Java与模式(事例代码)--阎宏版本

package com.javapatterns.immutable.complex; final public class Complex1 extends Number implements java.io.Serializable, Cloneable, Comparable { /** * The imaginary unit. */ static final public Complex1 i = new Complex1(0.0, 1.0); /** * Real part of the Complex. */ private double re; /** * Imaginary part of the Complex. */ private double im; /** * String used in converting Complex to String. */ public static String suffix = "i"; /** * Constructs a Complex equal to the argument. * @param z A Complex object * If z is null then a NullPointerException is thrown. */ public Complex1(Complex1 z) { re = z.re; im = z.im; } /** * Constructs a Complex with real and imaginary parts given * by the input arguments. * @param re A double value equal to the real part of the Complex object. * @param im A double value equal to the imaginary part of the Complex object. */ public Complex1(double re, double im) { this.re = re; this.im = im; } /** * Constructs a Complex with a zero imaginary part. * @param re A double value equal to the real part of the Complex object. */ public Complex1(double re) { this.re = re; this.im = 0.0; } /** * Constructs a Complex equal to zero. */ public Complex1() { re = 0.0; im = 0.0; } /** * Compares with another Complex. * <p><em>Note: To be useful in hashtables this method * considers two NaN double values to be equal. This * is not according to IEEE specification.</em> * @param z A Complex object. * @return True if the real and imaginary parts of this object * are equal to their counterparts in the argument; false, otherwise. */ public boolean equals(Complex1 z) { return (re == z.re && im == z.im); } /** * Compares this object against the specified object. * @param obj The object to compare with. * @return True if the objects are the same; false otherwise. */ public boolean equals(Object obj) { if (obj == null) { return false; } else if (obj instanceof Complex) { return equals((Complex)obj); } else { return false; } } /** * Returns a hashcode for this Complex. * @return A hash code value for this object. */ public int hashCode() { long re_bits = Double.doubleToLongBits(re); long im_bits = Double.doubleToLongBits(im); return (int)((re_bits^im_bits)^((re_bits^im_bits)>>32)); } /** * Returns the value of the real part as a short. */ public short shortValue() { return (short)re; } /** * Returns the real part of a Complex object. * @return The real part of z. */ public double real() { return re; } /** * Returns the imaginary part of a Complex object. * @param z A Complex object. * @return The imaginary part of z. */ public double imag() { return im; } /** * Returns the value of the real part as an int. */ public int intValue() { return (int)re; } /** * Returns the value of the real part as a byte. */ public byte byteValue() { return (byte)re; } /** * Returns the value of the real part as a long. */ public long longValue() { return (long)re; } /** * Returns the value of the real part as a float. */ public float floatValue() { return (float)re; } /** * Returns the value of the real part as a double. */ public double doubleValue() { return re; } /** * Compares this Complex to another Object. If the Object is a Complex, * this function behaves like compareTo(Complex). Otherwise, it throws * a ClassCastException (as Complex objects are comparable only to other * Complex objects). */ public int compareTo(Object obj) { return compareTo((Complex)obj); } /** * Compares two Complex objects. * <P>A lexagraphical ordering is used. First the real parts are compared * in the sense of Double.compareTo. If the real parts are unequal this * is the return value. If the return parts are equal then the comparison * of the imaginary parts is returned. * @return The value 0 if z is equal to this Complex; * a value less than 0 if this Complex is less than z; * and a value greater than 0 if this Complex is greater * than z. */ public int compareTo(Complex1 z) { int compare = new Double(re).compareTo(new Double(z.re)); if (compare == 0) { compare = new Double(im).compareTo(new Double(z.im)); } return compare; } /** * Returns the real part of a Complex object. * @param z A Complex object. * @return The real part of z. */ public static double real(Complex1 z) { return z.re; } /** * Returns the imaginary part of a Complex object. * @param z A Complex object. * @return The imaginary part of z. */ public static double imag(Complex1 z) { return z.im; } /** * Returns the negative of a Complex object, -z. * @param z A Complex object. * @return A newly constructed Complex initialized to * the negative of the argument. */ public static Complex1 negate(Complex1 z) { return new Complex1(-z.re, -z.im); } /** * Returns the complex conjugate of a Complex object. * @param z A Complex object. * @return A newly constructed Complex initialized to complex conjugate of z. */ public static Complex1 conjugate(Complex1 z) { return new Complex1(z.re, -z.im); } /** * Returns the sum of two Complex objects, x+y. * @param x A Complex object. * @param y A Complex object. * @return A newly constructed Complex initialized to x+y. */ public static Complex1 add(Complex1 x, Complex1 y) { return new Complex1(x.re+y.re, x.im+y.im); } /** * Returns the sum of a Complex and a double, x+y. * @param x A Complex object. * @param y A double value. * @return A newly constructed Complex initialized to x+y. */ public static Complex1 add(Complex1 x, double y) { return new Complex1(x.re+y, x.im); } /** * Returns the sum of a double and a Complex, x+y. * @param x A double value. * @param y A Complex object. * @return A newly constructed Complex initialized to x+y. */ public static Complex1 add(double x, Complex1 y) { return new Complex1(x+y.re, y.im); } /** * Returns the difference of two Complex objects, x-y. * @param x A Complex object. * @param y A Complex object. * @return A newly constructed Complex initialized to x-y. */ public static Complex1 subtract(Complex1 x, Complex1 y) { return new Complex1(x.re-y.re, x.im-y.im); } /** * Returns the difference of a Complex object and a double, x-y. * @param x A Complex object. * @param y A double value. * @return A newly constructed Complex initialized to x-y. */ public static Complex1 subtract(Complex1 x, double y) { return new Complex1(x.re-y, x.im); } /** * Returns the difference of a double and a Complex object, x-y. * @param x A double value. * @param y A Complex object. * @return A newly constructed Complex initialized to x-y.. */ public static Complex1 subtract(double x, Complex1 y) { return new Complex1(x-y.re, -y.im); } /** * Returns the product of two Complex objects, x*y. * @param x A Complex object. * @param y A Complex object. * @return A newly constructed Complex initialized to x*y. */ public static Complex1 multiply(Complex1 x, Complex1 y) { return new Complex1(x.re*y.re-x.im*y.im, x.re*y.im+x.im*y.re); } /** * Returns the product of a Complex object and a double, x*y. * @param x A Complex object. * @param y A double value. * @return A newly con