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

 1         int arr[] = {14, 7, 12, 22, 30, 9};
 2         for(int a = 1; a < arr.length; a++)
 3         {
 4             for(int b = 0; b < arr.length - 1; b++)
 5             {
 6                 if(arr[b] > arr[b + 1])
 7                 {
 8                     int h = arr[b + 1];
 9                     arr[b + 1] = arr[b];
10                     arr[b] = h;
11                 }
12             }
13         }
14         System.out.println(arr[0]);

3.替换数组

 1         String tr = "bb";
 2         String  []wow = new String []{"jhg", "kf", "jj", "hg", "rt", "ute"};
 3         for(int a = 0; a < wow.length; a++)
 4         {
 5             System.out.print(wow[a] + " ");
 6         }
 7         Arrays.fill(wow, 2, 3, tr);
 8         
 9         System.out.println();
10         for(int a = 0; a < wow.length; a++)
11         {
12             System.out.print(wow[a] + " ");
13         }

4，二维数组调换顺序输出

 1         int[][] a = new int[3][3];
 2         a[0] = new int[]{1, 2, 3};
 3         a[1] = new int[]{4, 5, 6};
 4         a[2] = new int[]{7, 8, 9};
 5         
 6         for(int x = 0; x < a.length; x++)
 7         {
 8             for(int y = 0; y < a.length; y++)
 9             {
10                 System.out.print(a[x][y] + " ");
11             }
12             System.out.println();
13         }
14         for(int x = 0; x < a.length; x++)
15         {
16             for(int y = 0; y < a.length; y++)
17             {
18                 System.out.print(a[y][x] + " ");
19             }
20             System.out.println();