java - 如何用不同大小的另一个数组填充一个数组？

Question

我有一个第一个 int 数组:

int[] firstarray = {53,45,20,82};
int lengthwanted = 9;
int[] fillarraywith = {15,20};

输出应该是:

finalArray = {53,45,20,82,15,20,15,20,15}

因此，根据输入长度，我用 fillarraywith 的值填充第一个数组。

Answer 1

将另一个数组复制到原始数组的主要工作可以简单地通过 for 循环完成:

public static int[] fillArrayWithAnother(int[] original, int targetLength, int[] arrayToAppend) {
    // don't forget to handle this case!
    if (targetLength <= original.length) {
        return Arrays.copyOfRange(original, 0, targetLength);
    }

    // this is the new array that we are going to fill
    int[] newArray = new int[targetLength];

    // first fill it with the elements in the original array first
    System.arraycopy(original, 0, newArray, 0, original.length);

    // then starting from where we left off, start the for loop
    for (int i = original.length ; i < targetLength ; i++) {
        // Note the use of the mod operator "%" to create the "cycle" of values
        newArray[i] = arrayToAppend[(i - original.length) % arrayToAppend.length];
    }
    return newArray;
}