添加不用多态的shape初版第一版

ShapeCalculator.java

@@ -0,0 +1,68 @@
+package com.example;
+
+/**
+ * 图形面积计算器第一版（不使用多态）
+ */
+public class ShapeCalculator {
+    
+    // 计算圆形面积
+    public double calculateCircleArea(double radius) {
+        return Math.PI * radius * radius;
+    }
+    
+    // 计算矩形面积
+    public double calculateRectangleArea(double width, double height) {
+        return width * height;
+    }
+    
+    // 计算三角形面积
+    public double calculateTriangleArea(double base, double height) {
+        return base * height / 2;
+    }
+    
+    // 绘制圆形
+    public void drawCircle(double radius) {
+        System.out.println("绘制一个半径为 " + radius + " 的圆形");
+    }
+    
+    // 绘制矩形
+    public void drawRectangle(double width, double height) {
+        System.out.println("绘制一个宽为 " + width + "，高为 " + height + " 的矩形");
+    }
+    
+    // 绘制三角形
+    public void drawTriangle(double base, double height) {
+        System.out.println("绘制一个底为 " + base + "，高为 " + height + " 的三角形");
+    }
+    
+    public static void main(String[] args) {
+        ShapeCalculator calculator = new ShapeCalculator();
+        
+        // 测试圆形
+        double circleRadius = 5.0;
+        double circleArea = calculator.calculateCircleArea(circleRadius);
+        System.out.println("圆形的半径: " + circleRadius);
+        System.out.println("圆形的面积: " + circleArea);
+        calculator.drawCircle(circleRadius);
+        
+        System.out.println();
+        
+        // 测试矩形
+        double rectWidth = 4.0;
+        double rectHeight = 6.0;
+        double rectArea = calculator.calculateRectangleArea(rectWidth, rectHeight);
+        System.out.println("矩形的宽: " + rectWidth + "，高: " + rectHeight);
+        System.out.println("矩形的面积: " + rectArea);
+        calculator.drawRectangle(rectWidth, rectHeight);
+        
+        System.out.println();
+        
+        // 测试三角形
+        double triangleBase = 8.0;
+        double triangleHeight = 3.0;
+        double triangleArea = calculator.calculateTriangleArea(triangleBase, triangleHeight);
+        System.out.println("三角形的底: " + triangleBase + "，高: " + triangleHeight);
+        System.out.println("三角形的面积: " + triangleArea);
+        calculator.drawTriangle(triangleBase, triangleHeight);
+    }
+}