Memento Pattern

design-pattern/src/Memento/Application.java

@@ -0,0 +1,32 @@
+package Memento;
+
+import Memento.abc.Memento;
+import Memento.abc.Originator;
+
+import java.util.Stack;
+
+public class Application {
+    public static void main(String[] args) {
+
+        Stack<Memento> mementos = new Stack<>();
+
+        Originator originator = new Originator();
+        originator.setState("state 1");
+        mementos.push(originator.createMemento());
+        originator.setState("state 2");
+        mementos.push(originator.createMemento());
+        originator.setState("state 3");
+        mementos.push(originator.createMemento());
+        originator.setState("state Final");
+        mementos.push(originator.createMemento());
+
+        originator.restoreMemento(mementos.pop());
+        System.out.println(originator.getState());
+        originator.restoreMemento(mementos.pop());
+        System.out.println(originator.getState());
+        originator.restoreMemento(mementos.pop());
+        System.out.println(originator.getState());
+        originator.restoreMemento(mementos.pop());
+        System.out.println(originator.getState());
+    }
+}

design-pattern/src/Memento/Memento

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+Memento Pattern
+ - 상태 저장하기
+ - 메멘토 패턴을 통해 객체의 상태를 저장하고 이전상태로 복구
+
+

design-pattern/src/Memento/abc/Memento.java

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+package Memento.abc;
+
+public class Memento {
+
+    String state;
+
+    protected Memento(String state) {
+        this.state = state;
+    }
+
+    protected String getState() {
+        return this.state;
+    }
+}

design-pattern/src/Memento/abc/Originator.java

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+package Memento.abc;
+
+public class Originator {
+
+    String state;
+
+    public Memento createMemento() {
+        return new Memento(state);
+    }
+
+    public void restoreMemento(Memento memento) {
+        this.state = memento.getState();
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+}