异常实验

package Throws;

public class test1 {
    public static void main(String[] args) {
        try {
            Point point=new Point(1,2);
            Point point2=new Point(2,1);
            Point point3=new Point(3,1);
            Rectangle rectangle=new Rectangle(point,2,3);
            Triangle triangle=new Triangle(point,point2,point3);
            Point[] points={point,point2,point3};
            Polygon polygon=new Polygon(points);
        }
       catch (IllegalArgumentException e){
           System.out.println(e.toString());
       }
       finally {
            System.out.println("结束");
        }
    }
}

package Throws;

public class Triangle {
    private static final Point Point = null;
    public Point point2,point3;
    protected double a,b,c;
    public Triangle(Point p1,Point p2,Point p3) throws IllegalArgumentException{
        if(p1.leng()==0||p2.leng()==0||p3.leng()==0){
            throw new IllegalArgumentException() {
                @Override
                public String toString() {
                    return "参数错误请检查Triangle";
                }
            };
        }
        this.point2=p2;
        this.point3=p3;
    }
    public Triangle() {
    }

}

package Throws;

import java.util.Scanner;

public class Rectangle {
    static int length;
    static int width;
    Rectangle(Point point1,int length,int width)throws IllegalArgumentException{
        if(length<0||width<0){
            throw new IllegalArgumentException() {
                @Override
                public String toString() {
                    return "参数错误请检查Rectangle";
                }
            };
        }
        Rectangle.length=length;
        Rectangle.width=width;
    }

}

package Throws;
public class Polygon {
   public Point Point[];
   public Polygon(Point[] points)throws IllegalArgumentException{
       if(points.length<3){
           throw new IllegalArgumentException() {
               @Override
               public String toString() {
                   return "参数错误请检查Polygon";
               }
           };
       }
       Point=points;
    }
}

package Throws;

import java.util.Scanner;

import static java.lang.System.exit;

public class Point {
    static int x;
    static int y;
    Point(int x,int y)throws IllegalArgumentException{
        if(x<0||y<0){
            throw new IllegalArgumentException() {
                @Override
                public String toString() {
                    return "参数错误请检查Point";
                }
            };
        }
        Point.x=x;
        Point.y=y;
    }
    public int leng(){
        return x-y;
    }

}