1.实现

        int[] arr = new int[10];
        //赋值
        for (int i = 0; i < arr.length; i++) {
            arr[i] = (int)(Math.random()*90+10);
            System.out.print(arr[i]+"\t");
        }
        
        int maxValue = arr[0];
        int minValue = arr[0];
        int sum = 0;
        double avg = 0;
        
        for (int i = 0; i < arr.length; i++) {
            sum+=arr[i];
            if (maxValue<arr[i]){
                maxValue = arr[i];
            }
            if (minValue>arr[i]){
                minValue = arr[i];
            }
        }
        avg = sum*1.00/arr.length;
        System.out.println("最大值"+maxValue);
        System.out.println("最小值："+minValue);
        System.out.println("和为："+sum);
        System.out.println("平均："+avg);