Java实现复数相乘

在Java中，我们可以创建一个名为`ComplexNumber`的类来表示复数，并提供相应的加法、减法、乘法等操作，包括复数之间的相乘。以下是一个简单的例子：

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

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

    // 复数相乘的运算
    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);
    }

    @Override
    public String toString() {
        return "(" + real + " + " + imaginary + "i)";
    }

    // getter and setter methods for real and imaginary parts
}

// 示例
public static void main(String[] args) {
    ComplexNumber c1 = new ComplexNumber(2, 3);
    ComplexNumber c2 = new ComplexNumber(4, -5);

    ComplexNumber result = c1.multiply(c2);
    System.out.println("Multiplication of (" + c1 + ") and (" + c2 + ") is: " + result);
}

在这个示例中，`multiply`方法接收另一个`ComplexNumber`作为参数，通过标准的复数乘法规则计算出新的实部和虚部。然后创建一个新的`ComplexNumber`实例返回结果。