实验八 实验九

Posted 2021-12-08 myb1128

实验八：

源代码：

package 计算圆锥体面积;

class abc extends yuanzhuiti implements Area,Volume {

final double PI=3.14;
public double volume(double r,double h) {
double v;
v=r*h/3;
return v;
}
public double area(double r,double l) {
double a;
a=PI*r*l+PI*r*r;
return a;
}
}
public class yuanzhuiti{
public static void main(String[] args) {

abc a=new abc();
abc b=new abc();
System.out.println("圆锥体A的面积为:"+a.area(2, 4));
System.out.println("圆锥体A的体积为:"+a.volume(3, 6));
System.out.println("圆锥体B的面积为:"+b.area(3, 6));
System.out.println("圆锥体B的体积为:"+b.volume(4, 8));
System.out.println("体积较大的是:"+Math.max(a.area(3, 6), b.volume(4, 8)));
}
}

package 计算圆锥体面积;

public interface Area{
public abstract double area(double r,double l);
}

package 计算圆锥体面积;

 

public interface Volume {
public abstract double volume(double r,double h);
}

 

结果：

实验九：

源代码：

package 抛出异常;

public class 实验 {
public static void main(String[] args) {
point p=new point(1,3);
point p1=new point(1,2);
point p2=new point(1,1);
rectangle r=new rectangle(p,5,6);
triangle t=new triangle(p,p1,p2);
}

}
class point {
public int x,y;
public point() {}
public point(int x,int y)throws IllegalArgumentException
{
this.x=x;
this.y=y; 

if(x<0||y<0)
throw new IllegalArgumentException("无效参数");
}
}
class rectangle extends point{
public int width,length;
//public point point1(3,6);
public rectangle(point point1,int length,int width)throws IllegalArgumentException
{

this.length=length;
this.width=width;
if(length<0||width<0)
throw new IllegalArgumentException("参数无效");
}
} 
class triangle extends point{
public triangle(point point1,point point2,point point3)throws IllegalArgumentException
{
if(((point1.x-point2.y)-(point2.x-point1.y))+((point2.x-point3.y)-(point3.x-point2.y))+((point3.x-point1.y)-(point3.y-point1.x))==0)
throw new IllegalArgumentException("无效的参数");
}
}

 

实验结果：