Complex 运算，complex运算,package numb

Complex 运算，complex运算,package numb

package number.complex;public class Complex {    private double real;    private double img;    /**     * default constructor     */    public Complex() {        this.img = this.real = 0.0;    }    /**     * constructor     *      * @param real     * @param img     */    public Complex(double real, double img) {        this.img = img;        this.real = real;    }    /**     * @param arg     * @return new complex     */    public Complex divide(Complex arg) {        double root = arg.img * arg.img + arg.real * arg.real;        double real = (this.real * arg.real + this.img * arg.img) / root;        double img = (this.real * arg.img - this.img * arg.real) / root;        return new Complex(real, img);    }    /**     * @see java.lang.Object#equals(java.lang.Object)     */    @Override    public boolean equals(Object obj) {        if (obj == null) {            return false;        }        if (this == obj) {            return true;        }        if (!(obj instanceof Complex)) {            return false;        }        Complex other = (Complex) obj;        if (Double.doubleToLongBits(img) != Double.doubleToLongBits(other.img)) {            return false;        }        if (Double.doubleToLongBits(real) != Double                .doubleToLongBits(other.real)) {            return false;        }        return true;    }    /**     * get complex's img part     *      * @return     */    public double getImg() {        return img;    }    /**     * get complex's real part     *      * @return     */    public double getReal() {        return real;    }    /**     * @see java.lang.Object#hashCode()     */    @Override    public int hashCode() {        final int prime = 31;        int result = 1;        long temp;        temp = Double.doubleToLongBits(img);        result = prime * result + (int) (temp ^ (temp >>> 32));        temp = Double.doubleToLongBits(real);        result = prime * result + (int) (temp ^ (temp >>> 32));        return result;    }    /**     * @param arg     * @return new complex     */    public Complex minus(Complex arg) {        return new Complex(this.real - arg.real, this.img - arg.img);    }    /**     * @param arg     * @return new complex     */    public Complex multiply(Complex arg) {        double real = this.real * arg.real - this.img * arg.img;        double img = this.real * arg.img + this.img * arg.real;        return new Complex(real, img);    }    /**     * @param arg     * @return new complex     */    public Complex plus(Complex arg) {        return new Complex(this.real + arg.real, this.img + arg.img);    }    /**     * set comple's img part     *      * @param img     */    public void setImg(double img) {        this.img = img;    }    /**     * set complex's real part     *      * @param real     */    public void setReal(double real) {        this.real = real;    }    /**     *      * @see java.lang.Object#toString()     */    @Override    public String toString() {        return "Complex [real=" + real + ", img=" + img + "]";    }    public static void main(String[] args) {        Complex complex = new Complex(3, 4);        Complex complex1 = new Complex(1, 2);        System.out.println(complex.plus(complex1));        System.out.println(complex.minus(complex1));        System.out.println(complex.divide(complex1));        System.out.println(complex.multiply(complex1));    }    /* result */    // Complex [real=4.0, img=6.0]    // Complex [real=2.0, img=2.0]    // Complex [real=2.2, img=0.4]    // Complex [real=-5.0, img=10.0]}//该片段来自于http://byrx.net