基本排序算法——快速排序java实现

简单的快速排序算法，我竟然花费了如此多的时间来写作，好好学习。

 1 /**
 2  * 
 3  */
 4 package basic.sort;
 5 
 6 import java.util.Arrays;
 7 import java.util.Random;
 8 
 9 public class QuickSort {
10 
11     
12     public static <AnyType extends Comparable<? super AnyType>>
13     void quickSort(AnyType[] arr){
14         if(arr == null || arr.length ==0){
15             return ;
16         }
17         AnyType key = arr[0];
18         int low = 0,high =arr.length -1;
19         while(low < high){
20             while(arr[high].compareTo(key) > 0 && high > 0){
21                 --high ;
22             }
23             while(arr[low].compareTo(key) <= 0 && low < arr.length-1){
24                 ++low;
25             }
26             if(low < high){
27                 AnyType tmp = arr[low];
28                 arr[low] = arr[high];
29                 arr[high] = tmp;
30             }
31         }
32         arr[0] = arr[high];
33         arr[high] = key;
34         
35         //println(Arrays.toString(arr));
36         
37         quickSort(arr, 0 ,high-1);
38         quickSort(arr,high+1,arr.length-1);
39     }
40     
41     public static <AnyType extends Comparable<? super AnyType>>
42     void quickSort(AnyType[] arr, int l,int h){
43         if(arr == null || arr.length ==0
44                 || l >= h){
45             return ;
46         }
47         AnyType key = arr[l];
48         int low = l+1; 
49         int high = h;
50         
51         while(low < high){
52             while(arr[high].compareTo(key) > 0 && high > l ){
53                 --high ;
54             }
55             while(arr[low].compareTo(key) < 0 && low < h){
56                 ++low;
57             }
58             if(low < high){
59                 AnyType tmp = arr[low];
60                 arr[low] = arr[high];
61                 arr[high] = tmp;
62             }
63         }
64         arr[l] = arr[high];
65         arr[high] = key;
66         
67         quickSort(arr, l ,high-1);
68         quickSort(arr,high+1,h);
69     }
70     
71     
72     
73     public static void main(String[] args) {
74         Random rand = new Random();
75         Integer[] arr = new Integer[10];
76         for(int i = 0 ;i <10 ;i++){
77             arr[i] = rand.nextInt(1000);
78         }
79         println(Arrays.toString(arr));
80         quickSort(arr);
81         println(Arrays.toString(arr));
82     }
83     
84     public static void println(String str){
85         System.out.println(str);        
86     }
87 
88 }

认真努力