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22 lines
682 B
22 lines
682 B
/**
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* 图形工具类：通过多态统一打印任意 {@link Shape} 的面积。
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*/
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public final class ShapeUtil {
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private ShapeUtil() {
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// 工具类禁止实例化
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}
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/**
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* 打印给定图形的面积（保留两位小数，便于实验输出阅读）。
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*
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* @param shape 任意 {@link Shape} 子类实例，可为 null（将给出提示）
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*/
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public static void printArea(Shape shape) {
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if (shape == null) {
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System.out.println("图形引用为空，无法计算面积。");
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return;
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}
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System.out.printf("该图形的面积为：%.2f%n", shape.getArea());
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}
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}
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