java中双精度的选择排序

问题是您还使用了double来索引数组.所以试试这个:

public static void selectionSort (double...arr)
{
    int i = 0, j = 0, smallest = 0;
    double temp = 0.0;

    for (i = 0; i < arr.length - 1; i++)
    {
        smallest = i;
        for (j = 1; j < arr.length - 1; j++)
        {
            if (arr[j] < arr[smallest])
                smallest = j;
        }
        temp = arr[smallest];
        arr[smallest] = arr[i];
        arr[i] = temp;
    }
}

正如您所看到的,仍然有双精度作为参数,temp-value和arr-array也仍然是双精度数,但用于数组的索引是整数.

索引总是int.例如,当我们有一个字符串数组时,我们仍然使用int作为索引:

String[] sArray = {
    "word1",
    "word2",
    "word3"
}
int index = 1;
String result = sArray[index]; // As you can see we use an int as index, and the result is a String
// In your case, the index is still an int, but the result is a double