用Java写一个快速排序的代码
时间: 2024-05-27 20:14:15 浏览: 14
public class QuickSort {
public static void main(String[] args) {
int[] arr = { 3, 6, 1, 8, 4, 9, 2, 7, 5 };
System.out.println("Before sorting:");
displayArray(arr);
quickSort(arr, 0, arr.length - 1);
System.out.println("After sorting:");
displayArray(arr);
}
public static void quickSort(int[] arr, int low, int high) {
if (low < high) {
int pivotIndex = partition(arr, low, high);
quickSort(arr, low, pivotIndex - 1);
quickSort(arr, pivotIndex + 1, high);
}
}
public static int partition(int[] arr, int low, int high) {
int pivotIndex = (low + high) / 2;
int pivotValue = arr[pivotIndex];
swap(arr, pivotIndex, high);
int storeIndex = low;
for (int i = low; i < high; i++) {
if (arr[i] < pivotValue) {
swap(arr, i, storeIndex);
storeIndex++;
}
}
swap(arr, storeIndex, high);
return storeIndex;
}
public static void swap(int[] arr, int i, int j) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
public static void displayArray(int[] arr) {
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i] + " ");
}
System.out.println();
}
}
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