Java创建一个复数类创建一个执行复数运算的Complex类.复数具有如下格式：realPart+imaginary*j

package table;

public class Complex
{
x09double real;
x09double imaginary;
x09public static final Complex ZERO = new Complex (0, 0);
x09public static final Complex ONE = new Complex (1, 0);
x09public static final Complex I = new Complex (0, 1);

x09public Complex ( double real, double imaginary )
x09{
x09x09this.real = real;
x09x09this.imaginary = imaginary;
x09}

x09public double magnitude ()
x09{
x09x09return Math.sqrt (this.real * this.real + this.imaginary * this.imaginary);
x09}

x09public Complex negative ()
x09{
x09x09return new Complex (-real, -imaginary);
x09}

x09public double valueOf ()
x09{
x09x09return this.real;
x09}

x09public Complex add ( Complex a, Complex b )
x09{
x09x09return new Complex (a.real + b.real, a.imaginary + b.imaginary);
x09}

x09public Complex subtract ( Complex a, Complex b )
x09{
x09x09return new Complex (a.real - b.real, a.imaginary - b.imaginary);
x09}

x09public Complex multiply ( Complex a, Complex b )
x09{
x09x09return new Complex (a.real * b.real - a.imaginary * b.imaginary, a.real * b.imaginary + a.imaginary * b.real);
x09}

x09@Override
x09public String toString ()
x09{
x09x09StringBuilder builder = new StringBuilder ();
x09x09builder.append ("Complex [real=").append (real).append (", imaginary=").append (imaginary).append ("]");
x09x09return builder.toString ();
x09}
}