如何從文本文件中讀取數據並將其添加到鏈接列表

Question

我正在嘗試製作一個包含醫院患者列表的程序。 我想從文本文件讀取數據並將其添加到鏈接列表的第一個節點。

我很困惑我該如何讀取文本文件中的數據並將其添加到列表中。

這是我已經試過到目前爲止 我的病人類別：

public class Patient implements Serializable { 

private String name; 
private String patientIDNumber; 
private String address; 
private int height; 
private double weight; 


protected LLNode<Patient> head; 


public Patient(String n, String ID, String Ad, int h, double w) 
{ 
    name = n; 
    patientIDNumber = ID; 
    address = Ad; 
    height = h; 
    weight = w; 


} 

public String get_name() 
{ 
    return name; 
} 

public String get_patientIDNumber() 
{ 
    return patientIDNumber; 
} 

public String get_address() 
{ 
    return address; 
} 

public int get_height() 
{ 
    return height; 
} 

public double get_weight() 
{ 
    return weight; 
} 

public void set_name() 
{ 
    this.name = name; 
} 

public void set_patientIDNumber() 
{ 
    this.patientIDNumber = patientIDNumber; 
} 

public void set_address() 
{ 
    this.address = address; 
} 

public void set_height() 
{ 
    this.height = height; 
} 

public void set_weight() 
{ 
    this.weight = weight; 
} 

}

我的鏈表類：

public class PatientList<T> implements ListInterface<T>{ 

protected int numOfElements; 
protected LLNode<T> currentPos; 
protected boolean found; 
protected LLNode<T> location; 
protected LLNode<T> previous; 

protected LLNode<T> list; 
protected LLNode<T> tail; 

public PatientList() 
{ 
    numOfElements = 0; 
    list = null; 
    currentPos = null; 
} 

public void add(T element) 
{ 
    LLNode<T> newNode = new LLNode<T> (element); 
    newNode.setLink(list); 
    list = newNode; 
    numOfElements++; 
} 

protected void find(T target) 
{ 
    location = list; 
    found = false; 

    while(location != null) 
    { 
     if(location.getInfo().equals(target)) 
     { 
      found = true; 
      return; 
     } 
     else 
     { 
      previous = location; 
      location = location.getLink(); 
     } 
    } 
} 

public int size() 
{ 
    return numOfElements; 
} 

public boolean contains(T element) 
{ 
    find(element); 
    return found; 
} 

public boolean remove(T element) 
{ 
    find(element); 
    if(found) 
    { 
     if(list == location) 
      list = list.getLink(); 
     else 
      previous.setLink(location.getLink()); 

     numOfElements++; 
    } 
    return found; 
} 
public T get(T element) 
{ 
    find(element); 
    if(found) 
     return location.getInfo(); 
    else 
     return null; 
} 

public String toString() 
{ 
    LLNode currNode = list; 
    String listString = "List:\n"; 
    while(currNode != null) 
    { 
     listString = listString + " " + currNode.getInfo() + "\n"; 
     currNode = currNode.getLink(); 
    } 
    return listString; 
} 
public void reset() 
{ 
    currentPos = list; 
} 

public T getNext() 
{ 
    T next = currentPos.getInfo(); 
    if (currentPos.getLink() == null) 
     currentPos = list; 
    else 
     currentPos = currentPos.getLink(); 
    return next; 
} 

}

我的文本文件看起來像這個：

Random Name 
1024 
Random Ln NY 
70 
185 
Joe Smith 
1025 
134 Nowhere Lane New York NY 
80 
170 

我一直在試圖讀取這樣的數據：

import java.io.*; 
import java.util.*; 

public class PatientApplicationTester { 
    public static void main(String[] args) throws ClassNotFoundException 
    { 
     PatientList<Patient> list = new PatientList<Patient>(); 
     try { 
      File f = new File("Patients.txt"); 
      FileReader r = new FileReader(f); 
      BufferedReader reader = new BufferedReader(r); 

      String line = null; 

      while((line = reader.readLine()) != null) { 
       System.out.println(line); 

     } 
     reader.close(); 
    } catch(IOException e) { 
     e.printStackTrace(); 
    } 

} 

}

我知道這只是逐行讀取線，然後打印出來，我只是真的很困惑，我怎麼會去讀取數據，然後作爲Patient對象添加到鏈接列表中。任何幫助將不勝感激謝謝。

Answer 1

在你患者類添加它會在你的主要方法中使用的構造器：在main方法

public Patient() 
{ 

} 

在你PatientApplicationTester類替換爲以下代碼：

public static void main(String[] args) throws ClassNotFoundException 
    { 
     PatientList<Patient> list = new PatientList<Patient>(); 
     try { 
      File f = new File("Patients.txt"); 
      FileReader r = new FileReader(f); 
      BufferedReader reader = new BufferedReader(r); 

      String line = null; 
      Patient patient = new Patient(); // create Object use the constructor that I added. 
      int i = 1; // this variable is used to know on which line the reader is on 
      while((line = reader.readLine()) != null) 
      { 
       if(line.trim().equals("")) // if the line is a new line then add the previous patient to the list and create a new patient, re initialize i = 0 
       { 
        list.add(patient); 
        patient = new Patient(); 
        i = 1; 
       } 
       else 
       { 
        if(i == 1) // on first line of the file set the patients name 
        { 
         patient.set_name(line); 
        } 
        else if(i == 2)//on second line of the file set the patients ID Number 
        { 
         patient.set_patientIDNumber(line); 
        } 
        // add else if for other attributes on other lines 
        i++; 
       }  
      } 
      list.add(patient); 

      reader.close(); 

     }catch(IOException e) { 
      e.printStackTrace(); 
     } 
    } 

用分隔Patients.txt文件中的一個新行：

Random Name 
1024 
Random Ln NY 
70 
185 

Joe Smith 
1025 
134 Nowhere Lane New York NY 
80 
170 

在 患者類的setter方法是錯誤的，你需要的參數添加到它例如

最後

public void set_name(String name) 
{ 
    this.name = name; 
}