定义类并编写字符界面的Java Application程序，输入两个复数的实部和虚部，输出两个复数的和、差、积、商。

在Java中，你可以创建一个`ComplexNumber`类来表示复数，并提供相关的操作方法，如加法、减法、乘法和除法。以下是一个简单的示例：

import java.util.Scanner;

class ComplexNumber {
    double real;
    double imaginary;

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

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

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

    // 积
    public ComplexNumber multiply(ComplexNumber other) {
        double realProduct = this.real * other.real - this.imaginary * other.imaginary;
        double imagProduct = this.real * other.imaginary + this.imaginary * other.real;
        return new ComplexNumber(realProduct, imagProduct);
    }

    // 商，需要检查除数是否为0
    public ComplexNumber divide(ComplexNumber other) throws ArithmeticException {
        if (other.real == 0 && other.imaginary == 0) throw new ArithmeticException("Cannot divide by zero");
        double denominator = Math.pow(other.real, 2) + Math.pow(other.imaginary, 2);
        return new ComplexNumber((this.real * other.real + this.imaginary * other.imaginary) / denominator,
                (this.imaginary * other.real - this.real * other.imaginary) / denominator);
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter the first complex number (real and imaginary parts):");
        double real1 = scanner.nextDouble();
        double imag1 = scanner.nextDouble();
        ComplexNumber num1 = new ComplexNumber(real1, imag1);

        System.out.println("Enter the second complex number (real and imaginary parts):");
        double real2 = scanner.nextDouble();
        double imag2 = scanner.nextDouble();
        ComplexNumber num2 = new ComplexNumber(real2, imag2);

        ComplexNumber sum = num1.add(num2);
        ComplexNumber difference = num1.subtract(num2);
        ComplexNumber product = num1.multiply(num2);
        try {
            ComplexNumber quotient = num1.divide(num2);
            System.out.println("Sum: " + sum);
            System.out.println("Difference: " + difference);
            System.out.println("Product: " + product);
            System.out.println("Quotient: " + quotient);
        } catch (ArithmeticException e) {
            System.out.println(e.getMessage());
        }

        scanner.close();
    }
}

当你运行这个程序时，它会提示用户输入两个复数的实部和虚部，然后计算并显示它们的和、差、积以及商（如果除数不为零）。如果你尝试除以零，程序会捕获`ArithmeticException`并给出相应的错误消息。