將文件內容讀入循環鏈接列表

Question

我想弄清楚如何將.txt文件的內容放入循環鏈表中。內容可以隨機放置在列表中。是的，這是一項任務，但我完全陷入困境。對此，我真的非常感激。

public class DuckDuckGoose 
    { 

    private FileReader fr; 
    private Scanner sc; 

    /** 
    * openFile method to open the file, then invokes the method that reads it 
    * @param fileName name 
    * @throws FileNotFoundException 
    */ 
    public void openFile(String fileName) 
    { 
     try 
     { 
      fr = new FileReader(fileName); 
      sc = new Scanner(fr); 
      readAndSOPFile(); 
     } 
     catch (FileNotFoundException fnfe) 
     { 
      System.out.println("File not Found"); 
     } 
     catch (NoSuchElementException nsee) 
     { 
     System.out.println("No such element was found"); 
     } 
     catch (Exception e) 
     { 
     System.out.println("An exception occurred"); 
     } 
     finally 
     {   
     try 
     { 
      fr.close(); 
      sc.close();    
     } 
     catch (IOException ioe) 
     { 
      System.out.println("Cannot close the output file"); 
     } 
     catch (NullPointerException npe) 
     { 
      System.out.println("File was not created correctly"); 
     } 
     catch (Exception e) 
     { 
      System.out.println("An error occurred"); 
     } 

} 
} 

/** 
* readAndSOPFile reads each token and prints it to the console on a single line 
* @throws IllegalStateException 
* @throws NoSuchElementException 
*/ 
public void readAndSOPFile() throws IllegalStateException, NoSuchElementException 
{ 
    while (sc.hasNext()) 
    { 
     String s = sc.next(); 
     System.out.println(s);   
    } 
} 

public static void main(String[] args) 
{ 
    DuckDuckGoose ddg = new DuckDuckGoose(); 
    ddg.openFile("students.txt"); 

    LinkedList<String> ll = new LinkedList<String>(); 
    ListIterator<String> iter = ll.listIterator(); 


    } 

} 

Answer 1

試試這個，如果我理解正確的話。

public class DuckDuckGoose 
{ 

    private FileReader fr; 
    private Scanner sc; 

    public static void main(String[] args) 
    { 



     List<String> ll = new LinkedList<String>(); 
     ListIterator<String> iter = ll.listIterator(); 

     DuckDuckGoose ddg = new DuckDuckGoose(); 
     ddg.openFile("R.txt",ll); 


    } 

    /** 
    * openFile method to open the file, then invokes the method that reads it 
    * 
    * @param fileName name 
    * @param ll 
    * @throws FileNotFoundException 
    */ 
    public void openFile(String fileName, List<String> ll) 
    { 
     try 
     { 
      fr = new FileReader(fileName); 
      sc = new Scanner(fr); 
      readAndSOPFile(ll); 
     } 
     catch (FileNotFoundException fnfe) 
     { 
      System.out.println("File not Found"); 
     } 
     catch (NoSuchElementException nsee) 
     { 
      System.out.println("No such element was found"); 
     } 
     catch (Exception e) 
     { 
      System.out.println("An exception occurred"); 
     } 
     finally 
     { 
      try 
      { 
       fr.close(); 
       sc.close(); 
      } 
      catch (IOException ioe) 
      { 
       System.out.println("Cannot close the output file"); 
      } 
      catch (NullPointerException npe) 
      { 
       System.out.println("File was not created correctly"); 
      } 
      catch (Exception e) 
      { 
       System.out.println("An error occurred"); 
      } 

     } 
    } 

    /** 
    * readAndSOPFile reads each token and prints it to the console on a single line 
    * @throws IllegalStateException 
    * @throws NoSuchElementException 
    */ 
    public void readAndSOPFile(List<String> list) throws IllegalStateException, NoSuchElementException 
    { 
     while (sc.hasNext()) 
     { 
      String s = sc.next(); 
      list.add(s); 
      System.out.println(s); 
     } 
    } 

}