java/ShapeCalculator.java

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);
    }
}