关于复数的运算，求大神帮忙看看

Question

编写一个复数类，可以进行复数加法和减法运算。编写一个包含main方法的类（应用程序）测试该复数类。要求该复数类至少包含一个无参的构造方法和一个带参的构造方法；数据成员包括复数的实部和虚部，为double类型；包括两个方法，分别实现复数的加法和减法运算。

代码

import java.util.Scanner;

public class ComplexNum {

double RealNum;

double ImagNum;

public ComplexNum() {

Scanner input=new Scanner(System.in);

RealNum=input.nextDouble();

ImagNum=input.nextDouble();

//ComplexNum(RealNum,ImagNum);

}

public ComplexNum(double RealNum,double ImagNum) {

this.RealNum=RealNum;

this.ImagNum=ImagNum;

    }

public ComplexNum add(ComplexNum b) {

double RealNum1=this.RealNum;

    double ImagNum1=this.ImagNum;

    double LastReal=RealNum+RealNum1;

    double LastImag=ImagNum+ImagNum1;

    ComplexNum result=new ComplexNum(LastReal,LastImag);

    return result;

}

public ComplexNum mul(ComplexNum b) {

double RealNum1=this.RealNum;

    double ImagNum1=this.ImagNum;

    double LastReal=RealNum-RealNum1;

    double LastImag=ImagNum-ImagNum1;

    ComplexNum result=new ComplexNum(LastReal,LastImag);

    return result;

}

public void printf() {

if(ImagNum>0) {

System.out.println(ImagNum+"+"+"j"+RealNum);

}

else if(ImagNum<0) {

System.out.println(ImagNum+"-"+"j"+RealNum);

}

else {

System.out.println(RealNum);

}

}

public static void main(String[] args) {

System.out.println("请输入第一个复数的实部和虚部");

ComplexNum a=new ComplexNum();

System.out.println("请输入第二个复数的实部和虚部");

ComplexNum b=new ComplexNum();

        

ComplexNum add=a.add(b);

ComplexNum mul=a.mul(b);

add.printf();

mul.printf();

}

}

Answer 1

代码怎么了？什么问题？