帮我用java写一个归并排序的程序,初始数组为[10,5,8,2,1]
时间: 2023-04-03 15:04:49 浏览: 52
好的,以下是归并排序的Java程序:
```
public class MergeSort {
public static void main(String[] args) {
int[] arr = {10, 5, 8, 2, 1};
mergeSort(arr, 0, arr.length - 1);
for (int i : arr) {
System.out.print(i + " ");
}
}
public static void mergeSort(int[] arr, int left, int right) {
if (left < right) {
int mid = (left + right) / 2;
mergeSort(arr, left, mid);
mergeSort(arr, mid + 1, right);
merge(arr, left, mid, right);
}
}
public static void merge(int[] arr, int left, int mid, int right) {
int[] temp = new int[right - left + 1];
int i = left;
int j = mid + 1;
int k = 0;
while (i <= mid && j <= right) {
if (arr[i] < arr[j]) {
temp[k++] = arr[i++];
} else {
temp[k++] = arr[j++];
}
}
while (i <= mid) {
temp[k++] = arr[i++];
}
while (j <= right) {
temp[k++] = arr[j++];
}
for (int p = 0; p < temp.length; p++) {
arr[left + p] = temp[p];
}
}
}
```
这个程序可以对初始数组[10,5,8,2,1]进行归并排序。
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