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在Java中,可以使用for循环、while循环或者数学库函数(如Math.sum())来求和。以下是几种不同的方法:
- 使用for循环:
public class Sum { public static void main(String[] args) { int n = 10; int sum = 0; for (int i = 1; i <= n; i++) { sum += i; } System.out.println("1到" + n + "的和为:" + sum); } }
- 使用while循环:
public class Sum { public static void main(String[] args) { int n = 10; int sum = 0; int i = 1; while (i <= n) { sum += i; i++; } System.out.println("1到" + n + "的和为:" + sum); } }
- 使用Java 8的Stream API:
import java.util.stream.IntStream; public class Sum { public static void main(String[] args) { int n = 10; int sum = IntStream.rangeClosed(1, n).sum(); System.out.println("1到" + n + "的和为:" + sum); } }
- 使用Math.sum()函数(仅适用于整数数组):
public class Sum { public static void main(String[] args) { int[] numbers = {1, 2, 3, 4, 5}; int sum = 0; for (int number : numbers) { sum += number; } System.out.println("数组元素的和为:" + sum); } }