完成图形面积计算器实验

ShapeAreaCalculator/Circle.java

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+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;
+    }
+}
+

ShapeAreaCalculator/Main.java

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+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);
+    }
+}

ShapeAreaCalculator/Rectangle.java

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+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;
+    }
+}

ShapeAreaCalculator/Shape.java

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+package ShapeAreaCalculator;
+
+public abstract class Shape {
+    public abstract double getArea();
+}

ShapeAreaCalculator/ShapeUtil.java

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+package ShapeAreaCalculator;
+
+public class ShapeUtil {
+    public static void printArea(Shape shape) {
+        System.out.println("图形面积: " + shape.getArea());
+    }
+}

ShapeAreaCalculator/Triangle.java

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+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;
+    }
+}

实验报告.md

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+一、实验目的
+1. 掌握抽象类的定义与使用
+2. 理解继承和多态的应用
+3. 学会统一处理不同图形对象
+
+## 二、类图
+![类图](c:\Users\65452\Desktop\ketang\out\ShapeAreaCalculator\类图\类图.png)
+
+三、AI使用记录
+代码结构设计
+
+类图生成
+
+报告撰写
+
+四、组合 vs 继承
+继承：子类继承父类，代码复用简单，但耦合度高
+
+组合：类包含其他类对象，灵活低耦合，但代码量多
+
+本实验：图形是"is-a"关系，适合用继承
+
+五、实验总结
+掌握了抽象类、继承和多态的应用，能够统一处理不同类型的图形对象。

类图.puml

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+@startuml
+abstract class Shape {
+    {abstract} + getArea(): double
+}
+
+class Circle {
+    - radius: double
+    + getArea(): double
+}
+
+class Rectangle {
+    - width: double
+    - height: double
+    + getArea(): double
+}
+
+class Triangle {
+    - base: double
+    - height: double
+    + getArea(): double
+}
+
+class ShapeUtil {
+    + printArea(Shape): void
+}
+
+Shape <|-- Circle
+Shape <|-- Rectangle
+Shape <|-- Triangle
+ShapeUtil ..> Shape
+@enduml