Question

我在使用I / O时遇到了一些麻烦。我有一个名为SongTextFileProcessor的类，它应该处理一个Song对象（在Song类中定义）与文件的读/写。这是我的写法：

@Override
public void writeSong(String songName, String fileName) 
{
    String [] songObject = songName.split(", ");
    Song s1 = new Song (songObject[0], songObject[1], songObject[2]);

    try
    {
    PrintWriter output = new PrintWriter (new File (fileName));
    output.print(s1.printSong());
    output.close();
    }
    catch (Exception e)
    {
        System.out.println("Exception caught.");
    }
}

我的阅读方法：

@Override
public void readSong(String fileName) 
{
    try
    {
    BufferedReader in = new BufferedReader(new FileReader(fileName));

    String line = null;
    while((line = in.readLine()) != null)   
    {
        System.out.println(line);
    }
    in.close();
    }

    catch (Exception e)
    {
        System.out.println("Exception caught.");
    }
}

但是，当我尝试使用以下代码从Test类调用这些方法时：

String songName = "Maad City, Kendrick Lamar, Hip-Hop";
String fileName = "songs.txt";

writeSong(songName, fileName);
readSong(fileName);

它给了我错误＆＃34;方法writeSong（String，String）未定义类型Test＆＃34;。这使我感到沮丧，因为我熟悉Java I / O，并且熟悉Java，当这两个方法都从Test类中调用时，它们完美地工作，这意味着问题必须在传递过程中SongTextFileProcessor中方法的参数。有什么想法吗？

这是歌曲课程：

public class Song 
{
private String title, artist, genre;

public String getTitle()
{
    return title;
}

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

public String getArtist() 
{
    return artist;
}

public void setArtist(String artist) 
{
    this.artist = artist;
}

public String getGenre() 
{
    return genre;
}

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

public Song(String title, String artist, String genre)
{
    this.title = title;
    this.artist = artist;
    this.genre = genre;
}

public String printSong()
{
    return (getTitle() + " by " + getArtist() + " is a " + getGenre() + " song.");
}
}

The readSong and writeSong methods are the only methods in the SongTextFileProcessor class, and both of those methods are defined by Interfaces. And i've shown all the code I have in the Test class.

Answer 1

在文本课中尝试：

    String songName = "Maad City, Kendrick Lamar, Hip-Hop";
    String fileName = "songs.txt";

    SongTextFileProcessor stfp = new SongTextFileProcessor ();

    stfp.writeSong(songName, fileName);
    stfp.readSong(fileName);

Java File I / O有问题吗？

1 个答案: