java求解二元一次方程

可以使用以下代码求解二元一次方程：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入二元一次方程的系数：");
        System.out.print("a=");
        double a = scanner.nextDouble();
        System.out.print("b=");
        double b = scanner.nextDouble();
        System.out.print("c=");
        double c = scanner.nextDouble();
        double delta = b * b - 4 * a * c;
        if (delta < ) {
            System.out.println("方程无实数解！");
        } else if (delta == ) {
            double x = -b / (2 * a);
            System.out.println("方程有唯一解，x=" + x);
        } else {
            double x1 = (-b + Math.sqrt(delta)) / (2 * a);
            double x2 = (-b - Math.sqrt(delta)) / (2 * a);
            System.out.println("方程有两个实数解，x1=" + x1 + "，x2=" + x2);
        }
    }
}