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27 lines
588 B
27 lines
588 B
package com.shape;
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public class Circle extends Shape {
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private double radius; // 半径
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public Circle(double radius) {
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if (radius <= 0) {
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throw new IllegalArgumentException("半径必须大于0");
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}
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this.radius = radius;
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}
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public double getRadius() {
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return radius;
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}
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public void setRadius(double radius) {
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if (radius > 0) {
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this.radius = radius;
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}
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}
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@Override
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public double getArea() {
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return Math.PI * radius * radius; // πr²
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}
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}
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