Класс Комплексных чисел

public class  ComplexNumber {
    private int real ;
    private int imaginary;

    public class  ComplexNumber {
    private int real ;
    private int imaginary;

    ComplexNumber(){
        this.real  = this.imaginary = 0;
    }
    ComplexNumber(int real, int imaginary){
        this.setReal(real);
        this.setImaginary(imaginary);
    }

    public void  setReal  (int real){
        this.real = real; // прим. ты вызываешь этот же метод бесконечное количество раз
    }

    public void setImaginary (int imaginary){
        this.imaginary = imaginary; // прим. то же самое, что для setReal
    }

    public int getReal  (){
        return this.real ;
    }

    public int getImaginary (){
        return this.imaginary;
    }

    public double module (int real, int imaginary){
        double m = Math.sqrt(Math.pow(real,2)+Math.pow(imaginary,2));
        return m;
    }

    public ComplexNumber sum (ComplexNumber num){
        return new ComplexNumber(this.real+num.real, this.imaginary+ num.imaginary);
    }

    public ComplexNumber multiply (ComplexNumber num){
        ComplexNumber number = new ComplexNumber(this.real*num.real-this.imaginary*num.imaginary,
                this.real*num.imaginary-this.imaginary*num.real);
        return number;
    }

    public ComplexNumber subtraction (ComplexNumber num){
        return new ComplexNumber(this.real-num.real, this.imaginary-num.imaginary);
    }
 }