Flyweight Pattern

design-pattern/src/Flyweight/Application.java

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+package Flyweight;
+
+public class Application {
+    public static void main(String[] args) {
+
+        FlyweightFactory factory = new FlyweightFactory();
+
+        Flyweight flyweight = factory.getFlyweight("A");
+        System.out.println(flyweight);
+        flyweight = factory.getFlyweight("A");
+        System.out.println(flyweight);
+        flyweight = factory.getFlyweight("A");
+        System.out.println(flyweight);
+        flyweight = factory.getFlyweight("B");
+        System.out.println(flyweight);
+        flyweight = factory.getFlyweight("B");
+        System.out.println(flyweight);
+    }
+}

design-pattern/src/Flyweight/Flyweight

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+Flyweight Pattern
+ - 메모리 절약하기

design-pattern/src/Flyweight/Flyweight.java

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+package Flyweight;
+
+public class Flyweight {
+
+    private String data;
+
+    public Flyweight(String data) {
+        this.data = data;
+    }
+
+    public String getData() {
+        return data;
+    }
+}

design-pattern/src/Flyweight/FlyweightFactory.java

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+package Flyweight;
+
+import java.util.Map;
+import java.util.TreeMap;
+
+public class FlyweightFactory {
+
+    Map<String, Flyweight> pool;
+
+    public FlyweightFactory() {
+        pool = new TreeMap<>();
+    }
+
+    public Flyweight getFlyweight(String key) {
+        Flyweight flyweight = pool.get(key);
+
+        if(flyweight == null) {
+            flyweight = new Flyweight(key);
+            pool.put(key, flyweight);
+            System.out.println("새로생성 : " + key);
+        } else {
+            System.out.println("재사용 : " + key);
+        }
+        return flyweight;
+    }
+}