为什么程序运行完输出的内容是这个？

之前还能正常使用，突然就成这样了，重装过一次但还是没有解决，请求解答！

package csdn008;

/**
 * @author wangfei
 * @version 1.0
 * @date 2022/6/5
 */
public class NeiBuNei {

    double a,b,c;

    public NeiBuNei(double a,double b,double c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    public void volume() {
        System.out.println(a*b*c);
    }


}
class Test {
    public static void main(String[] args) {
        NeiBuNei neiBuNei = new NeiBuNei(1,2,3);
        neiBuNei.volume();
    }
}