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17 lines
372 B
17 lines
372 B
/**
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* 图形抽象基类：统一多态入口，具体面积由子类实现。
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*/
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public abstract class Shape {
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/**
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* @return 图形面积（具体单位由子类语义决定，如平方厘米）
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*/
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public abstract double getArea();
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/**
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* 绘制图形
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*/
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public void draw() {
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System.out.println("绘制图形");
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}
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}
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