將整數數組存儲到列表整數數組中並按順序訪問這些變量

Question

好吧，我有這段代碼，我想將整數數組的值存儲在twholef [x]中，並將這些值存儲在數組wholelist [ Y]。唯一的問題是，我設置的方式是，取數組的前三個值並將它們存儲在intwholef [x]中，然後在下一行傳遞時重置x。的圖形表示低於

這是文件存儲在字符串

intwholef[0] = 1 3 10 
intwholef[1] = 2 4 15 
intwholef[2] = 3 6 8 
intwholef[3] = 4 7 3 
intwholef[4] = 5 9 12 

的數組的內容現在我想是要被存儲這樣這些值。

wholelist[] = 1,3,10,2,4,15,3,6,8,4,7,3,5,9,12 

並像

wholelist[2] * wholelist[5] = 150; 

，即時通訊運行到的是，即時通訊無法保存在這樣的列表中的值，任何想法的問題訪問？

這裏是整個代碼，部分IM談論的是在底部

import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.IOException; 
import java.util.Scanner; 

public class project1 
{ 
    @SuppressWarnings("null") 
    public static void main(String[] args) 
    { 
     System.out.println("These are your following choices: "); 
     System.out.println("1. First-Come First-Served (FCFS): "); 
     System.out.println("2. Shortest Job Next (SJN): "); 
     System.out.println("3. Shortest Remaining Time (SRT): "); 
     System.out.println("4. Round Robin (RR) with time quantum = 4 ms: "); 
     System.out.println("please enter your choice by entering 1, 2, 3, 4"); 
     Scanner in = new Scanner(System.in); 
     int choice = in.nextInt(); 
     if(choice ==1) 
     { 
      System.out.println("your choice was first come first serve"); 
     } 
     else if(choice == 2) 
     { 
      System.out.println("your choice was shortest job next"); 
     } 
     else if(choice == 3) 
     { 
      System.out.println("your choice was shortest job remaining"); 
     } 
     else if(choice == 4) 
     { 
      System.out.println("your choice was round robin (rr) with time quantum = 4 ms"); 
     } 
     else 
     { 
      System.out.println("you entered an invalid choice"); 
     } 
     BufferedReader file = null; 

     System.out.println("Please enter the file path for your input"); 
     Scanner fp = new Scanner(System.in); 
     String input = fp.nextLine(); 
     String fileloc; 
     String[] wholef = null; 
     int fline = 0; 
     try 
     { 
      file = new BufferedReader(new FileReader(input)); 
      fileloc = file.readLine(); 
      fline = Integer.parseInt(fileloc); // this stands for file contents from the file to be read 
      wholef = new String[fline]; 
      int i = 0; 
      while((fileloc = file.readLine()) != null) 
      { 
       wholef[i] = fileloc; 
       System.out.print("the contents of this file are: "); 
       System.out.println(fileloc); 
       i++; 
      } 
     System.out.println("This is the contents of the file stored in an array of strings"); 
     for(int n = 0; n < fline; n++) 
     { 
      System.out.println(wholef[n]); 
     } 
     } catch (IOException er) 
     { 
      er.printStackTrace(); 
     } 
     finally 
     { 
     try 
     { 
      if(file != null) 
      { 
       file.close(); 
      } 
     } catch(IOException erx) 
     { 
      erx.printStackTrace(); 
     } 
     } 

     System.out.println("This is the size of the contents of the file"); 
     for(int n = 0; n < fline; n++) 
     { 
      System.out.println(wholef[n].length()); 
     } 

     System.out.println("this is the input file converted and stored into an array of integers"); 

     String[] parts = null; 
     int[] intwholef = null; 
     int[] wholelist =null; 
     for(int x = 0; x < fline; x++) 
     { 
      parts = wholef[x].split(" "); 

      intwholef= new int[parts.length]; 

      for(int n = 0; n < parts.length; n++) 
      { 
       intwholef[n] = Integer.parseInt(parts[n]); 
       System.out.println(/*"intwholef[" + n + "] = " + */intwholef[n]); 
       for(int m = 0; m < parts.length; m++) 
       { 
        //wholelist[m]= intwholef[n]; 
       } 
      } 
     } 

     System.out.println("this is the list of number from the conversion dumped into a singular array list"); 

     for(int i = 0; i < 15; i++) 
     { 
      System.out.println("intwholef[" + i + "] = " + wholelist[i]); 
     } 
     /* 
     System.out.println("operations done with array of ints"); 
     for(int i = 0; i < 20; i++) 
     { 
      System.out.println(intwholef[i]); 
     } 
     //System.out.println(intwholef[0] * intwholef[3]); 
     */ 

    } 
} 

Answer 1

我建議你使用，而不是一個數組作爲它的大小可以改變一個列表（如ArrayList）。因此：

ArrayList wholeList = new ArrayList<Integer>(); 
for(int x = 0; x < fline; x++) 
    { 
     parts = wholef[x].split(" "); 
     for(int n = 0; n < parts.length; n++) 
     { 
      wholeList.add(Integer.parseInt(parts[n])); 
     } 
    } 

然後，您可以使用wholeList.get(index)訪問不同的值。

Answer 2

你可以簡單地使用ArrayList來完成。如果你想結束一個數組，使用toString方法。將字符串拆分爲\\s，以便任何空格都可以用作分隔符。此外，您只需要只循環，就像這樣：

int[] myArray = new int[10]; 
    List<Integer> list = new ArrayList<Integer>(); 
    while ((fileloc = file.readLine()) != null) { 
     for (String s : fileloc.split("\\s+")) { 
      list.add(Integer.parseInt(s)); 
     } 
     System.out.println(Arrays.toString(myArray)); 
    } 
    int[] wholelist = list.toArray();