level 1
绝情酷哥
楼主
package com.cucu.test;/** * @author http://www.linewell.com [email protected] * @version 1.0 */public class Sort { public void swap(int a[], int i, int j) { int tmp = a[i]; a[i] = a[j]; a[j] = tmp; } public int partition(int a[], int low, int high) { int pivot, p_pos, i; p_pos = low; pivot = a[p_pos]; for (i = low + 1; i <= high; i++) { if (a[i] > pivot) { p_pos++; swap(a, p_pos, i); } } swap(a, low, p_pos); return p_pos; } public void quicksort(int a[], int low, int high) { int pivot; if (low < high) { pivot = partition(a, low, high); quicksort(a, low, pivot - 1); quicksort(a, pivot + 1, high); } } public static void main(String args[]) { int vec[] = new int[] { 37, 47, 23, -5, 19, 56 }; int temp; //选择排序法(Selection Sort) long begin = System.currentTimeMillis(); for (int k = 0; k < 1000000; k++) { for (int i = 0; i < vec.length; i++) { for (int j = i; j < vec.length; j++) { if (vec[j] > vec[i]) { temp = vec[i]; vec[i] = vec[j]; vec[j] = temp; } } } } long end = System.currentTimeMillis(); System.out.println("选择法用时为：" + (end - begin)); //打印排序好的结果 for (int i = 0; i < vec.length; i++) { System.out.println(vec[i]); } // 冒泡排序法(Bubble Sort) begin = System.currentTimeMillis(); for (int k = 0; k < 1000000; k++) { for (int i = 0; i < vec.length; i++) { for (int j = i; j < vec.length - 1; j++) { if (vec[j + 1] > vec[j]) { temp = vec[j + 1]; vec[j + 1] = vec[j]; vec[j] = temp; } } } } end = System.currentTimeMillis(); System.out.println("冒泡法用时为：" + (end - begin)); //打印排序好的结果 for (int i = 0; i < vec.length; i++) { System.out.println(vec[i]); } //插入排序法(Insertion Sort) begin = System.currentTimeMillis(); for (int k = 0; k < 1000000; k++) { for (int i = 1; i < vec.length; i++) { int j = i; while (vec[j - 1] < vec[i]) { vec[j] = vec[j - 1]; j--; if (j <= 0) { break; } } vec[j] = vec[i]; } } end = System.currentTimeMillis(); System.out.println("插入法用时为：" + (end - begin)); //打印排序好的结果 for (int i = 0; i < vec.length; i++) { System.out.println(vec[i]); } //快速排序法(Quick Sort) Sort s = new Sort(); begin = System.currentTimeMillis(); for (int k = 0; k < 1000000; k++) { s.quicksort(vec, 0, 5); } end = System.currentTimeMillis(); System.out.println("快速法用时为：" + (end - begin)); //打印排序好的结果 for (int i = 0; i < vec.length; i++) { System.out.println(vec[i]); } }}以下是运行结果：选择法用时为：2345647372319-5冒泡法用时为：1725647372319-5插入法用时为：785647372319-5快速法用时为：2975647372319-5
2004年11月24日 13点11分
1
