如何在java中返回二维数组方法的平均分？

public static double calculateAverage(int[][] array) {
    // 在这里计算平均分并返回
}

public static double calculateAverage(int[][] array) {
    int sum = 0;
    int count = 0;
    
    for (int i = 0; i < array.length; i++) {
        for (int j = 0; j < array[i].length; j++) {
            sum += array[i][j];
            count++;
        }
    }
    
    // 在这里计算平均分并返回
}

public static double calculateAverage(int[][] array) {
    int sum = 0;
    int count = 0;
    
    for (int i = 0; i < array.length; i++) {
        for (int j = 0; j < array[i].length; j++) {
            sum += array[i][j];
            count++;
        }
    }
    
    double average = (double) sum / count;
    return average;
}

public static void main(String[] args) {
    int[][] array = {{80, 90, 70}, {75, 85, 95}, {60, 70, 80}};
    double average = calculateAverage(array);
    
    System.out.println("平均分：" + average);
}