
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}
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@Override
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public void delete(Component component) {
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System.out.println("A leaf could not delete component");
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}
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@Override
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public void show(int index) {
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StringBuilder stringBuilder = new StringBuilder();
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for (int i = 0; i < index; i++) {
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stringBuilder.append("-");
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}
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System.out.println(stringBuilder.toString() + this.name);
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}
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}

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