Sum of the complex number

Code:

import java.util.*;

class complex
{
    int a,b,c,d;
   
  complex(int a,int b,int c,int d){
    this.a=a;
      this.b=b;
      this.c=c;
      this.d=d;
     
  }
 void complex(complex r1)
 {
    int k,n;
    k=a+c;
    n=b+d;
    System.out.println("sum of complex numbers");
      System.out.println(k+"+"+n+"i");
 }
}
class complex1
{
public static void main(String args[])
{
    int a,b,c,d;
    Scanner in=new Scanner(System.in);
      System.out.println("enter the real number of first complex number");
    a=in.nextInt();
     System.out.println("enter the imaginary number of first complex number");
    b=in.nextInt();
     System.out.println("enter the real number of second complex number");
    c=in.nextInt();
     System.out.println("enter the imaginary number of second complex number");
    d=in.nextInt();
 complex r1=new complex(a,b,c,d);
 r1.complex(r1);
}
}

Output: