Java实验报告(2)

}

}

public double area(){ }

return 3.14*r*r;

class RectArea extends Area{ }

class ImpleArea{ }

static double a,b; static void test(){ }

Scanner sc = new Scanner(System.in); System.out.println(\请输入半径：\);

RoundArea A = new RoundArea(sc.nextDouble()); System.out.println(\请输入宽：\); a=sc.nextDouble();

System.out.println(\请输入高：\); b=sc.nextDouble();

RectArea B = new RectArea(a,b); sc.close();

System.out.println(A.area()); System.out.println(B.area()); double a,b;

RectArea(double a,double b){ }

public double area(){ }

return a*b; this.a=a; this.b=b;

5. 编写一个Flyable接口，包含：

方法：double flySpeed()，用于返回最大的飞行速度。并实现该接口.

public class Main {

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}

public static void main(String args[]){ }

A fly = new A();

System.out.println(fly.flyspeed());

interface Flyable{ }

class A implements Flyable{ }

public double flyspeed(){ double speed = 0; /*

* 计算过程 */

return speed; }

public double flyspeed();

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