diff --git a/JavaOOP/src/Java10.java b/JavaOOP/src/Java10.java
new file mode 100644
index 00000000..3c548253
--- /dev/null
+++ b/JavaOOP/src/Java10.java
@@ -0,0 +1,23 @@
+import object.BookVO;
+
+public class Java10 {
+    public static void main(String[] args) {
+
+        /**
+         * 책 (BookVO) 이라는 자료형 만들기 -> class 를 통해 만든다.
+         * class 를 만들면 디폴트 생성자가 자동 생성된다. (생략)
+         * 생성자는 객체를 생성하는 작업을 한다. (기계어코드)
+         * 객체를 생성하면 이 객체를 가리키는 this 객체도 자동 생성된다.
+         */
+        BookVO b = new BookVO(); // 객체 생성
+        b.title = "자바";
+        b.price = 20000;
+        b.company = "출판사";
+        b.page = 670;
+
+        System.out.println(b.title);
+        System.out.println(b.price);
+        System.out.println(b.company);
+        System.out.println(b.page);
+    }
+}
diff --git a/JavaOOP/src/Java11.java b/JavaOOP/src/Java11.java
new file mode 100644
index 00000000..3be5f7b9
--- /dev/null
+++ b/JavaOOP/src/Java11.java
@@ -0,0 +1,14 @@
+import object.BookVO;
+
+public class Java11 {
+
+    public static void main(String[] args) {
+        // 생성자 -> 생성 + 초기화 -> 중복정의
+        BookVO b = new BookVO("자바",20000,"길벗",790);
+
+        System.out.println(b.title);
+        System.out.println(b.price);
+        System.out.println(b.company);
+        System.out.println(b.page);
+    }
+}
diff --git a/JavaOOP/src/Java12.java b/JavaOOP/src/Java12.java
new file mode 100644
index 00000000..1460d9a9
--- /dev/null
+++ b/JavaOOP/src/Java12.java
@@ -0,0 +1,16 @@
+import object.PrivateConstructor;
+
+public class Java12 {
+
+    public static void main(String[] args) {
+
+//        // 생성자가 private 이므로 객체 생성 불가
+//        PrivateConstructor pc = new PrivateConstructor();
+//
+//        // non-static-method 사용 불가
+//        PrivateConstructor.nonStaticMethod();
+
+        // static-method 만 사용가능
+        PrivateConstructor.staticMethod();
+    }
+}
diff --git a/JavaOOP/src/object/BookVO.java b/JavaOOP/src/object/BookVO.java
new file mode 100644
index 00000000..b5d9ecb7
--- /dev/null
+++ b/JavaOOP/src/object/BookVO.java
@@ -0,0 +1,18 @@
+package object;
+
+public class BookVO {
+    public String title;
+    public int price;
+    public String company;
+    public int page;
+
+    public BookVO() {
+    }
+
+    public BookVO(String title, int price, String company, int page) {
+        this.title = title;
+        this.price = price;
+        this.company = company;
+        this.page = page;
+    }
+}
diff --git a/JavaOOP/src/object/PrivateConstructor.java b/JavaOOP/src/object/PrivateConstructor.java
new file mode 100644
index 00000000..9e8a3e95
--- /dev/null
+++ b/JavaOOP/src/object/PrivateConstructor.java
@@ -0,0 +1,15 @@
+package object;
+
+public class PrivateConstructor {
+
+    private PrivateConstructor() {
+    }
+
+    public void nonStaticMethod() {
+        System.out.println("non-static-method");
+    }
+
+    public static void staticMethod() {
+        System.out.println("static method");
+    }
+}