实验九：异常的抛出、捕获并处理

实验九：异常的抛出、捕获并处理

package w;

public class T {
  public static void main(String[] args) {
   
    point p1=new point(0,0);
    point p2=new point(1,0);
    point p3=new point(0,1);
    rectangle r=new rectangle(p1,5,6);
    triangle t=new triangle(p1,p2,p3);
    point[] point= {p1,p2};
    new polygon(point);
   }
  }
   class point
   {
    int x;
    int y;
    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
   {
    int length;
    int width;
    public rectangle(point point1,int length,int width)throws IllegalArgumentException
    {
     this.length=length;
     this.width=width;
     if(length<0||width<0)
      throw new IllegalArgumentException("无效参数");
    }
   }
   class triangle extends point
   {
    public triangle(point point1,point point2,point point3)throws IllegalArgumentException
    {
     if(Math.sqrt(Math.pow((point1.x-point2.x), 2)+Math.pow((point1.y-point2.y), 2))-Math.sqrt(Math.pow((point2.x-point3.x), 2)+Math.pow((point2.y-point3.y), 2))<Math.sqrt(Math.pow((point1.x-point3.x), 2)+Math.pow((point1.y-point3.y), 2)))
      if(Math.sqrt(Math.pow((point1.x-point3.x), 2)+Math.pow((point1.y-point3.y), 2))-Math.sqrt(Math.pow((point2.x-point3.x), 2)+Math.pow((point2.y-point3.y), 2))<Math.sqrt(Math.pow((point1.x-point2.x), 2)+Math.pow((point1.y-point2.y), 2)))
       if(Math.sqrt(Math.pow((point1.x-point2.x), 2)+Math.pow((point1.y-point2.y), 2))-Math.sqrt(Math.pow((point1.x-point3.x), 2)+Math.pow((point1.y-point3.y), 2))<Math.sqrt(Math.pow((point2.x-point3.x), 2)+Math.pow((point2.y-point3.y), 2)))
        throw new IllegalArgumentException("无效参数");
    }
   }
   class polygon extends point
   {
    public polygon(point[] points)throws IllegalArgumentException
    {
     int i;
     i=points.length;
     if(i<=2)
      throw new IllegalArgumentException(无效参数");
    }
   }

心得体会：

做本次实验时，由于自己不是很懂，所以向同学询问了本次实验的要点，讲解后，大概了解了异常抛出，捕获和处理的大概方法，但无法得出明确的方法，在完成实验后，我会继续思考本次实验，直到自己完全懂，