实现一个求解一元二次方程的类，该类包含三个成员变量和一个求解一元二次方程解的函数，该函数需要抛出异常（1.无解的异常 2二次项...

package homework04; public class Function { private int a; private int b; private int c; private double x1; private double x2; public Function(int a ,int b,int c) { this.a = a; this.b = b; this.c = c; } public double getD(){ return (this.b*this.b-4*this.a*this.c); } public int getA() { return a; } public void setA(int a) { this.a = a; } public int getB() { return b; } public void setB(int b) { } public int getC() { return c; } public void setC(int c) { this.c = c; } public double getX1() { return x1; } public void setX1(double x1) { this.x1 = x1; } public double getX2() { return x2; } public void setX2(double x2) { this.x2 = x2; } public void fun() throws Exception{ if(this.a != 0) { double m = this.getD(); if(m > 0) { x1 = (-this.b+Math.sqrt(m))/(2*this.a); x2 = (-this.b-Math.sqrt(m))/(2*this.a); System.out.println("此方程有两个不同的解"); } if(m==0) { x1 = -this.b/(2*this.a); System.out.println("此方程有两个相同的解"); } if(m < 0) { Exception e1 = new Exception("方程无解"); throw e1; } } else { Exception e2 = new Exception("二次项系数为0"); throw e2; } } }