Java计算1-100的和(要求尽量考虑代码优化)

1.递归算法

     public static void main(String[] args) {
         System.out.println(add(1));
     }

     private static int add(int i) {
         if (i < 100 && i > 0) {
             return i + add(i + 1);
         }
         else {
             return i;
         }
     }

2..for循环

     public static void main(String[] args) {
         int sum = 0;
         for (int i = 1; i <= 100; i++) {
             sum += i;
         }
         System.out.println("1到100累加的和为：" + sum);
     }

3.while循环

     public static void main(String[] args) {
         int sum = 0;
         int i = 1;
         while (i <= 100) {
             sum += i;
             i++;
         }
         System.out.println("1到100累加的和为：" + sum);
     }

4.do.....while循环

     public static void main(String[] args) {
         int sum = 0;
         int i = 1;
         do {
             sum += i;
             i++;
         } while (i <= 100);
         System.out.println("1到100累加的和为：" + sum);
     }