Complex in IAVA.(Create Complex class, constructor, method & to add, subtract and multiply two complex numbers and to return the real and imaginary parts)

CODING:

class Complex
{
    double real;
    double imag;
    public Complex(double real, double imag) {
       this.real = real;
        this.imag = imag;
    }
    public static void main(String[] args) {
        Complex o1 = new Complex(5.3, 3.5);
        Complex o2 = new Complex(6.4, 2.0),o3 ;
       o3 = add(o1, o2);
          System.out.printf("Addition = %.1f + %.1fi\n", o3.real, o3.imag);
        o3 = sub(o1, o2);
          System.out.printf("Subtract = %.1f + %.1fi\n", o3.real, o3.imag);
        o3 = mul(o1, o2);
          System.out.printf("Multiply= %.1f + %.1fi", o3.real, o3.imag);
    }
    public static Complex add(Complex o1, Complex o2) {
        Complex o3 = new Complex(0.0, 0.0);
        o3.real = o1.real + o2.real;
        o3.imag = o1.imag + o2.imag;
        return(o3);
    }
    public static Complex sub(Complex o1, Complex o2) {
        Complex o3 = new Complex(0.0, 0.0);
       o3.real = o1.real - o2.real;
        o3.imag = o1.imag - o2.imag;
        return(o3);
    }
    public static Complex mul(Complex o1, Complex o2) {
        Complex o3 = new Complex(0.0, 0.0);
        o3.real = o1.real * o2.real;
        o3.imag = o1.imag * o2.imag;
        return(o3);

    }
}