Java常用アルゴリズム挿入、泡立ち、快速ソート大放送

import java.util.Arrays;

/**
 * Created by ykanghe on 12/27/16.
 */
public class algorithm {
    /**
     *     
     *
     * @param a
     * @param left
     * @param right
     * @return
     */
    public static int quickPostSort(int[] a, int left, int right) {
        int low = left;
        int high = right;
        int value = a[low];
        while (low < high) {
            while (low < high && value <= a[high]) {
                high--;
            }
            a[low] = a[high];
            while (low < high && value >= a[low]) {
                low++;
            }
            a[high] = a[low];
        }
        a[low] = value;
        return low;
    }

    public static void quickSort(int[] a, int left, int right) {
        if (left < right) {
            int q = quickPostSort(a, left, right);
            quickSort(a, left, q - 1);
            quickSort(a, q + 1, right);
        }
    }

    /**
     *     
     *
     * @param a
     * @return
     */
    public static void blumSort(int[] a) {
        if (a.length > 0) {
            int tmp = 0;
            for (int i = 0; i < a.length - 1; i++) {
                for (int j = 0; j < a.length - 1 - i; j++) {
                    if (a[j] > a[j + 1]) {
                        tmp = a[j];
                        a[j] = a[j + 1];
                        a[j + 1] = tmp;
                    }
                }
            }
        }
    }

    /**
     *       
     *
     * @param a
     */
    public static void insertSort(int[] a) {
        for (int i = 1; i < a.length; i++) {
            int key = a[i];
            int j = i - 1;
            while (j >= 0 && a[j] > key) {
                a[j + 1] = a[j];
                j--;
            }
            a[j + 1] = key;
        }

    }

    public static void main(String[] arg) {
        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};

//        blumSort(a);//  
//        quickSort(a, 0, a.length - 1);//  
        insertSort(a);//    
        String s = Arrays.toString(a);
        System.out.println(s);
    }

}