import java.util.Arrays; /** * This program demonstrates bubble sort. 冒泡排序的实现方式及优化,个人练习,如有错误请大侠指出 */ public class BubbleSortImpro { public static void main(String[] args) { int[] a = { 3, 5, 10, 4, 1 }; bubbleSort1(a); System.out.println("The 1 result: " + Arrays.toString(a)); int[] b = { 3, 5, 10, 4, 1 }; bubbleSort2(b); System.out.println("The 2 result: " + Arrays.toString(b)); int[] c = { 3, 5, 10, 4, 1 }; bubbleSort3(c); System.out.println("The 3 result: " + Arrays.toString(c)); } // 第一种实现:(前两种实现都是稳定排序) private static void bubbleSort1(int[] arr) { for (int i = 0; i < arr.length - 1; i++) for (int j = 0; j < arr.length - 1 - i; j++) { if (arr[j] > arr[j + 1]) { int temp = 0; temp = arr[j]; arr[j] = arr[j + 1]; arr[j + 1] = temp; } } } // 第二种实现: private static void bubbleSort2(int[] arr) { for (int i = arr.length - 1; i > 0; --i) for (int j = 0; j < i; ++j) { if (arr[j] > arr[j + 1]) { int temp = 0; temp = arr[j]; arr[j] = arr[j + 1]; arr[j + 1] = temp; } } } // 第三种实现;省略了中间的多次交换,这种实现使冒泡排序变成了不稳定排序(参考来的....) private static void bubbleSort3(int[] arr) { for (int i = arr.length - 1, max = 0; i > 0; max = 0, --i) { for (int j = 1; j < i; ++j) { if (arr[j] > arr[max]) max = j; } if (arr[max] > arr[i]) { int temp = 0; temp = arr[max]; arr[max] = arr[i]; arr[i] = temp; } } } }
Java初学者