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快速排序算法(Java)

快速排序算法的基本思想是:通过一趟排序将待排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外一部分记录的关键字小,则可分别对这两部分记录继续进行排序,以达到整个序列有序。

class PartitionSort{    public void p(int[] a){               //打印输出结果        for(int i=0;i<a.length;i++){            System.out.print(a[i]+" ");        }        System.out.println();    }    public int Partition(int[] a,int low,int high){        //找出中间位置的序号,并返回        int temp = a[low];       //set the low number is middle number        while(low<high){             while(low<high&&temp<=a[high]){ //this is can not lost =,else is die loop                high--;                    //high position - 1             }            a[low]=a[high];               //< middle number ,make it in front of middle number             while(low<high&&temp>a[low]){                 low++;            }            a[high]=a[low];        }        a[low] = temp;        return low;    }    public void QSort(int[] a,int low,int high){ //recurrence method to come true  使用递归方法进行排序        if(a.length>0){            if(low<high){                int partition = Partition(a,low,high);                QSort(a,low,partition-1);                QSort(a,partition+1,high);            }        }    }    public static void main(String args[]){        int[] a = {38,49,65,97,76,13,27,49};        PartitionSort P = new PartitionSort();        P.QSort(a,0,a.length-1);        P.p(a);    }}

 

快速排序算法(Java)