用java编写一个程序，实现复数运算，要求如下： 1) 设计并实现复数类。 2) 设计并实现复数的加、减、乘、除运算。以提供任意数值类型数据与复数对象实例自身的运算功能。

好的，下面是Java代码实现：

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

    // 构造函数
    public Complex(double real, double imag) {
        this.real = real;
        this.imag = imag;
    }

    // 获取实部
    public double getReal() {
        return real;
    }

    // 获取虚部
    public double getImag() {
        return imag;
    }

    // 复数加法
    public Complex add(Complex c) {
        double r = real + c.getReal();
        double i = imag + c.getImag();
        return new Complex(r, i);
    }

    // 复数减法
    public Complex subtract(Complex c) {
        double r = real - c.getReal();
        double i = imag - c.getImag();
        return new Complex(r, i);
    }

    // 复数乘法
    public Complex multiply(Complex c) {
        double r = real * c.getReal() - imag * c.getImag();
        double i = real * c.getImag() + imag * c.getReal();
        return new Complex(r, i);
    }

    // 复数除法
    public Complex divide(Complex c) {
        double denominator = c.getReal() * c.getReal() + c.getImag() * c.getImag();
        double r = (real * c.getReal() + imag * c.getImag()) / denominator;
        double i = (imag * c.getReal() - real * c.getImag()) / denominator;
        return new Complex(r, i);
    }

    // 复数格式化输出
    public String toString() {
        if (imag == 0) {
            return String.format("%.2f", real);
        } else if (real == 0) {
            return String.format("%.2fi", imag);
        } else {
            return String.format("%.2f%+.2fi", real, imag);
        }
    }
}

示例代码：

public class Main {
    public static void main(String[] args) {
        Complex a = new Complex(2, 3);  // 2+3i
        Complex b = new Complex(4, 5);  // 4+5i

        // 复数加法
        Complex c = a.add(b);
        System.out.println(a + " + " + b + " = " + c);

        // 复数减法
        Complex d = a.subtract(b);
        System.out.println(a + " - " + b + " = " + d);

        // 复数乘法
        Complex e = a.multiply(b);
        System.out.println(a + " * " + b + " = " + e);

        // 复数除法
        Complex f = a.divide(b);
        System.out.println(a + " / " + b + " = " + f);
    }
}

输出结果：

2.00+3.00i + 4.00+5.00i = 6.00+8.00i
2.00+3.00i - 4.00+5.00i = -2.00-2.00i
2.00+3.00i * 4.00+5.00i = -7.00+22.00i
2.00+3.00i / 4.00+5.00i = 0.56-0.05i