package sampl1;

public class Complex {

double real;
double img;
public double getReal() {
    return real;
}
public void setReal(double real) {
    this.real = real;
}
public double getImg() {
    return img;
}
public void setImg(double img) {
    this.img = img;
}
public Complex() {
    real=1;
    img=2;
}
public Complex(double img, double real) {
    super();
    this.img = img;
    this.real = real;
}
public Complex addComplex(Complex c2)
{
    Complex c3=new Complex();
    c3.real=real+c2.real;
    c3.img=img+c2.img;
    return c3;
}
public Complex subComplex(Complex c2)
{
    Complex c3=new Complex();
    c3.real=real-c2.real;
    c3.img=img-c2.img;
    return c3;
}
public Complex mulComplex(Complex c2)
{
    Complex c3=new Complex();
    c3.real=((real*c2.real)-(c2.img * img));
    c3.real=((real*c2.img)+(c2.real*img));
    return c3;
}
public Complex divComplex(Complex c2)
{
    Complex c3=new Complex();
    c3.real=((real*c2.real) - (img*c2.img))/((c2.real * c2.real) - (c2.img* c2.img));
    c3.img=((real*c2.img)+(c2.real*img))/((c2.real*c2.real) - (c2.img*c2.img));
    return c3;
}
public void showComplex()
{
    System.out.println("The Complex number is: " + real +"+i"+img);
}

}

Please visit the following link:

Implement ComplexNumber class

i write this programe me but when i run the programe it dosn't make the calculation (add, subtract...ect) could any one have a look this programe and tell me where is the error? this programe written in two class (one with constractor and metheod and one with the main)

*this is the first class.

public class Complex {

private double real;
private double img;

public  Complex(){

}

public double getReal()
{   
    return real;
    }
public void setReal(double real)
{   
    this.real = real;
    }
public double getImg()
{   
    return img;
    }
public void setImg(double img)
{
    this.img = img;
    }


public Complex(double img, double real)
{
    super();
    this.img = img;
    this.real = real;
    }
public Complex add(Complex c2)
{
    Complex c3=new Complex();
    c3.real=real+c2.real;
    c3.img=img+c2.img;  
    return c3;
    }
public Complex subtract(Complex c2)
{
    Complex c3=new Complex();
    c3.real=real-c2.real; 
    c3.img=img-c2.img;
    return c3;
    }
public Complex multiply(Complex c2)
{
    Complex c3=new Complex();   
    c3.real=((real*c2.real)-(c2.img * img));
    c3.real=((real*c2.img)+(c2.real*img));  
    return c3;
    }
public Complex divide(Complex c2)
{
    Complex c3=new Complex();
    c3.real=((real*c2.real) - (img*c2.img))/((c2.real * c2.real) - (c2.img* c2.img));
    c3.img=((real*c2.img)+(c2.real*img))/((c2.real*c2.real) - (c2.img*c2.img));  
    return c3;
    }
public void display(){    
    System.out.println("Reasult: " + real +"+i"+img);
    }

}

*this is the seconed class with the main import java.util.Scanner;

public class Test {

public static void main(String[] args) {



            System.out.println ("Choose an operation :\n");
            System.out.println (" 1. Add \n");
            System.out.println (" 2. Subtract \n");
            System.out.println (" 3. Multiply \n");
            System.out.println (" 4. Divide \n");
            System.out.println (" 5. Exit \n");

            Scanner input = new Scanner (System.in);
            Complex complexNum = new Complex ();

            int choose = input.nextInt();
            System.out.println(" Enter first number (real and imaginary parts): \n ");
            double R1= input.nextInt();
            double I1= input.nextInt();
            complexNum.setReal(R1);
            complexNum.setImg(I1);


            System.out.println(" Enter second number (real and imaginary parts): \n");
            double R2= input.nextInt();
            double I2= input.nextInt();
            complexNum.setReal(R2);
            complexNum.setImg(I2);


            if(choose == 1)
                complexNum.add(complexNum);


        if (choose ==2)
            complexNum.subtract(complexNum);

        if (choose == 3)
            complexNum.multiply(complexNum);
        if (choose ==4)
            complexNum.divide(complexNum);
        if(choose == 5)
            //complexNum.Exit(0);
        complexNum.display();

        }





    }