diff --git a/QUIZ/Circle.java b/QUIZ/Circle.java
new file mode 100644
index 0000000..433e341
--- /dev/null
+++ b/QUIZ/Circle.java
@@ -0,0 +1,38 @@
+package QUIZ;
+
+public class Circle extends Shape {
+
+    protected  double radius;
+
+    public Circle() {
+        super();
+        radius = 1.0;
+    }
+    public Circle(double radius) {
+        super();
+        this.radius = radius;
+    }
+    public Circle(double radius, String color, boolean filled) {
+        super(color, filled);
+        this.radius = radius;
+    }
+    public double getRadius() {
+        return radius;
+    }
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+    @Override
+    public double getArea() {
+        return radius*radius*Math.PI;
+    }
+    @Override
+    public double getPerimeter() {
+        return 2 * radius * Math.PI;
+    }
+    @Override
+    public String toString() {
+        return String.format("Circle dengan radius = %f, merupakan subclas dari %s"
+                            , radius, super.toString());
+    }
+}
\ No newline at end of file
diff --git a/QUIZ/Rectangle.java b/QUIZ/Rectangle.java
new file mode 100644
index 0000000..f89a3ee
--- /dev/null
+++ b/QUIZ/Rectangle.java
@@ -0,0 +1,49 @@
+
+package QUIZ;
+
+public class Rectangle extends Shape{
+
+    protected  double width;
+    protected  double length;
+
+    public Rectangle() {
+        super();
+        width  = 1.0;
+        length = 1.0;
+    }
+    public Rectangle(double width, double length) {
+        super();
+        this.width  = width;
+        this.length = length;
+    }
+    public Rectangle(double width, double length, String color, boolean filled){
+        super(color, filled);
+        this.width  = width;
+        this.length = length;
+    }
+    public double getWidth() {
+        return width;
+    }
+    public void setWidth(double width) {
+        this.width = width;
+    }
+    public double getLength() {
+        return length;
+    }
+    public void setLength(double length) {
+        this.length = length;
+    }
+    @Override
+    public double getArea() {
+        return width * length;
+    }
+    @Override
+    public double getPerimeter() {
+        return 2 * (width+length);
+    }
+    @Override
+     public String toString() {
+        return String.format("Rectangle dengan lebar = %f dan panjang = %f, merupakan subclass dari %s"
+                            , width, length,super.toString());
+    }
+}
diff --git a/QUIZ/Shape.java b/QUIZ/Shape.java
new file mode 100644
index 0000000..05c6738
--- /dev/null
+++ b/QUIZ/Shape.java
@@ -0,0 +1,40 @@
+package QUIZ;
+
+public abstract class Shape {
+
+    protected String    color;
+    protected boolean   filled;
+
+    public Shape() {
+        color  = "red";
+        filled =true;
+    }
+
+    public Shape(String color, boolean filled) {
+        this.color  = color;
+        this.filled = filled;
+    }
+    
+    public String getColor() {
+        return color;
+    }
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public boolean isFilled(){
+        return filled;
+    }
+    public void setFilled(boolean filled) {
+        this.filled = filled;
+    }
+
+    abstract public double getArea();
+    abstract public double getPerimeter();
+
+    @Override
+    public String toString() {
+        return String.format("Shape dengan warna %s dan %s", 
+                color, (filled ? "terisi" : "tidak terisi"));
+    }
+}
\ No newline at end of file
diff --git a/QUIZ/Square.java b/QUIZ/Square.java
new file mode 100644
index 0000000..512edf4
--- /dev/null
+++ b/QUIZ/Square.java
@@ -0,0 +1,37 @@
+
+package QUIZ;
+
+public class Square extends Rectangle {
+
+    public Square() {
+        super();
+    }
+    public Square(double side) {
+        super(side, side);
+    }
+    public Square(double side, String color, boolean filled) {
+        super(side, side, color, filled);
+    }
+    public double getSide() {
+        return getWidth();
+    }
+    public void setSide(double side) {
+        setWidth(side);
+        setLength(side);
+    }
+    @Override
+    public void setWidth(double side) {
+        super.setWidth(side);
+        super.setLength(side);
+    }
+    @Override
+    public void setLength(double side) {
+        super.setWidth(side);
+        super.setLength(side);
+    }
+    @Override
+    public String toString() {
+        return String.format("Square dengan sisi = %f , merupakan subclass dari %s"
+                            , width, super.toString());
+    }
+}
diff --git a/QUIZ/Test.java b/QUIZ/Test.java
new file mode 100644
index 0000000..12cf96c
--- /dev/null
+++ b/QUIZ/Test.java
@@ -0,0 +1,59 @@
+
+package QUIZ;
+
+public class Test {
+    public static void main(String[] args) {
+        
+        Shape shape1 = new Circle(5.5, "RED", true);  // Upcast Circle ke Shape
+        System.out.println(shape1);                    
+        System.out.println(shape1.getArea());          
+        System.out.println(shape1.getPerimeter());     
+        System.out.println(shape1.getColor());
+        System.out.println(shape1.isFilled());
+        System.out.println("\n");
+           
+        Circle circle1 = (Circle)shape1;              // Downcast back ke Circle
+        System.out.println(circle1);
+        System.out.println(circle1.getArea());
+        System.out.println(circle1.getPerimeter());
+        System.out.println(circle1.getColor());
+        System.out.println(circle1.isFilled());
+        System.out.println(circle1.getRadius());
+        System.out.println("\n");
+           
+        Shape shape2 = new Rectangle(1.0, 2.0, "RED", true);   // Upcast
+        System.out.println(shape2);
+        System.out.println(shape2.getArea());
+        System.out.println(shape2.getPerimeter());
+        System.out.println(shape2.getColor());
+        System.out.println("\n");
+        
+        Rectangle rectangle1 = (Rectangle)shape2;     // downcast
+        System.out.println(rectangle1);
+        System.out.println(rectangle1.getArea());
+        System.out.println(rectangle1.getColor());
+        System.out.println(rectangle1.getLength());
+        System.out.println("\n");
+           
+        Shape shape3 = new Square(6.6);               // Upcast
+        System.out.println(shape3);
+        System.out.println(shape3.getArea());
+        System.out.println(shape3.getColor());
+        System.out.println("\n");
+
+        Rectangle rectangle2 = (Rectangle)shape3;     //downcast
+        System.out.println(rectangle2);
+        System.out.println(rectangle2.getArea());
+        System.out.println(rectangle2.getColor());
+        System.out.println(rectangle2.getLength());
+        System.out.println("\n");
+           
+        Square square1 = (Square)rectangle2;        //downcast rectangle2 ke square
+        System.out.println(square1);
+        System.out.println(square1.getArea());
+        System.out.println(square1.getColor());
+        System.out.println(square1.getSide());
+        System.out.println(square1.getLength());
+
+    }
+}
\ No newline at end of file