complex

package learningjava;


public class ComplexNumber {

    public final static ComplexNumber I = new ComplexNumber(0., 1.);
    public final static ComplexNumber ZERO = new ComplexNumber(0.);
    public final static ComplexNumber ONE = new ComplexNumber(1.);
    private double re;
    private double im;

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

    public ComplexNumber() {
        this(0., 0.);
    }

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

    public ComplexNumber(double re) {
        this(re, 0.);
    }

    public double getRe() {
        return this.re;
    }

    public void setRe(double re) {
        this.re = re;
    }

    public double getIm() {
        return this.im;
    }

    public void setIm(double im) {
        this.im = im;
    }

    public String toString() {
        if(this.im == 0)
            return "" + this.re;
        return "(" + this.re + ";" + this.im + ")";
    }

    public double getModulus() {
        return Math.sqrt(this.re * this.re + this.im * this.im);
    }

    public void addTo(ComplexNumber z) {
        this.re += z.re;
        this.im = this.im + z.im;
    }

    public ComplexNumber getConjugate() {
        ComplexNumber z = new ComplexNumber(this.re, -this.im);
        return z;
    }

    public static ComplexNumber add(ComplexNumber z1, ComplexNumber z2) {
        ComplexNumber z3 = new ComplexNumber(z1.re + z2.re, z1.im + z2.im);
        return z3;
    }
    public ComplexNumber multiplyByC(double c) {
        return new ComplexNumber(this.re * c, this.im * c);
    }
    public static ComplexNumber multiply(ComplexNumber z1, ComplexNumber z2) {
        return new ComplexNumber((z1.re*z2.re) - (z1.im * z2.im), (z1.re*z2.im) + (z1.im*z2.re));
    }

    public static void main(String[] args) {
        ComplexNumber z = new ComplexNumber(1);
        System.out.println(z);
        System.out.println(z.getModulus());
        ComplexNumber z2 = new ComplexNumber(0, 1);
        z.addTo(z2);
        System.out.println(z);
        ComplexNumber z1 = z.getConjugate();
        System.out.println(z1);

        ComplexNumber z4 = ComplexNumber.add(z1, z2);
        System.out.println(z4);
    }

}