complex类java解决

一个复数是一个形式为a+bi的数，这里的a和b都是实数，i是-1的平方根。数字a和b分别称为复数的实部和虚部。 可以使用下面的公式完成复数的加、减、乘、除：

(a+bi)+(c+di)=(a+c)+(b+d)i;

(a+bi)-(c+di)=(a-c)+(b-d)i;

(a+bi)*(c+di)=(ac-bd)+(ad+bc)i;

(a+bi)/(c+di)=(ac+bd)/(c^2+d^2)+ (bc-ad)/(c^2+d^2)i;

还可以使用下面的公式得到复数的绝对值： |a+bi|=sqrt(a^2+b^2);

设计一个名为Complex的复数类来表示复数以及完成复数运算的add、substract、multiply、divide和 calAbs（绝对值）方法，并且覆盖toString方法以返回一个表示复数的字符串。方法toString返回字符串 a+bi。如果b是0，那么它只返回a。

实现三个构造器：Complex(a, b)、Complex(a)和Complex()。Complex()创建数字0的Complex 对象，而Complex(a)创建一个b为0的Complex对象。 还提供getA()和getB()方法以返回复数的实部和虚部。

编写一个测试程序，提示用户输入两个复数，然后显示它们做加、减、乘、除之后的结果。

import java.util.Scanner;


 class Complex { 
    private double realPart;
    private double imaginPart;

     Complex(double r, double i) { 
        this.realPart = r;
        this.imaginPart = i;
    }

     Complex(double real){ 
        this.realPart=real;
        this.imaginPart=0;
    }

     Complex() { 
        this.realPart = 0;
        this.imaginPart = 0;
    }//3个构造方法//

    public double getB() { 
        return this.imaginPart;
    }//返回imagine的值//

    public double getA() { 
        return this.realPart;
    }//返回real的值//

    public  Complex complexAdd(Complex a) { //传进来的complex a和b类似于c中的指针
        Complex c = new Complex();//定义一个c的complex类给c初始化
        c.realPart = this.realPart + a.realPart;
        c.imaginPart = this.imaginPart + a.imaginPart;
        return c;//返回c这个子类的值//
    }

    public Complex complexSubtract(Complex a) { 
        Complex c = new Complex();
        c.realPart = this.realPart - a.realPart;
        c.imaginPart = this.imaginPart - a.imaginPart;
        return c;
    }//减法//

    public  Complex mutiply(Complex a) { 
        Complex c = new Complex();
        c.realPart = this.realPart * a.realPart - this.imaginPart * a.imaginPart;
        c.imaginPart = this.realPart * a.imaginPart + this.imaginPart * a.realPart;
        return c;
    }

    public  Complex divide(Complex a) { 
        Complex c = new Complex();
        c.realPart = (a.realPart * this.realPart + a.imaginPart * this.imaginPart) / (a.realPart * a.realPart + a.imaginPart * a.imaginPart);
        c.imaginPart = (a.realPart * this.imaginPart - this.realPart * a.imaginPart) / (a.realPart * a.realPart + a.imaginPart * a.imaginPart);
        return c;
    }

    public double calAbs() { 
        double temp = Math.sqrt(this.realPart * this.realPart +this.imaginPart * this.imaginPart);
        return temp;
    }//求模//


    public String toString() { 
        if (this.realPart >= 0 && this.realPart < 0.01) { 
            if (this.imaginPart >= 0 && this.imaginPart < 0.01)
                return "0.00";
            else
                return String.format("%.2fi", this.imaginPart);
        }
        else { 
            if (this.imaginPart >= 0 && this.imaginPart < 0.01)
                return String.format("%.2f", this.realPart);
            else
                if (this.imaginPart > 0)
                return String.format("%.2f+%.2fi", this.realPart, this.imaginPart);
            else
                return String.format("%.2f%.2fi", this.realPart, this.imaginPart);
        }
    }
}

 class Main{ 
    public static void main(String[] args) { 
        Scanner in = new Scanner(System.in);
        double real1=in.nextDouble();
        double image1=in.nextDouble();
        double real2=in.nextDouble();
        double image2=in.nextDouble();
        Complex a=new Complex(real1,image1);
        Complex b=new Complex(real2,image2);
        System.out.printf("Real:%.2f imaginary:%.2f Fabs:%.2f\n",a.getA(),a.getB(),a.calAbs());
        System.out.printf("Real:%.2f imaginary:%.2f Fabs:%.2f\n",b.getA(),b.getB(),b.calAbs());
        System.out.println(a.complexAdd(b));
        System.out.println(a.complexSubtract(b));
        System.out.println(a.mutiply(b));
        System.out.println(a.divide(b));
    }
}

前前后后花了2天时间 看了几十篇CSDN 问了大佬终于解决了 害 铁废物了
不足之处请大家指出改正！