组合模式

Folgerjun · web-flow · commit a3c44ae545e3 · 2018-03-12T10:35:12.000+08:00
组合模式
diff --git a/java-des/src/com/java/design/composite/Component.java b/java-des/src/com/java/design/composite/Component.java
@@ -0,0 +1,16 @@
+package com.java.design.composite;
+
+public abstract class Component {
+
+	protected String name;
+
+	public Component(String name) {
+		this.name = name;
+	}
+
+	public abstract void add(Component component);
+
+	public abstract void delete(Component component);
+
+	public abstract void show(int index);
+}
diff --git a/java-des/src/com/java/design/composite/Composite.java b/java-des/src/com/java/design/composite/Composite.java
@@ -0,0 +1,37 @@
+package com.java.design.composite;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Composite extends Component {
+
+	List<Component> components = new ArrayList<Component>();
+
+	public Composite(String name) {
+		super(name);
+	}
+
+	@Override
+	public void add(Component component) {
+
+		components.add(component);
+	}
+
+	@Override
+	public void show(int index) {
+
+		StringBuilder stringBuilder = new StringBuilder();
+		for (int i = 0; i < index; i++) {
+			stringBuilder.append("-");
+		}
+		System.out.println(stringBuilder.toString() + this.name);
+		for (Component component : components) {
+			component.show(index + 2);
+		}
+	}
+
+	@Override
+	public void delete(Component component) {
+		components.remove(component);
+	}
+}
diff --git a/java-des/src/com/java/design/composite/CompositePattern.java b/java-des/src/com/java/design/composite/CompositePattern.java
@@ -0,0 +1,31 @@
+package com.java.design.composite;
+
+/**
+ * 组合模式（Composite
+ * 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
+ * 。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。
+ * 
+ * @author Administrator
+ *
+ */
+public class CompositePattern {
+
+	public static void main(String[] args) {
+
+		Composite composite = new Composite("root");
+		composite.add(new Leaf("leaf1"));
+		composite.add(new Leaf("leaf2"));
+
+		Composite composite1 = new Composite("composite1");
+		composite1.add(new Leaf("leaf3"));
+		composite1.add(new Leaf("leaf4"));
+		composite1.add(new Leaf("leaf5"));
+		composite.add(composite1);
+
+		Leaf leaf6 = new Leaf("leaf6");
+		composite.add(leaf6);
+		// composite.delete(leaf6);
+		composite.show(1);
+	}
+
+}
diff --git a/java-des/src/com/java/design/composite/Leaf.java b/java-des/src/com/java/design/composite/Leaf.java
@@ -0,0 +1,30 @@
+package com.java.design.composite;
+
+public class Leaf extends Component {
+
+	public Leaf(String name) {
+		super(name);
+	}
+
+	@Override
+	public void add(Component component) {
+
+		System.out.println("A leaf could not add component");
+	}
+
+	@Override
+	public void delete(Component component) {
+
+		System.out.println("A leaf could not delete component");
+	}
+
+	@Override
+	public void show(int index) {
+
+		StringBuilder stringBuilder = new StringBuilder();
+		for (int i = 0; i < index; i++) {
+			stringBuilder.append("-");
+		}
+		System.out.println(stringBuilder.toString() + this.name);
+	}
+}
