diff --git a/Question12-Encapsulation/.classpath b/Question12-Encapsulation/.classpath
new file mode 100644
index 0000000..c771657
--- /dev/null
+++ b/Question12-Encapsulation/.classpath
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
+	<classpathentry kind="src" path="src/main/java"/>
+	<classpathentry kind="output" path="build/classes"/>
+</classpath>
diff --git a/Question12-Encapsulation/.gitignore b/Question12-Encapsulation/.gitignore
new file mode 100644
index 0000000..84c048a
--- /dev/null
+++ b/Question12-Encapsulation/.gitignore
@@ -0,0 +1 @@
+/build/
diff --git a/Question12-Encapsulation/.project b/Question12-Encapsulation/.project
new file mode 100644
index 0000000..5aa0f8a
--- /dev/null
+++ b/Question12-Encapsulation/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question12-Encapsulation</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.wst.common.project.facet.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/Question12-Encapsulation/.settings/org.eclipse.jdt.core.prefs b/Question12-Encapsulation/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..23fa13b
--- /dev/null
+++ b/Question12-Encapsulation/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,9 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
+org.eclipse.jdt.core.compiler.compliance=21
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=21
diff --git a/Question12-Encapsulation/.settings/org.eclipse.wst.common.project.facet.core.xml b/Question12-Encapsulation/.settings/org.eclipse.wst.common.project.facet.core.xml
new file mode 100644
index 0000000..c1a8d07
--- /dev/null
+++ b/Question12-Encapsulation/.settings/org.eclipse.wst.common.project.facet.core.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<faceted-project>
+  <installed facet="java" version="21"/>
+</faceted-project>
diff --git a/Question12-Encapsulation/src/main/java/Item.java b/Question12-Encapsulation/src/main/java/Item.java
new file mode 100644
index 0000000..7fcb34c
--- /dev/null
+++ b/Question12-Encapsulation/src/main/java/Item.java
@@ -0,0 +1,14 @@
+
+public class Item {
+	
+	private String item;
+	
+	public Item() {
+		this.item = "アイテムA";
+	}
+	
+	public String getItem() {
+		return item;
+	}
+	
+}
diff --git a/Question12-Encapsulation/src/main/java/Question12_1.java b/Question12-Encapsulation/src/main/java/Question12_1.java
new file mode 100644
index 0000000..f084e64
--- /dev/null
+++ b/Question12-Encapsulation/src/main/java/Question12_1.java
@@ -0,0 +1,21 @@
+
+public class Question12_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		User user = new User();
+		
+		user.setId(1000);
+		user.setName("リゾーム太郎");
+		user.setMail("rhizome@hogehoge.com");
+		user.setPass("12345");
+		
+		System.out.println("ID　:"+user.getId());
+		System.out.println("名前　："+user.getName());
+		System.out.println("メールアドレス　："+user.getMail());
+		System.out.println("パスワード　："+user.getPass());
+		
+	}
+
+}
diff --git a/Question12-Encapsulation/src/main/java/Question12_2.java b/Question12-Encapsulation/src/main/java/Question12_2.java
new file mode 100644
index 0000000..cdf540b
--- /dev/null
+++ b/Question12-Encapsulation/src/main/java/Question12_2.java
@@ -0,0 +1,12 @@
+
+public class Question12_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		Item item = new Item();
+		System.out.println(item.getItem());
+		
+	}
+
+}
diff --git a/Question12-Encapsulation/src/main/java/User.java b/Question12-Encapsulation/src/main/java/User.java
new file mode 100644
index 0000000..b9122e7
--- /dev/null
+++ b/Question12-Encapsulation/src/main/java/User.java
@@ -0,0 +1,34 @@
+
+public class User {
+	
+	private int Id;
+	private String name;
+	private String mail;
+	private String pass;
+	
+	public int getId() {
+		return Id;
+	}
+	public void setId(int id) {
+		Id = id;
+	}
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public String getMail() {
+		return mail;
+	}
+	public void setMail(String mail) {
+		this.mail = mail;
+	}
+	public String getPass() {
+		return pass;
+	}
+	public void setPass(String pass) {
+		this.pass = pass;
+	}
+	
+}