java编程题之异常处理

设计一个一元二次方程类,并为这个类添加异常处理

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.lang.Math;
class  Equation
{
    public static void main(String[] args)
    {
        InputStreamReader read = new InputStreamReader(System.in);
        BufferedReader buf = new BufferedReader(read);
        int a=0,b=0,c=0;
        double x1,x2;
        System.out.println("请依次输入a,b,c的值，我们将会为你计算方程ax*x+bx+c=0的根（如果存在的话）");
        try
        {
            for(int i = 0;i < 3;i++)
            {
                if(i == 0)
                    a = Integer.parseInt(buf.readLine());
                else
                {
                    if(i == 1)
                        b = Integer.parseInt(buf.readLine());
                    else
                        c = Integer.parseInt(buf.readLine());
                }
            }
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
        if (b*b-4*a*c<0)
        {
            System.out.println("方程"+a+"x^2+"+b+"x"+c+"=0无解");
        }
        else
        {
            x1 = (-b+Math.sqrt(b*b-4*a*c))/2*a;
            x2 = (-b-Math.sqrt(b*b-4*a*c))/2*a;
            System.out.println("方程"+a+"x^2+"+b+"x+"+c+"=0的根:");
            System.out.println("x1="+x1+","+"x2="+x2);
        }

    }

}