ComplexNumber

public final class ComplexNumber {
    private final double re;
    private final double im;

    public ComplexNumber(double re, double im) {
        this.re = re;
        this.im = im;
    }

    public double getRe() {
        return re;
    }

    public double getIm() {
        return im;
    }

    @Override
    public int hashCode() {
        final double prime = 31.0;
        double result = 1.0;
        result = prime * result + re;
        result = prime * result + im;
        return (int)result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ComplexNumber other = (ComplexNumber) obj;
        if (re != other.getRe())
            return false;
        if (im != other.getIm())
            return false;
        return true;
    }
}