a+bi is the common form of a complex number. Here number part ‘a’ is known as ‘real part’ and b is known as imaginary part. If a+bi and c+di are two complex numbers, then its sum is (a+c) + (b+d)i.

This is a java console program to add any two complex numbers by user.
Here class name is ‘complex’, so you should save your file with name ‘complex.java’.

 import java.io.*; class complex {   int real1,imag1,real2,imag2; void get() throws IOException   {       BufferedReader Br = new BufferedReader(new InputStreamReader(System.in));      System.out.print("\n Enter the real part of first complex number: ");      real1=Integer.parseInt(Br.readLine()); System.out.print(" Enter the imaginary part of first complex number: ");      imag1=Integer.parseInt(Br.readLine()); System.out.print("\n Enter the real part of second complex number: ");      real2=Integer.parseInt(Br.readLine()); System.out.print(" Enter the imaginary part of second complex number :  ");      imag2=Integer.parseInt(Br.readLine());   } void display()   {         System.out.println(" \n Sum of complex numbers " + real1 + "+" + imag1 + "i and "  + real2 + "+" + imag2 + "i is " + (real1+real2) + "+" + (imag1+imag2) + "i");   } public static void main(String p[]) throws IOException  {    complex cmp = new complex();    cmp.get();    cmp.display();  } }

Sample output:

Enter the real part of first complex number : 2
Enter the imaginary part of first complex number : 3

Enter the real part of second complex number : 5
Enter the imaginary part of second complex number : 7

Sum of complex numbers 2+3i and 5+7i is 7+10i