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圆类
package area20240711; public class Circle extends Picture{ private double r; private final double PI = 3.1415926; public Circle(){} public Circle(double r) { this.r = r; } public double getR() { return r; } public void setR(double r) { this.r = r; } public double getPI() { return PI; } @Override public double length() { return 2 * PI * this.r; } @Override public double area() { return this.r * this.r * PI; } } 图形类
package area20240711; public abstract class Picture { public abstract double length(); public abstract double area(); } 矩形类
package area20240711; public class Rectangle extends Picture{ private double length; private double width; public Rectangle(){} public Rectangle(double length, double width) { this.length = length; this.width = width; } public double getLength() { return length; } public void setLength(double length) { this.length = length; } public double getWidth() { return width; } public void setWidth(double width) { this.width = width; } @Override public double length() { return 2.0 * (this.length + this.width); } @Override public double area() { return this.length * this.width * 1.0; } } 测试
package area20240711; import java.util.Scanner; public class AreaTest { public static void main(String[] args) { Scanner sc = new Scanner(System.in); // 创建一个矩形 Rectangle rtg = creatRectangle(); System.out.println("长为" + rtg.getLength() + "宽为" + rtg.getWidth() + "的矩形的周长是" + rtg.length()); System.out.println("长为" + rtg.getLength() + "宽为" + rtg.getWidth() + "的矩形的面积是" + rtg.area()); // 创建一个圆形 Circle c = creatCircle(); System.out.println("半径为" + c.getR() + "圆的周长是" + c.length()); System.out.println("半径为" + c.getR() + "圆的面积是" + c.area()); } public static Rectangle creatRectangle () { Scanner sc = new Scanner(System.in); System.out.println("请输入矩形的长"); double length = sc.nextDouble(); System.out.println("请输入矩形的宽"); double width = sc.nextDouble(); return new Rectangle(length, width); } public static Circle creatCircle() { Scanner sc = new Scanner(System.in); System.out.println("请输入圆形的半径"); double r = sc.nextDouble(); return new Circle(r); } }
