定义复数类。 属性：实数、虚数。方法：复数的加减乘除运算，java

public class ComplexNumber {
private double real;
private double imaginary;

public ComplexNumber(double real, double imaginary) {
this.real = real;
this.imaginary = imaginary;
}

public double getReal() {
return real;
}

public void setReal(double real) {
this.real = real;
}

public double getImaginary() {
return imaginary;
}

public void setImaginary(double imaginary) {
this.imaginary = imaginary;
}

public ComplexNumber add(ComplexNumber other) {
double newReal = this.real + other.real;
double newImaginary = this.imaginary + other.imaginary;
return new ComplexNumber(newReal, newImaginary);
}

public ComplexNumber subtract(ComplexNumber other) {
double newReal = this.real - other.real;
double newImaginary = this.imaginary - other.imaginary;
return new ComplexNumber(newReal, newImaginary);
}

public ComplexNumber multiply(ComplexNumber other) {
double newReal = this.real * other.real - this.imaginary * other.imaginary;
double newImaginary = this.real * other.imaginary + this.imaginary * other.real;
return new ComplexNumber(newReal, newImaginary);
}

public ComplexNumber divide(ComplexNumber other) {
double denominator = other.real * other.real + other.imaginary * other.imaginary;
double newReal = (this.real * other.real + this.imaginary * other.imaginary) / denominator;
double newImaginary = (this.imaginary * other.real - this.real * other.imaginary) / denominator;
return new ComplexNumber(newReal, newImaginary);
}
}