java - 从文本文件填充 ArrayList 并删除所需输出中的正斜杠

嗨，SO专家，

第 1 步。我创建了一个 DVDInfo 类，它具有标题、流派、leadActor 以及各自的 getter 和 setter，如下面的代码所示。

问题:我必须从具有“正斜杠/”的 dvdInfo.txt 文件中填充一个 Arraylist，并且所需的输出应包含不带“正斜杠/”的 arrayList。

------------------------------------
       dvdInfo.txt file
------------------------------------

Donnie Darko/sci-fi/Gyllenhall, Jake
Raiders of the Lost Ark/action/Ford, Harrison
2001/sc-fi/??
Caddy Shack/comedy/Murray, Bill
Star Wars/sc-fi/Ford, Harrison
Lost in Translation/comedy/Murray, Bill
Patriot Games/action/Ford, Harrison

-------------------------------------


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

    class DVDInfo{
      private String title;
      private String genre;
      private String leadActor;

    DVDInfo(String t,String g,String a){
       this.title = t;
       this.genre =g;
       this.leadActor=a;
   }

   public String getTitle() {
     return title;
   }

   public void setTitle(String title) {
     this.title = title;
   }

   public String getGenre() {
      return genre;
   }

   public void setGenre(String genre) {
      this.genre = genre;
   }

   public String getLeadActor() {
    return leadActor;
   }

   public void setLeadActor(String leadActor) {
     this.leadActor = leadActor;
   }

   @Override
   public String toString() {
     return "DVDInfo [title=" + title + ", genre=" + genre + ", leadActor="
            + leadActor + "]";
   }

}

public class TestDVD {
    /*
     * //access dvdInfo.txt file and populate the arrayList by removing forward slash.
     */
    public static void populateList() throws Exception {
      BufferedReader br = new BufferedReader(new FileReader(new File("C:\\src\\dvdInfo.txt")));
      //read each line of dvdInfo.txt below
      String line=br.readLine();
      while(line !=null) {
          DVDInfo = new DVDInfo(t,g,a);
          // Step 1.Wanted to create a DVDInfo Instance for each line of data we read in from dvdInfo.txt file.//failed to do so
          // Step 2.for each DVDInfo Instance ,we need to parse the line of data and populate DVDInfo's 3 instance variables --no clue.
          // Step 3.Finally put all DVDInfo instances into the ArrayList--- i dont know how to proceed(no clue)
      }
    }


    public static void main(String[] args) {
        ArrayList<DVDInfo>  dvdList= new ArrayList<DVDInfo>();
        try{
            populateList();
        }catch(Exception e){
            System.out.println("Exception caught"+e.getMessage());
        }
        System.out.println(dvdList);
    }

}


  ------------------------------------------------------
  output of populateList should be without forward slash
  ------------------------------------------------------

  Donnie Darko sci-fi Gyllenhall, Jake
  Raiders of the Lost Ark action Ford, Harrison
  2001 sc-fi ??
  Caddy Shack comedy Murray, Bill
  Star Wars sc-fi Ford, Harrison
  Lost in Translation comedy Murray, Bill
  Patriot Games action Ford, Harrison

请帮助我使用 Java 1.5 版中 PopulateList 方法的代码，我对此很困惑。

感谢一切顺利!!!向所有 SO 专家欢呼。

最佳答案

populateList()

//Signature of method changed to add List<DVDInfo> as a parameter

    public static void populateList(List<DVDInfo> info) throws Exception {
            BufferedReader br = new BufferedReader(new FileReader(new File("C:\\src\\dvdInfo.txt")));
            //read each line of dvdInfo.txt below
             String line = null;
             while ((line = br.readLine()) != null) { //check line in loop
                String[] tokens = line.split("/");
                DVDInfo infoItem = new DVDInfo(tokens[0],tokens[1],tokens[2]);
                info.add(infoItem);
            }
          }

main()

//dvdList is now passed to the method.
public static void main(String[] args) {
    ArrayList<DVDInfo>  dvdList= new ArrayList<DVDInfo>();
    try{
        populateList(dvdList);
    }catch(Exception e){
        System.out.println("Exception caught"+e.getMessage());
    }
    System.out.println(dvdList);
}

无限循环问题

这部分代码会导致无限循环。

      String line=br.readLine();
      while(line !=null) {
          DVDInfo = new DVDInfo(t,g,a);

      }

这是因为从缓冲区读取一行，然后在该行不为空时执行循环。由于永远不会从缓冲区读取新行，因此该行永远不会为空，从而造成无限循环。这可以使用以下方法修复:

            String line = null;
            while ((line = br.readLine()) != null) { //check line in loop

            }

此循环构造将缓冲区中的行分配给 `Strin

关于java - 从文本文件填充 ArrayList 并删除所需输出中的正斜杠，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15473515/