定义一个复数类，完成复数的加、减、乘和除法运算，并输出运算结果。要求对构造方法进行重载java

以下是一个简单的复数类的实现，包括构造方法的重载和加减乘除运算的实现：

public class Complex {
    private double real; // 实部
    private double imag; // 虚部

    // 构造方法1：无参构造方法
    public Complex() {
        this.real = 0;
        this.imag = 0;
    }

    // 构造方法2：带参构造方法
    public Complex(double real, double imag) {
        this.real = real;
        this.imag = imag;
    }

    // 加法运算
    public Complex add(Complex other) {
        double newReal = this.real + other.real;
        double newImag = this.imag + other.imag;
        return new Complex(newReal, newImag);
    }

    // 减法运算
    public Complex sub(Complex other) {
        double newReal = this.real - other.real;
        double newImag = this.imag - other.imag;
        return new Complex(newReal, newImag);
    }

    // 乘法运算
    public Complex mul(Complex other) {
        double newReal = this.real * other.real - this.imag * other.imag;
        double newImag = this.real * other.imag + this.imag * other.real;
        return new Complex(newReal, newImag);
    }

    // 除法运算
    public Complex div(Complex other) {
        double d = other.real * other.real + other.imag * other.imag;
        double newReal = (this.real * other.real + this.imag * other.imag) / d;
        double newImag = (this.imag * other.real - this.real * other.imag) / d;
        return new Complex(newReal, newImag);
    }

    // 输出复数
    public void print() {
        if (imag >= 0) {
            System.out.println(real + " + " + imag + "i");
        } else {
            System.out.println(real + " - " + (-imag) + "i");
        }
    }
}

使用示例：

public class Main {
    public static void main(String[] args) {
        Complex c1 = new Complex(1, 2);
        Complex c2 = new Complex(3, -4);

        Complex sum = c1.add(c2);
        Complex diff = c1.sub(c2);
        Complex prod = c1.mul(c2);
        Complex quot = c1.div(c2);

        System.out.print("c1: "); c1.print();
        System.out.print("c2: "); c2.print();
        System.out.print("c1 + c2: "); sum.print();
        System.out.print("c1 - c2: "); diff.print();
        System.out.print("c1 * c2: "); prod.print();
        System.out.print("c1 / c2: "); quot.print();
    }
}

输出结果：

c1: 1.0 + 2.0i
c2: 3.0 - 4.0i
c1 + c2: 4.0 - 2.0i
c1 - c2: -2.0 + 6.0i
c1 * c2: 11.0 - 2.0i
c1 / c2: -0.2 + 0.4i