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// 抽象图形类
abstract class Shape {
public abstract double getArea();
}
// 圆形
class Circle extends Shape {
private double r;
public Circle(double r) {
this.r = r;
}
@Override
public double getArea() {
return Math.PI * r * r;
}
}
// 矩形
class Rectangle extends Shape {
private double width;
private double height;
public Rectangle(double width, double height) {
this.width = width;
this.height = height;
}
@Override
public double getArea() {
return width * height;
}
}
// 三角形
class Triangle extends Shape {
private double base;
private double height;
public Triangle(double base, double height) {
this.base = base;
this.height = height;
}
@Override
public double getArea() {
return 0.5 * base * height;
}
}
// 工具类
class ShapeUtil {
public static void printArea(Shape shape) {
System.out.println("面积：" + shape.getArea());
}
}
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