Java算法：求和与平均值实现教程

int[] numbers = {1, 2, 3, 4, 5};
int sum = 0;
for (int num : numbers) {
    sum += num;
}
System.out.println("总和是：" + sum); // 输出：15

int[] numbers = {1, 2, 3, 4, 5};
int sum = 0;
for (int num : numbers) {
    sum += num;
}
double average = (double) sum / numbers.length;
System.out.println("平均值是：" + average); // 输出：3.0

public static int calculateSum(int[] arr) {
    int sum = 0;
    for (int value : arr) {
        sum += value;
    }
    return sum;
}

public static double calculateAverage(int[] arr) {
    if (arr.length == 0) return 0.0;
    return (double) calculateSum(arr) / arr.length;
}

int[] data = {10, 20, 30};
System.out.println("和：" + calculateSum(data));      // 60
System.out.println("平均值：" + calculateAverage(data)); // 20.0

int[] numbers = {1, 2, 3, 4, 5};
int sum = Arrays.stream(numbers).sum();
double average = Arrays.stream(numbers).average().orElse(0.0);