package com.atguigu.array.sort;
/**
* 快速排序
* 通过一趟排序将待排序记录分割成独立的两部分,其中一部分记录的关键字均比另一部分关键字小,
* 则分别对这两部分继续进行排序,直到整个序列有序。
* @author shkstart
* 2018-12-17
*/
public class QuickSort {
private static void swap(int[] data, int i, int j) {
int temp = data[i];
data[i] = data[j];
data[j] = temp;
}
private static void subSort(int[] data, int start, int end) {
if (start < end) {
int base = data[start];
int low = start;
int high = end + 1;
while (true) {
while (low < end && data[++low] - base <= 0)
;
while (high > start && data[--high] - base >= 0)
;
if (low < high) {
swap(data, low, high);
} else {
break;
}
}
swap(data, start, high);
subSort(data, start, high - 1);//递归调用
subSort(data, high + 1, end);
}
}
public static void quickSort(int[] data){
subSort(data,0,data.length-1);
}
public static void main(String[] args) {
int[] data = { 9, -16, 30, 23, -30, -49, 25, 21, 30 };
System.out.println("排序之前:\n" + java.util.Arrays.toString(data));
quickSort(data);
System.out.println("排序之后:\n" + java.util.Arrays.toString(data));
}
}
原文地址:https://www.cnblogs.com/helloworld0903/p/11456838.html