hhhhhhh/ShapeStatisticsAnalyzer.java

package jinjieti;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 图形统计分析器（进阶题功能）
 */
public class ShapeStatisticsAnalyzer {
    /**
     * 统计每种图形的数量
     */
    public Map<String, Integer> countShapeTypes(List<Shape> shapes) {
        Map<String, Integer> countMap = new HashMap<>();
        if (shapes == null) return countMap;
        
        for (Shape shape : shapes) {
            String type = shape.getClass().getSimpleName();
            countMap.put(type, countMap.getOrDefault(type, 0) + 1);
        }
        return countMap;
    }

    /**
     * 计算每种图形的面积占比
     */
    public Map<String, Double> calculateAreaRatio(List<Shape> shapes) {
        Map<String, Double> areaMap = new HashMap<>();
        double totalArea = 0.0;

        // 计算总面积和各类型面积
        if (shapes != null) {
            for (Shape shape : shapes) {
                String type = shape.getClass().getSimpleName();
                double area = shape.getArea();
                areaMap.put(type, areaMap.getOrDefault(type, 0.0) + area);
                totalArea += area;
            }
        }

        // 计算占比（避免除零）
        if (totalArea > 0) {
            for (Map.Entry<String, Double> entry : areaMap.entrySet()) {
                areaMap.put(entry.getKey(), entry.getValue() / totalArea);
            }
        }
        return areaMap;
    }
}