实验九—抛出异常

最新推荐文章于 2020-09-27 17:56:29 发布

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最新推荐文章于 2020-09-27 17:56:29 发布

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原文链接：http://www.cnblogs.com/zrwhaha/p/10928531.html

此博客展示了一段Java代码，定义了point、rectangle、triangle和polygon等类。在创建这些类的对象时，会对输入参数进行检查，若参数不合法，如坐标为负、边长为负等，将抛出IllegalArgumentException异常。

package 实验包;
public class error {
public static void main(String[] args) {
  point point1=new point(1,2);
  point point2=new point(1,2);
  point point3=new point(1,2);
  rectangle rectangle1=new rectangle(point1,0,0);
  triangle t=new triangle(point1,point2,point3);
  point pointx[]= new point[]{point1,point2};
  polygon polygonx=new polygon(pointx);
}
}

class point{
point(){}
int x,y;
public point(int x,int y)throws IllegalArgumentException
{
  this.x=x;
  this.y=y;
  if(x<0||y<0){
   throw new IllegalArgumentException("抛出无效参数,异常");
  }
}
}

class rectangle extends point{
public rectangle(point point1,int length,int width)throws IllegalArgumentException
{
  if(length<0||width<0){
   throw new IllegalArgumentException("抛出无效参数,异常");
  }
}
}

class triangle extends point{
public triangle(point point1,point point2,point point3)throws IllegalArgumentException
{
  if((point1.x==point2.x)&&(point1.x==point3.x)&&(point1.y==point2.y)&&(point1.y==point3.y)){
   throw new IllegalArgumentException("抛出无效参数,异常");
  }
}
}

class polygon extends point{

public polygon(point[] points)throws IllegalArgumentException {

if(points.length<3){

throw new IllegalArgumentException("抛出无效参数,异常");

}