源代码

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

    public adt(double real, double imag) {
        this.real = real;
        this.imag = imag;
    }

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

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

    // 乘法
    public adt multiply(adt other) {
        double newReal = this.real * other.real - this.imag * other.imag;
        double newImag = this.real * other.imag + this.imag * other.real;
        return new adt(newReal, newImag);
    }

    public double getReal() {
        return real;
    }

    public double getImag() {
        return imag;
    }

    @Override
    public String toString() {
        if (imag == 0) {
            return String.valueOf(real);
        } else if (real == 0) {
            return imag + "i";
        } else {
            return real + (imag > 0 ? " + " : " - ") + Math.abs(imag) + "i";
        }
    }

    // 测试
    public static void main(String[] args) {
        adt c1 = new adt(2, 3);
        adt c2 = new adt(4, 5);

        System.out.println("c1 = " + c1);
        System.out.println("c2 = " + c2);

        adt sum = c1.add(c2);
        System.out.println("c1 + c2 = " + sum);

        adt diff = c1.subtract(c2);
        System.out.println("c1 - c2 = " + diff);

        adt product = c1.multiply(c2);
        System.out.println("c1 * c2 = " + product);
    }
}

运行结果