用Java编写一个复数加减乘除的代码并举例运行

在Java中，我们可以创建一个名为`ComplexNumber`的类来表示复数，并提供加、减、乘、除的方法。首先，我们需要包含两个double类型的成员变量来存储实部和虚部。这里是一个简单的实现：

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

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

    // Getters and Setters for real and imaginary parts

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

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

    // 乘法
    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);
    }

    // 除法，假设其他数不为0
    public ComplexNumber divide(ComplexNumber other) {
        double denominator = Math.pow(other.real, 2) + Math.pow(other.imaginary, 2);
        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);
    }
}

// 示例
public static void main(String[] args) {
    ComplexNumber c1 = new ComplexNumber(2, 3);
    ComplexNumber c2 = new ComplexNumber(-1, 4);

    System.out.println("c1: (" + c1.real + ", " + c1.imaginary + ")");
    System.out.println("c2: (" + c2.real + ", " + c2.imaginary + ")");

    ComplexNumber sum = c1.add(c2);
    System.out.println("Addition: " + sum.toString());

    ComplexNumber diff = c1.subtract(c2);
    System.out.println("Subtraction: " + diff.toString());

    ComplexNumber product = c1.multiply(c2);
    System.out.println("Multiplication: " + product.toString());

    if (!c2.isZero()) { // 检查除数是否为零
        ComplexNumber quotient = c1.divide(c2);
        System.out.println("Division: " + quotient.toString());
    } else {
        System.out.println("Cannot divide by zero.");
    }
}

在这个例子中，我们创建了两个复数`c1`和`c2`，然后演示了如何通过`add`, `subtract`, `multiply`, 和`divide`方法来进行操作。注意，对于除法，我们在计算之前检查了除数是否为零，以避免异常。