使用java语言写一个累加函数

public class Accumulator { private int sum;

public Accumulator() {
    sum = 0;
}

public void add(int num) {
    sum += num;
}

public int getSum() {
    return sum;
}

public static void main(String[] args) {
    Accumulator accumulator = new Accumulator();
    accumulator.add(1);
    accumulator.add(2);
    accumulator.add(3);
    System.out.println(accumulator.getSum());  // 打印出 6
}

}