课本6.7作业

1.复制数组

int[] arr1 = {14, 7, 12, 22, 30, 9};
        
int[] arr2 = new int[5];

   arr2 = Arrays.copyOfRange(arr1, 0, 4);

        for(int a : arr1)
        {
            System.out.print(a + " ");
        }

        System.out.println();

        for(int b : arr2)
        {
            System.out.print(b + " ");
        }
        

 

2.输出数组中最小的数

        int arr[] = {14, 7, 12, 22, 30, 9};
        for(int a = 1; a < arr.length; a++)
        {
            for(int b = 0; b < arr.length - 1; b++)
            {
                if(arr[b] > arr[b + 1])
                {
                    int h = arr[b + 1];
                    arr[b + 1] = arr[b];
                    arr[b] = h;
                }
            }
        }
        System.out.println(arr[0]);

3.替换数组

        String tr = "bb";
        String  []wow = new String []{"jhg", "kf", "jj", "hg", "rt", "ute"};
        for(int a = 0; a < wow.length; a++)
        {
            System.out.print(wow[a] + " ");
        }
        Arrays.fill(wow, 2, 3, tr);
        
        System.out.println();
        for(int a = 0; a < wow.length; a++)
        {
            System.out.print(wow[a] + " ");
        }

4，二维数组调换顺序输出

        int[][] a = new int[3][3];
        a[0] = new int[]{1, 2, 3};
        a[1] = new int[]{4, 5, 6};
        a[2] = new int[]{7, 8, 9};
        
        for(int x = 0; x < a.length; x++)
        {
            for(int y = 0; y < a.length; y++)
            {
                System.out.print(a[x][y] + " ");
            }
            System.out.println();
        }
        for(int x = 0; x < a.length; x++)
        {
            for(int y = 0; y < a.length; y++)
            {
                System.out.print(a[y][x] + " ");
            }
            System.out.println();