Adding and subtract complex numbers using OOP structure

Question

I have here a code that should print the sum and difference of two complex numbers. The instructions given are:
make the methods add, subtract, and

Answer 1

   public void print(){
     if(this.imag <0){
      System.out.println(this.real+" "+this.imag+"i");
     }
     if(this.imag >0){
      System.out.println(this.real+"+"+this.imag+"i");
     }
    }