diff --git a/w5/Circle.java b/w5/Circle.java
new file mode 100644
index 0000000..eeaf22d
--- /dev/null
+++ b/w5/Circle.java
@@ -0,0 +1,22 @@
+package com.rental.shape;
+
+public class Circle extends Shape {
+    private double radius;
+    
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+    
+    @Override
+    public void draw() {
+        System.out.println("绘制一个半径为" + radius + "的圆形");
+    }
+    
+    public double getRadius() {
+        return radius;
+    }
+    
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+}
\ No newline at end of file
diff --git a/w5/Rectangle.java b/w5/Rectangle.java
new file mode 100644
index 0000000..98a970e
--- /dev/null
+++ b/w5/Rectangle.java
@@ -0,0 +1,32 @@
+package com.rental.shape;
+
+public class Rectangle extends Shape {
+    private double width;
+    private double height;
+    
+    public Rectangle(double width, double height) {
+        this.width = width;
+        this.height = height;
+    }
+    
+    @Override
+    public void draw() {
+        System.out.println("绘制一个宽为" + width + "、高为" + height + "的矩形");
+    }
+    
+    public double getWidth() {
+        return width;
+    }
+    
+    public void setWidth(double width) {
+        this.width = width;
+    }
+    
+    public double getHeight() {
+        return height;
+    }
+    
+    public void setHeight(double height) {
+        this.height = height;
+    }
+}
\ No newline at end of file
diff --git a/w5/Shape.java b/w5/Shape.java
new file mode 100644
index 0000000..fb1f580
--- /dev/null
+++ b/w5/Shape.java
@@ -0,0 +1,5 @@
+package com.rental.shape;
+
+public abstract class Shape {
+    public abstract void draw();
+}
\ No newline at end of file
diff --git a/w5/ShapeTest.java b/w5/ShapeTest.java
new file mode 100644
index 0000000..ac89593
--- /dev/null
+++ b/w5/ShapeTest.java
@@ -0,0 +1,20 @@
+package com.rental.shape;
+
+public class ShapeTest {
+    public static void drawShape(Shape s) {
+        s.draw();
+    }
+    
+    public static void main(String[] args) {
+        System.out.println("基础题测试：");
+        System.out.println("----------------------------");
+        
+        Shape circle = new Circle(5.0);
+        Shape rectangle = new Rectangle(4.0, 6.0);
+        
+        drawShape(circle);
+        drawShape(rectangle);
+        
+        System.out.println("----------------------------");
+    }
+}
\ No newline at end of file
diff --git a/w5/USB.java b/w5/USB.java
new file mode 100644
index 0000000..f1ccf3e
--- /dev/null
+++ b/w5/USB.java
@@ -0,0 +1,6 @@
+package com.rental.usb;
+
+public interface USB {
+    void open();
+    void close();
+}
\ No newline at end of file