hhhhhhh/CompositeShape.java

package tiaozhanti;

import java.util.ArrayList;
import java.util.List;

/**
 * 复合图形（可包含多个子图形）
 */
public class CompositeShape implements Shape {
    private String color;  // 复合图形整体颜色
    private List<Shape> children = new ArrayList<>();  // 子图形列表

    public CompositeShape(String color) {
        this.color = color;
    }

    // 添加子图形
    public void addShape(Shape shape) {
        if (shape != null) children.add(shape);
    }

    // 移除子图形
    public void removeShape(Shape shape) {
        children.remove(shape);
    }

    @Override
    public String getColor() {
        return color;
    }

    @Override
    public double getArea() {
        // 总面积=所有子图形面积之和
        return children.stream().mapToDouble(Shape::getArea).sum();
    }

    // 获取子图形列表（测试用）
    public List<Shape> getChildren() {
        return new ArrayList<>(children);
    }
}