我尝试将类导入到此包但它不会编译 [英] L try to import class to this package but it wont compile

问题描述

我尝试遵守代码，但是有一个错误，并且我使用blue j和net bean编译器作为bleo代码导入到类

  import  java.text.DecimalFormat; 
  import  java.util.Random; 
 
  public   class  AverageSpeedOfStructures 
 {
  public   static   void  main（ String  args []）
 {
  //  创建一个ArrayClass对象 
 ArrayClass array =  new  ArrayClass（ 1000000 ）; 
 
  //  创建SingleLinkedList类对象 
 SingleLinkedList< Integer> ; sll =  new  SingleLinkedList< Integer>（）; 
 
  //  创建一个随机对象 
 Random rand = < span class =code-keyword> new  Random（）; 
 
  //  创建一个DecimalFormat对象 
 DecimalFormat form = < span class =code-keyword> new  DecimalFormat（  ##。####< /跨度>）; 
 
  //  声明所需的变量来计算和存储 
  double  totalofArray =  0 ; 
  double  totalofSLL =  0 ; 
  long  arrInsert，arrDelete，arrSearch; 
  long  sllInsert，sllDelete，sllSearch; 
  long  start，end; 
 
  //  查找插入方法所用时间的逻辑 
 start = System.nanoTime（）; 
  for （ int  i =  0 ; i<  1000000 ; i ++）
 {
 array.insert（rand.nextInt（ 1000 ））; 
} 
 end = System.nanoTime（）; 
 arrInsert = Math.abs（start  -  end）; 
 
  //  查找搜索方法所用时间的逻辑 
 start = System.nanoTime（）; 
 array.search（ 300 ）; 
 end = System.nanoTime（）; 
 arrSearch = Math.abs（start  -  end）; 
 
  //  查找删除方法所用时间的逻辑 
 start = System.nanoTime（）; 
 array.delete（ 300 ）; 
 end = System.nanoTime（）; 
 arrDelete = Math.abs（开始 - 结束）; 
 
  //   ArrayClass使用数组所花费的平均时间 
 totalofArray =（arrInsert + arrDelete + arrSearch）/  3 。 0 ; 
 
  //  单个链接列表速度 
  //  用于查找插入方法所用时间的逻辑 
 start = System.nanoTime（）; 
  for （ int  i =  0 ; i<  1000000 ; i ++）
 {
 sll.listInsert（rand.nextInt（ 1000 ））; 
} 
 end = System.nanoTime（）; 
 sllInsert = Math.abs（start  -  end）; 
 
  //  查找搜索方法所用时间的逻辑 
 start = System.nanoTime（）; 
 sll.listSearch（ 300 ）; 
 end = System.nanoTime（）; 
 sllSearch = Math.abs（开始 - 结束）; 
 
  //  查找删除方法所用时间的逻辑 
 start = System.nanoTime（）; 
 sll.listRemove（ 300 ）; 
 end = System.nanoTime（）; 
 sllDelete = Math.abs（开始 - 结束）; 
 
  //  单链表的平均时间 
 totalofSLL =（sllInsert + sllDelete + sllSearch）/  3 。 0 ; 
  //  打印速度比率 
 System.out 
 .println（ 未分类优化的平均速度比率 
 +  数组结构\ n \\ n 
 +  单链表结构为：\ n 
 + form.format（totalofArray）
 +  ： 
 + form.format（totalofSLL））; 
} 
} 

为什么会出错？



我尝试了什么：



l尝试从java导入这两个类但代码不会编译，错误在哪里？

解决方案

您还没有定义两个类 ArrayClass 和 SingleLinkedList< Integer>

l try to complies the code but there is an error and l did import to classes using both blue j and net bean compiler as bleo code

import java.text.DecimalFormat;
import java.util.Random;

public class AverageSpeedOfStructures
{
     public static void main(String args[])
     {
          //create a ArrayClass object
          ArrayClass array = new ArrayClass(1000000);
         
          //create a SingleLinkedList class object
          SingleLinkedList<Integer> sll = new SingleLinkedList<Integer>();
     
          //create a Random object
          Random rand = new Random();
        
          //create a DecimalFormat object
          DecimalFormat form = new DecimalFormat("##.####");
       
          //declare the required variables to calculate and store
          double totalofArray = 0;
          double totalofSLL = 0;
          long arrInsert, arrDelete, arrSearch;
          long sllInsert, sllDelete, sllSearch;
          long start, end;

          //logic to find the time taken by insert method
          start = System.nanoTime();
          for (int i = 0; i < 1000000; i++)
          {
              array.insert(rand.nextInt(1000));
          }
          end = System.nanoTime();
          arrInsert = Math.abs(start - end);
         
          //logic to find the time taken by search method
          start = System.nanoTime();
          array.search(300);
          end = System.nanoTime();
          arrSearch = Math.abs(start - end);
         
          //logic to find the time taken by delete method
          start = System.nanoTime();
          array.delete(300);
          end = System.nanoTime();
          arrDelete = Math.abs(start - end);
         
          //average time taken by the ArrayClass using arrays
          totalofArray = (arrInsert + arrDelete + arrSearch) / 3.0;

          // Single LinkedList speeds
          //logic to find the time taken by insert method
          start = System.nanoTime();
          for (int i = 0; i < 1000000; i++)
          {
              sll.listInsert(rand.nextInt(1000));
          }
          end = System.nanoTime();
          sllInsert = Math.abs(start - end);
         
          //logic to find the time taken by search method
          start = System.nanoTime();
          sll.listSearch(300);
          end = System.nanoTime();
          sllSearch = Math.abs(start - end);
         
          //logic to find the time taken by delete method
          start = System.nanoTime();
          sll.listRemove(300);
          end = System.nanoTime();
          sllDelete = Math.abs(start - end);

          //average time taken by the singly linked list
          totalofSLL = (sllInsert + sllDelete + sllSearch) / 3.0;
          //print the ratio of speeds
          System.out
                   .println("The ratio of averge speed of an Unsorted-Optimized"
                             + " array structure \nto the average speed of a"
                             + " Singly Linked List structure is: \n"
                             + form.format(totalofArray)
                             + " : "
                             + form.format(totalofSLL));
     }
}

why there is an error?

What I have tried:

l did try to import both classes form java but the code wont compile and where is the error ??

解决方案

You have not defined the two classes ArrayClass and SingleLinkedList<Integer>.

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