Java实现复数加减乘除

在 Java 中，我们可以定义一个复数类来实现复数的加减乘除运算。下面是一个简单的复数类的实现：

public class Complex {
    private double real;
    private double imag;

    public Complex(double real, double imag) {
        this.real = real;
        this.imag = imag;
    }

    public Complex add(Complex other) {
        double real = this.real + other.real;
        double imag = this.imag + other.imag;
        return new Complex(real, imag);
    }

    public Complex subtract(Complex other) {
        double real = this.real - other.real;
        double imag = this.imag - other.imag;
        return new Complex(real, imag);
    }

    public Complex multiply(Complex other) {
        double real = this.real * other.real - this.imag * other.imag;
        double imag = this.real * other.imag + this.imag * other.real;
        return new Complex(real, imag);
    }

    public Complex divide(Complex other) {
        double denominator = other.real * other.real + other.imag * other.imag;
        double real = (this.real * other.real + this.imag * other.imag) / denominator;
        double imag = (this.imag * other.real - this.real * other.imag) / denominator;
        return new Complex(real, imag);
    }

    public double getReal() {
        return real;
    }

    public double getImag() {
        return imag;
    }

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

在上面的代码中，我们定义了一个 Complex 类，它包含实部和虚部两个成员变量。这个类还包含了四个方法：add、subtract、multiply 和 divide，分别用于实现复数的加、减、乘和除运算。这个类还提供了 getter 方法来获取实部和虚部的值，以及一个 toString 方法来将复数转换成字符串形式。

下面是一个使用这个类的例子：

public class Main {
    public static void main(String[] args) {
        Complex a = new Complex(1, 2);
        Complex b = new Complex(3, 4);

        Complex sum = a.add(b);
        Complex diff = a.subtract(b);
        Complex product = a.multiply(b);
        Complex quotient = a.divide(b);

        System.out.println("a = " + a);
        System.out.println("b = " + b);
        System.out.println("a + b = " + sum);
        System.out.println("a - b = " + diff);
        System.out.println("a * b = " + product);
        System.out.println("a / b = " + quotient);
    }
}

在上面的代码中，我们创建了两个复数对象 a 和 b，并分别进行了加、减、乘和除运算，并将结果输出到控制台上。