使用for循环将一个数组分配给另一个数组

Question

I have a project where by I used a sorting algorithm to sort an array but I am at the point where I now need to examine different arrays of different sizes and different values. Is there a way I can assign an array to a global array using a for loop eg I have 12 arrays named array1 through to array12 and i need to assign them to a global array called array that is passed in to the sorting algorithm The 12 arrays are passed in to the array from a file

Answer 1

Having variables that look like array1 , array2 , array3 ,..., array12 is a sure sign that you need a single array instead of all these variables. You should put these arrays into an array of arrays, and use array[x] to access them.

For example, instead of

int[] array1 = new int[] {1, 2, 3};
int[] array2 = new int[] {4, 5, 6};
...
int[] array12 = new int[] {34, 35, 36};

you would write

int[][] array = new int[][] {
    new int[] {1, 2, 3},
    new int[] {4, 5, 6},
    ...
    new int[] {34, 35, 36}
};

Now instead of writing array5 you would write array[4] (4, not 5, because indexes of Java arrays are zero-based). This indexing can be done with a for loop:

int[][] array = new int[][] { ... };
for (int i = 0 ; i != array.length ; i++) {
    callMySort(array[i]);
}

or from a foreach loop:

int[][] array = new int[][] { ... };
for (int[] sortMe : array) {
    callMySort(sortMe);
}