试编写java代码,实现复数求和运算,要求能够满足两个复数数、复数数组的求和运算需求。

下面是一个实现复数求和运算的 Java 代码，包含了两个复数数、复数数组的求和运算方法：

public class ComplexNumber {
    private double real;
    private double imaginary;

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

    public ComplexNumber add(ComplexNumber other) {
        double resultReal = this.real + other.real;
        double resultImaginary = this.imaginary + other.imaginary;
        return new ComplexNumber(resultReal, resultImaginary);
    }

    public static ComplexNumber sum(ComplexNumber[] numbers) {
        double sumReal = 0;
        double sumImaginary = 0;
        for (ComplexNumber number : numbers) {
            sumReal += number.real;
            sumImaginary += number.imaginary;
        }
        return new ComplexNumber(sumReal, sumImaginary);
    }

    public String toString() {
        String sign = this.imaginary < 0 ? "-" : "+";
        return String.format("%.2f %s %.2fi", this.real, sign, Math.abs(this.imaginary));
    }
}

这里定义了一个 `ComplexNumber` 类，表示复数，包含了实部和虚部两个属性，并提供了复数加法的实例方法 `add()` 和复数数组求和的静态方法 `sum()`。在 `toString()` 方法中，定义了复数的字符串表示方式，方便输出结果。

下面是一个示例代码，展示了如何使用这个类进行复数求和运算：

public class Test {
    public static void main(String[] args) {
        ComplexNumber c1 = new ComplexNumber(3, 4);
        ComplexNumber c2 = new ComplexNumber(2, -1);
        ComplexNumber c3 = new ComplexNumber(-1, 2);
        ComplexNumber[] numbers = {c1, c2, c3};
        
        ComplexNumber sum1 = c1.add(c2); // 复数加法
        ComplexNumber sum2 = ComplexNumber.sum(numbers); // 复数数组求和
        
        System.out.println("c1 = " + c1);
        System.out.println("c2 = " + c2);
        System.out.println("c3 = " + c3);
        System.out.println("c1 + c2 = " + sum1);
        System.out.println("sum = " + sum2);
    }
}

运行结果如下：

c1 = 3.00 + 4.00i
c2 = 2.00 - 1.00i
c3 = -1.00 + 2.00i
c1 + c2 = 5.00 + 3.00i
sum = 4.00 + 5.00i