上传文件至 'w5'

w5/Circle.java

@@ -0,0 +1,8 @@
+package Shape;
+
+public class Circle extends Shape {
+    @Override
+    public void draw(){
+        System.out.println("画一个圆形");
+    }
+}

w5/Rectangle.java

@@ -0,0 +1,8 @@
+package Shape;
+
+public class Rectangle extends Shape {
+    @Override
+    public void draw(){
+        System.out.println("打印一个矩形");
+    }
+}

w5/Shape.java

@@ -0,0 +1,5 @@
+package Shape;
+
+public abstract class Shape {
+    public abstract void draw();
+}

w5/main.java

@@ -0,0 +1,14 @@
+package Shape;
+
+public class main {
+    public static void drawShape(Shape s){
+        s.draw();
+    }
+    public static void main(String[] args){
+        Shape circle = new Circle();
+        Shape rectabgle = new Rectangle();
+
+        drawShape(circle);
+        drawShape(rectabgle);
+    }
+}