数组

数组定义和基本使用

  public static void main(String[] args) {
        int[] nums; //1.声名一个数组

        nums = new int[10];//创建一个数组

        //int[] nums = new int[10];   效果等于上面2句

        //3.给数组赋值
        nums[0] = 1;
        nums[1] = 2;
        nums[2] = 3;
        nums[3] = 4;
        nums[4] = 5;
        nums[5] = 6;
        nums[6] = 7;
        nums[7] = 8;
        nums[8] = 9;
        nums[9] = 10;

        System.out.println(nums[0]);


        System.out.println("---------------------------------------------------------------");

        //静态初始化:创建＋赋值int[]
        int[] a = {1, 2, 3, 4, 5, 6, 7, 8};
        System.out.println(a[0]);
        // /动态初始化 :包含默认初始化
        int[] b = new int[10];
        b[0] = 10;
        b[1] = 10;
        System.out.println(b[0]);
        System.out.println(b[1]);
        System.out.println(b[2]);
        System.out.println(b[3]);
        System.out.println("---------------------------------------------------------------");

        //寻找最大的元素
        int max = a[0];
        for (int i = 1; i < a.length; i++) {
            if (max < a[i]) {
                max = a[i];
            }
        }
        System.out.println("最大" + max);

        //计算数组元素和
        int sum = 0;
        //获取数组长度，array.length
        for (int i = 0; i < nums.length; i++) {
            sum = sum + nums[i];
        }
        System.out.println("总和：" + sum);


        //遍历
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
    }

数组的基本使用

                            //数组的基本使用
    public static void main(String[] args) {
        int[] arrays = {1, 2, 3, 4, 5, 6,};
//        //JDK1.5,没有下标  方便遍历打印
//        for (int array : arrays) {
//            System.out.println(array);
//        }
        printArray(arrays);
        System.out.println();

        int[] reverse = reverse(arrays);
        printArray(reverse);
        System.out.println("===========================================");
    }
    

    //打印数组元素
    public static void printArray(int[] Array) {
        for (int i = 0; i < Array.length; i++) {
            System.out.print(Array[i] + " ");
        }
    }

    //反转数组元素
    public static int[] reverse(int[] arrays) {
        int[] result = new int[arrays.length];
        for (int i = 0, j = result.length-1; i < result.length; i++, j--) {
            result[j]=arrays[i];
        }
        return result;
    }