将long []数组转换为int

Question

每个人！我刚刚开始对Java感兴趣，并且无法将数组类型的结果长时间转换为int类型。如果我懂写的话，在这里我仍然会得到int类型的结果:(你能给我一些建议吗？谢谢！

public class Main {
    public static void main(String[] args) {
        long[] numbers;
        numbers = sorting(new long[]{5, 21, 19, 55, 94, 73, 69, 100,});



    }

    public static long[] sorting(long [] numbers) {

        for (long num : numbers) {
            long j = 0;
            for (int i = 0; i < numbers.length - 1; i++) {
                if (numbers[i] > numbers[i + 1]) {
                    j = numbers[i];
                    numbers[i] = numbers[i + 1];
                    numbers[i + 1] = j;


                }
            }
            System.out.println(num + ",");
        }
        return (numbers); 

Answer 1

[将long []转换为int []，您需要遍历long []数组，将每个数字转换为int并将其放入int []数组。

// Your result
long[] numbers = sorting(new long[] {5, 21, 19, 55, 94, 73, 69, 100});

// Define a new int array with the same length of your result array
int[] intNumbers = new int[numbers.length];

// Loop through all the result numbers
for(int i = 0; i < numbers.length; i++)
{
    // Cast to int and put it to the int array
    intNumbers[i] = (int) numbers[i];
}

或者您也可以将Java Streams（> = 1.8）用于较短的版本：

int[] intArray = Arrays.stream(numbers).mapToInt(i -> (int) i).toArray();

Answer 2

[convert-an-int-array-to-long-array-using-java-8

您可以尝试以下方法：

    long[] longArray = {1, 2, 3};
    int[] intArray = Arrays.stream(longArray).mapToInt(i -> (int) i).toArray();