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（3）用java实现 [backcolor=rgb(27, 36, 38) !important][size=1em][backcolor=rgb(67, 90, 95) !important][size=1em]?
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| [size=1em][size=1em]public class quickSort {
[size=1em] int a[]={49,38,65,97,76,13,27,49,78,34,12,64,5,4,62,99,98,54,56,17,18,23,34,15,35,25,53,51};
[size=1em]public quickSort(){
[size=1em] quick(a);
[size=1em] for(int i=0;i<a.length;i++)
[size=1em] System.out.println(a );
[size=1em]}
[size=1em]public int getMiddle(int[] list, int low, int high) {
[size=1em] int tmp = list[low]; //数组的第一个作为中轴
[size=1em] while (low < high) {
[size=1em] while (low < high && list[high] >= tmp) {
[size=1em] high--;
[size=1em] }
[size=1em] list[low] = list[high]; //比中轴小的记录移到低端
[size=1em] while (low < high && list[low] <= tmp) {
[size=1em] low++;
[size=1em] }
[size=1em] list[high] = list[low]; //比中轴大的记录移到高端
[size=1em] }
[size=1em] list[low] = tmp; //中轴记录到尾
[size=1em] return low; //返回中轴的位置
[size=1em] }
[size=1em]public void _quickSort(int[] list, int low, int high) {
[size=1em] if (low < high) {
[size=1em] int middle = getMiddle(list, low, high); //将list数组进行一分为二
[size=1em] _quickSort(list, low, middle - 1); //对低字表进行递归排序
[size=1em] _quickSort(list, middle + 1, high); //对高字表进行递归排序
[size=1em] }
[size=1em] }
[size=1em]public void quick(int[] a2) {
[size=1em] if (a2.length > 0) { //查看数组是否为空
[size=1em] _quickSort(a2, 0, a2.length - 1);
[size=1em] }
[size=1em] }
[size=1em]}
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7、归并排序 （1）基本排序：归并（Merge）排序法是将两个（或两个以上）有序表合并成一个新的有序表，即把待排序序列分为若干个子序列，每个子序列是有序的。然后再把有序子序列合并为整体有序序列。 （2）实例： ![]()
（3）用java实现
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| [size=1em][size=1em]import java.util.Arrays;
[size=1em]public class mergingSort {
[size=1em]int a[]={49,38,65,97,76,13,27,49,78,34,12,64,5,4,62,99,98,54,56,17,18,23,34,15,35,25,53,51};
[size=1em]public mergingSort(){
[size=1em] sort(a,0,a.length-1);
[size=1em] for(int i=0;i<a.length;i++)
[size=1em] System.out.println(a );
[size=1em]}
[size=1em]public void sort(int[] data, int left, int right) {
[size=1em] // TODO Auto-generated method stub
[size=1em] if(left<right){
[size=1em] //找出中间索引
[size=1em] int center=(left+right)/2;
[size=1em] //对左边数组进行递归
[size=1em] sort(data,left,center);
[size=1em] //对右边数组进行递归
[size=1em] sort(data,center+1,right);
[size=1em] //合并
[size=1em] merge(data,left,center,right);
[size=1em]
[size=1em] }
[size=1em]}
[size=1em]public void merge(int[] data, int left, int center, int right) {
[size=1em] // TODO Auto-generated method stub
[size=1em] int [] tmpArr=new int[data.length];
[size=1em] int mid=center+1;
[size=1em] //third记录中间数组的索引
[size=1em] int third=left;
[size=1em] int tmp=left;
[size=1em] while(left<=center&&mid<=right){
[size=1em] //从两个数组中取出最小的放入中间数组
[size=1em] if(data[left]<=data[mid]){
[size=1em] tmpArr[third++]=data[left++];
[size=1em] }else{
[size=1em] tmpArr[third++]=data[mid++];
[size=1em] }
[size=1em] }
[size=1em] //剩余部分依次放入中间数组
[size=1em] while(mid<=right){
[size=1em] tmpArr[third++]=data[mid++];
[size=1em] }
[size=1em] while(left<=center){
[size=1em] tmpArr[third++]=data[left++];
[size=1em] }
[size=1em] //将中间数组中的内容复制回原数组
[size=1em] while(tmp<=right){
[size=1em] data[tmp]=tmpArr[tmp++];
[size=1em] }
[size=1em] System.out.println(Arrays.toString(data));
[size=1em]}
[size=1em]}
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