commit 5e9fa21b4dc4d2dc7385366aa55f1ded3db3ba26
Author: Guoyiting <654525901@qq.com>
Date:   Mon Mar 30 12:38:06 2026 +0800

    提交实验代码

diff --git a/ShapeAreaCalculator/Circle.java b/ShapeAreaCalculator/Circle.java
new file mode 100644
index 0000000..531c763
--- /dev/null
+++ b/ShapeAreaCalculator/Circle.java
@@ -0,0 +1,15 @@
+package ShapeAreaCalculator;
+
+public class Circle extends Shape {
+    private double radius;
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}
+
diff --git a/ShapeAreaCalculator/Main.java b/ShapeAreaCalculator/Main.java
new file mode 100644
index 0000000..6f8f78e
--- /dev/null
+++ b/ShapeAreaCalculator/Main.java
@@ -0,0 +1,13 @@
+package ShapeAreaCalculator;
+
+public class Main {
+    public static void main(String[] args) {
+        Shape circle = new Circle(5);
+        Shape rectangle = new Rectangle(4, 6);
+        Shape triangle = new Triangle(3, 4);
+
+        ShapeUtil.printArea(circle);
+        ShapeUtil.printArea(rectangle);
+        ShapeUtil.printArea(triangle);
+    }
+}
diff --git a/ShapeAreaCalculator/Rectangle.java b/ShapeAreaCalculator/Rectangle.java
new file mode 100644
index 0000000..96b3acc
--- /dev/null
+++ b/ShapeAreaCalculator/Rectangle.java
@@ -0,0 +1,16 @@
+package ShapeAreaCalculator;
+
+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 double getArea() {
+        return width * height;
+    }
+}
diff --git a/ShapeAreaCalculator/Shape.java b/ShapeAreaCalculator/Shape.java
new file mode 100644
index 0000000..d72d164
--- /dev/null
+++ b/ShapeAreaCalculator/Shape.java
@@ -0,0 +1,5 @@
+package ShapeAreaCalculator;
+
+public abstract class Shape {
+    public abstract double getArea();
+}
diff --git a/ShapeAreaCalculator/ShapeUtil.java b/ShapeAreaCalculator/ShapeUtil.java
new file mode 100644
index 0000000..e96f107
--- /dev/null
+++ b/ShapeAreaCalculator/ShapeUtil.java
@@ -0,0 +1,7 @@
+package ShapeAreaCalculator;
+
+public class ShapeUtil {
+    public static void printArea(Shape shape) {
+        System.out.println("图形面积: " + shape.getArea());
+    }
+}
diff --git a/ShapeAreaCalculator/Triangle.java b/ShapeAreaCalculator/Triangle.java
new file mode 100644
index 0000000..8b571ad
--- /dev/null
+++ b/ShapeAreaCalculator/Triangle.java
@@ -0,0 +1,16 @@
+package ShapeAreaCalculator;
+
+public class Triangle extends Shape {
+    private double base;
+    private double height;
+
+    public Triangle(double base, double height) {
+        this.base = base;
+        this.height = height;
+    }
+
+    @Override
+    public double getArea() {
+        return 0.5 * base * height;
+    }
+}
diff --git a/ShapeAreaCalculator/类图.puml b/ShapeAreaCalculator/类图.puml
new file mode 100644
index 0000000..1f74926
--- /dev/null
+++ b/ShapeAreaCalculator/类图.puml
@@ -0,0 +1,47 @@
+@startuml
+' 设置样式
+skinparam classAttributeIconSize 0
+skinparam backgroundColor #FEFEFE
+skinparam class {
+    BackgroundColor #E1F5FE
+    BorderColor #0288D1
+    ArrowColor #0288D1
+}
+
+abstract class Shape {
+    {abstract} + getArea(): double
+}
+
+class Circle {
+    - radius: double
+    + Circle(radius: double)
+    + getArea(): double
+}
+
+class Rectangle {
+    - width: double
+    - height: double
+    + Rectangle(width: double, height: double)
+    + getArea(): double
+}
+
+class Triangle {
+    - base: double
+    - height: double
+    + Triangle(base: double, height: double)
+    + getArea(): double
+}
+
+class ShapeUtil {
+    + {static} printArea(shape: Shape): void
+}
+
+' 继承关系
+Shape <|-- Circle
+Shape <|-- Rectangle
+Shape <|-- Triangle
+
+' 依赖关系
+ShapeUtil ..> Shape : uses
+
+@enduml
\ No newline at end of file