Initial commit

Experiment/graph/Exp4/Graphic.mermaid

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+classDiagram
+    class Graphic {
+        <<interface>>
+        + double area()
+        + double perimeter()
+    }
+
+    class Circle {
+        - double radius
+        + Circle(double radius)
+        + double area()
+        + double perimeter()
+        + double getRadius()
+    }
+
+    class Rectangle {
+        - double width
+        - double height
+        + Rectangle(double width, double height)
+        + double area()
+        + double perimeter()
+        + double getWidth()
+        + double getHeight()
+    }
+
+    class Test {
+        + main(String[] args)
+    }
+
+    Graphic <|.. Circle : 实现
+    Graphic <|.. Rectangle : 实现
+    Test --> Circle : 创建与使用
+    Test --> Rectangle : 创建与使用