class Complex { int real1; int image1; int real2; int image2; public String add() { int realSum = real1 + real2; int imageSum = image1 + image2; if (realSum == 0 && imageSum == 0) { return "零"; } else if (realSum == 0) { return imageSum + "i"; } else if (imageSum == 0) { return String.valueOf(realSum); } else { return realSum + "+" + imageSum + "i"; } }
}