Complex Number implementation using oops java, Java

Complex Number implementation using oops java

/*package whatever //do not write package name here */

import java.io.*;
import java.util.*;
import java.lang.*;
class ComplexNumber{
    private int real;
    private int img;
    public ComplexNumber(int real,int  img)
    {
        this.real=real;
        this.img=img;
    }
    public int getImaginary()
    {
        return img;
    }
     public int getReal()
    {
        return real;
    }
    public void setReal(int r)
    {
        this.real=r;
    }
    public void setImaginary(int i)
    {
        this.img=i;
    }
    public void print()
    {
        if(img==0)
        {
            System.out.println(real);
        }
        else
        {
            if(img>0)
            System.out.println(real+" + i"+img);
            else
            System.out.println(real+" - i"+(-1)*(img));
        }
    }
    public void addComplex(ComplexNumber c2)
    {
        this.real=this.real+c2.real;
        this.img=this.img+c2.img;
        
    }
    public static ComplexNumber add(ComplexNumber c1,ComplexNumber c2)
    {
        int x=c1.real+c2.real;
        int y=c1.img+c2.img;
        ComplexNumber c=new ComplexNumber(x,y);
        return c;
    }
    public void multiply(ComplexNumber c)
    {
        int x=this.real;
        int y=this.img;
        int a=c.real;
        int b=c.img;
        int r=x*a-y*b;
        int i=y*b+a*x;
        this.real=r;
        this.img=i;
    }
    
    public static ComplexNumber conjugate(ComplexNumber c)
    {
        int r=c.real;
        int i=c.img;
        i=(-1)*i;
        ComplexNumber c1=new ComplexNumber(r,i);
        return c1;
    }
    
}
class Rextester {
	public static void main (String[] args) {
	   ComplexNumber c1=new ComplexNumber(2,3);
	   c1.print();
	   c1.setReal(10);
	   c1.setImaginary(30);
	   c1.print();
	   ComplexNumber c2=new ComplexNumber(20,50);
	   c1.addComplex(c2);
	   c1.print();
	    ComplexNumber c3=new ComplexNumber(2,2);
	    c1.multiply(c3);
	    c1.print();
	    ComplexNumber c4=ComplexNumber.add(c2,c3);
	    c4.print();
	    ComplexNumber c5=ComplexNumber.conjugate(c4);
	    c5.print();
	}
}


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