Java二元一次方程求解

package cn.edu.xaut;
import java.util.Map;
public class Equation2 {
    private static float x1;
    private static float x2;
    private static float x;
    private static float real;
    private static float imag;
    private static float[] results;
    private static float a;

    private static float b;
    private static float c;

    private static float delt;

     public static void calc(float w,float p,float q){
         results=new float[2];
         a=w; b=p; c=q;
         if(0.0f==a){ //bx+c=0; x=-c/b;

             if(0.0f!=b){
                x=-c/b;
                results[0]=x;
             }else{
                 System.err.println("不是一个方程！");
                 return;
             }

         }else{
             delt=b*b-4*a*c;
             if(delt>=0){
                x1=(float) ((-b+Math.sqrt(delt))/(2*a));
                x2=(float) ((-b-Math.sqrt(delt))/(2*a));
                results[0]=x1;
                results[1]=x2;
             }else{
                 real=-b/(2*a);
                 imag=(float) (Math.sqrt(-delt)/(2*a));
                 results[0]=real;
                 results[1]=imag;
             }
         }
     }

     public static void print(){
         if(0.0f==a){
             if(0.0f!=b){
                 System.out.println("该方程是一元一次方程，其根为：x="+results[0]);
             }else{
                 System.err.println("不是一个方程！");
             }
         }else{
             if(delt>=0){
                 System.out.println("该方程是一元二次方程，两根分别为：x1="+results[0]+",x2="+results[1]);
             }else{
                 System.out.println("该一元二次方程的根为复数,两根分别为:x1="+results[0]+"+"+results[1]+"i"+",x2="+results[0]+"-"+results[1]+"i");
             }
         }
     }

     public static void main(String[] args) {
            float a=1.0f;
            float b=2.0f;
            float c=2.0f;
            Equation2.calc(a,b,c);
            Equation2.print();
            Math.sqrt(a);
        }
}