时间测量插入＆amp;归并排序

Question

我有一个问题，我无法自己解决，因为我无法找到问题，我不知道在哪里看。 我期待测量我的合并和插入算法。我很确定我的算法没问题，它们可以作为应用程序，但是关闭的东西是测量时间的值。所有测试的值都几乎相同，值以E14结束？ 从纳秒时间到秒或毫秒转换我做错了吗？ 看一看。

我的结果显示如下：

Merge Sort integer 
Before:[97, 25, 91, 95, 60, 55, 59, 73, 75, 80]
After: [25, 55, 59, 60, 73, 75, 80, 91, 95, 97]
Measured time: 3.213631365062379E14 seconds


import java.util.Arrays;
import java.util.Random;

import jv222dp_assign3.SortingAlgorithms;

public class AlgorithmMeasure {

    private static int intSize = 10;
    private static int[] arr = new int[intSize];
    private static String[] sArr = new String[10];
    private static Random random = new Random();

    public static String randomString(){
        char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < 10; i++) {
            char c = chars[random.nextInt(chars.length)];
            sb.append(c);
        }
        String output = sb.toString();

        return output;
    }

    public static int randomInteger(){

        int temp = 0;
        for (int i = 0; i<arr.length; i++){
            temp = random.nextInt(arr.length*10);
        }

        return temp;
    }

    public static double getIntSelectionSortTime(){

        for (int i = 0; i < 10; i++){
            arr[i] = randomInteger();
        }

        System.out.println("Before:"+Arrays.toString(arr));
        long startTime = System.nanoTime();
        int[] temp = SortingAlgorithms.insertionSort(arr);
        long endTime = System.nanoTime();
        System.out.println("After: "+Arrays.toString(temp));
        double sec = (double) endTime - startTime/1000000000.0;

        return sec;
    }

    public static double getStringSelectionSortTime(){

        for (int j = 0; j < 10; j ++){
            sArr[j] = randomString();
        }

        System.out.println("Before: "+Arrays.toString(sArr));
        long startTime = System.nanoTime();
        String[] temp = SortingAlgorithms.insertionSort(sArr);
        long endTime = System.nanoTime();
        double sec2 = (double) endTime - startTime/1000000000.0;

        System.out.println("After: "+Arrays.toString(temp));

        return sec2;
    }

    public static double getIntMergeSortTime(){

        for (int i = 0; i < 5; i++){
            arr[i] = randomInteger();
        }

        System.out.println("Before:"+Arrays.toString(arr));
        long startTime2 = System.nanoTime();
        int[] temp = SortingAlgorithms.insertionSort(arr);
        long endTime2 = System.nanoTime();
        System.out.println("After: "+Arrays.toString(temp));
        double sec2 = (double) endTime2 - startTime2/1000000000.0;

        return sec2;
    }

    public static double getStringMergeSortTime(){

        for (int j = 0; j < 10; j ++){
            sArr[j] = randomString();
        }

        System.out.println("Before: "+Arrays.toString(sArr));
        long startTime2 = System.nanoTime();
        String[] temp = SortingAlgorithms.insertionSort(sArr);
        long endTime2 = System.nanoTime();
        double sec3 = (double) endTime2 - startTime2/1000000000.0;

        System.out.println("After: "+Arrays.toString(temp));

        return sec3;
    }

    public static void main(String[] args) {

        System.out.println("Selection Sort integer ");
        System.out.println("Measured time: "+getIntSelectionSortTime()+" seconds");
        System.out.println("Selection Sort string ");
        System.out.println("Measured time: "+getStringSelectionSortTime()+" seconds");
        System.out.println("Merge Sort integer ");
        System.out.println("Measured time: "+getIntMergeSortTime()+" seconds");
        System.out.println("Merge Sort string ");
        System.out.println("Measured time: "+getStringMergeSortTime()+" seconds");
    }

}