State Pattern

design-pattern/src/State/Application.java

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+package State;
+
+public class Application {
+    public static void main(String[] args) {
+        Light light = new Light();
+
+        light.off();
+        light.off();
+        light.off();
+
+        light.on();
+        light.on();
+        light.on();
+
+        light.off();
+        light.on();
+        light.off();
+        light.on();
+        light.off();
+        light.on();
+    }
+}

design-pattern/src/State/Light.java

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+package State;
+
+public class Light {
+
+    protected LightState lightState;
+
+    private LightState offState = new LightState() {
+        @Override
+        public void on() {
+            System.out.println("Light ON");
+            lightState = onState;
+        }
+
+        @Override
+        public void off() {
+            System.out.println("Nothing");
+        }
+    };
+
+    private LightState onState = new LightState() {
+        @Override
+        public void on() {
+            System.out.println("Nothing");
+        }
+
+        @Override
+        public void off() {
+            System.out.println("Light OFF");
+            lightState = offState;
+        }
+    };
+
+    public Light() {
+        lightState = offState;
+    }
+
+    public void on() {
+        lightState.on();
+    }
+    public void off() {
+        lightState.off();
+    }
+}
+
+interface LightState {
+    void on();
+    void off();
+}

design-pattern/src/State/State

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+State pattern
+ - 상태를 객체로 나타내기