享元模式

Folgerjun · web-flow · commit b6112b1c8121 · 2018-03-12T10:42:11.000+08:00
享元模式
diff --git a/java-des/src/com/java/design/flyweight/FlyWeight.java b/java-des/src/com/java/design/flyweight/FlyWeight.java
@@ -0,0 +1,7 @@
+package com.java.design.flyweight;
+
+public interface FlyWeight {
+
+	void showIndex(Integer index);
+
+}
diff --git a/java-des/src/com/java/design/flyweight/FlyWeightFactory.java b/java-des/src/com/java/design/flyweight/FlyWeightFactory.java
@@ -0,0 +1,28 @@
+package com.java.design.flyweight;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class FlyWeightFactory {
+
+	private static Map<Integer, FlyWeight> map = new HashMap<Integer, FlyWeight>();
+
+	public FlyWeightFactory(Integer index) {
+
+		map.put(index, new FlyWeightImpl());
+	}
+
+	public static FlyWeight getFlyWeight(Integer index) {
+		if (!map.containsKey(index)) {
+
+			map.put(index, new FlyWeightImpl());
+		}
+
+		return map.get(index);
+	}
+
+	public static Integer getSize() {
+		return map.size();
+	}
+
+}
diff --git a/java-des/src/com/java/design/flyweight/FlyWeightImpl.java b/java-des/src/com/java/design/flyweight/FlyWeightImpl.java
@@ -0,0 +1,10 @@
+package com.java.design.flyweight;
+
+public class FlyWeightImpl implements FlyWeight {
+
+	@Override
+	public void showIndex(Integer index) {
+
+		System.out.println("Index : " + index);
+	}
+}
diff --git a/java-des/src/com/java/design/flyweight/FlyweightPattern.java b/java-des/src/com/java/design/flyweight/FlyweightPattern.java
@@ -0,0 +1,32 @@
+package com.java.design.flyweight;
+
+/**
+ * 享元模式(Flyweight Pattern) --↓↓↓---
+ * 运用共享技术有效地支持大量细粒度对象的复用。系统只使用少量的对象，而这些对象都很相似，状态变化很小
+ * ，可以实现对象的多次复用。由于享元模式要求能够共享的对象必须是细粒度对象，因此它又称为轻量级模式，它是一种对象结构型模式。
+ * 
+ * @author Administrator
+ *
+ */
+public class FlyweightPattern {
+
+	public static void main(String[] args) {
+
+		FlyWeight flyWeight = FlyWeightFactory.getFlyWeight(1);
+		FlyWeight flyWeight2 = FlyWeightFactory.getFlyWeight(1);
+		System.out.println("is the same ?  ---> : " + (flyWeight == flyWeight2));
+
+		FlyWeight flyWeight3 = FlyWeightFactory.getFlyWeight(3);
+		flyWeight3.showIndex(3);
+
+		FlyWeight flyWeight4 = FlyWeightFactory.getFlyWeight(4);
+		flyWeight4.showIndex(4);
+
+		FlyWeight flyWeight5 = FlyWeightFactory.getFlyWeight(5);
+		flyWeight5.showIndex(5);
+
+		System.out.println("map size is : " + FlyWeightFactory.getSize());
+
+	}
+
+}
