5例子18.txt

来自「Java大学实用教程 耿祥义编著 课件 PPT」· 文本 代码 · 共 83 行

class MyException extends Exception
{
    String message;
    MyException()
    {
        message="数字不是正数";
    }
    public String toString()
    {
        return message;
    }
}
class YourException extends Exception
{
    String message;
    YourException()
    {
        message="数字不是偶数";
    }
 public String toString()
    {
        return message;
    }
}
class A
{
    public void f(int n) throws MyException,YourException
    {
      if(n<0)
        {
          throw(new  MyException());             //抛出异常，结束方法的执行。
        }
      if(n%2!=0)
        {
          throw(new  YourException());           //抛出异常,结束方法的执行。
        }
      double number=Math.sqrt(n);
      System.out.println(number);
    }
}
public class Example
{
   public static void main(String args[])
    {
      A a=new A();
     try 
         {
           a.f(9);
         }
      catch(MyException e)
         {
            System.out.println(e.toString());
         }
      catch(YourException e)
         {
            System.out.println(e.toString());
         }
       try 
         {
           a.f(-8);
         }
      catch(MyException e)
         {
            System.out.println(e.toString());
         }
      catch(YourException e)
         {
            System.out.println(e.toString());
         }
       try 
         {
           a.f(16);
         }
      catch(MyException e)
         {
            System.out.println(e.toString());
         }
       catch(YourException e)
         {
            System.out.println(e.toString());
         }
    }
}