2、设计一个复数类，实现两个复数的加减乘除运算，判断两个复数的值是否相等。Java

好的，这是一个复数类的示例代码，实现了加减乘除运算和判断两个复数是否相等的功能：

public class ComplexNumber {
    private double real; // 复数的实部
    private double imaginary; // 复数的虚部

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

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

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

    // 乘法
    public ComplexNumber multiply(ComplexNumber other) {
        double newReal = real * other.real - imaginary * other.imaginary;
        double newImaginary = real * other.imaginary + imaginary * other.real;
        return new ComplexNumber(newReal, newImaginary);
    }

    // 除法
    public ComplexNumber divide(ComplexNumber other) {
        double denominator = other.real * other.real + other.imaginary * other.imaginary;
        double newReal = (real * other.real + imaginary * other.imaginary) / denominator;
        double newImaginary = (imaginary * other.real - real * other.imaginary) / denominator;
        return new ComplexNumber(newReal, newImaginary);
    }

    // 判断是否相等
    public boolean equals(ComplexNumber other) {
        return real == other.real && imaginary == other.imaginary;
    }

    // toString方法，方便输出
    public String toString() {
        return real + " + " + imaginary + "i";
    }
}

使用示例：

ComplexNumber a = new ComplexNumber(1, 2);
ComplexNumber b = new ComplexNumber(3, 4);

ComplexNumber c = a.add(b);
System.out.println(c); // 输出 4.0 + 6.0i

ComplexNumber d = a.subtract(b);
System.out.println(d); // 输出 -2.0 - 2.0i

ComplexNumber e = a.multiply(b);
System.out.println(e); // 输出 -5.0 + 10.0i

ComplexNumber f = a.divide(b);
System.out.println(f); // 输出 0.44 + 0.08i

System.out.println(a.equals(b)); // 输出 false