在java中是否有更复杂的冒泡排序算法版本?

时间:2014-02-20 15:23:50

标签: java sorting

我创建了一些使用冒泡排序对数组进行排序的代码,但有人告诉我,冒泡排序的变化表现更好,所以我想知道是否有更好的冒泡排序版本。例如,我正在使用常规版本,如下所示:

package termproject3;

import java.util.Random;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;


public class TermProject3 {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    // TODO code application logic here 
    Scanner sc = new Scanner(System.in);    
    System.out.println("please enter the size of the array:");
    int n = sc.nextInt();
     System.out.println("Enter the  number of iterations: ");
    int num_i = sc.nextInt();
    int swap;
    int array[] = new int[n];

    Random r = new Random();
    long startTime = System.nanoTime();
    for (int t = 0; t < num_i; t++){
     System.out.println();   
    System.out.println( t+1 + ".- Array to be sorted: ");

    for (int i = 0; i < n; i++) {
        array[i] = r.nextInt(array.length);

        System.out.print(array[i] + ", ");
    }

    System.out.println();

    for (int i = 0; i < (n - 1); i++) {
        for (int d = 0; d < n - i - 1; d++) {
            if (array[d] > array[d + 1]) {
                swap = array[d];
                array[d] = array[d + 1];
                array[d + 1] = swap;
            }
        }
    }

    System.out.println("Sorted list using bubble sort :");

    for (int i = 0; i < n; i++) {
        System.out.print(array[i] + ", ");
    }
    System.out.println();

}
 long running_time = System.nanoTime() - startTime;

System.out.println("elapsed time: " +running_time+ " nano seconds"); 

System.out.println("which is " + running_time/1E9 + " seconds");
}
}

2 个答案:

答案 0 :(得分:4)

我不知道你为什么要使用冒泡排序,但是Collections.sort(List)Collections.sort(List, Comparator)实现了你可以使用的快速排序。

答案 1 :(得分:0)

这个答案可能对您有所帮助: Optimized Bubble Sort (Java)

值得注意的是,优化冒泡排序是一项愚蠢的练习,因为存在更快,更优雅的方法:

Collections.sort(List)