Java基础之异常Exception---测试（带答案）

class NoValueException extends RuntimeException
{
NoValueException(String message)
{
super(message);
}
}

interface Shape
{
void getArea();
}

class Rec implements Shape
{
private int len,wid;

Rec(int len ,int wid)//throws NoValueException
{
if(len<=0 || wid<=0)
throw new NoValueException("出现非法值");

this.len = len;
this.wid = wid;
}

public void getArea()
{
System.out.println(len*wid);
}
}

class Circle implements Shape
{
private int radius;
public static final double PI = 3.14;

Circle(int radius)
{
if(radius<=0)
throw new NoValueException("非法");
this.radius = radius;
}

public void getArea()
{
System.out.println(radius*radius*PI);
}
}

class  ExceptionTest1
{
public static void main(String[] args)
{

Rec r = new Rec(3,4);
r.getArea();

Circle c = new Circle(-8);

System.out.println("over");

}
}