Question

所以我这里有这个方法应该返回csv文件中的行数。很简单吧？事情是，而不是返回csv文件中的行数（在这种情况下为15）它返回66.老实说，我知道为什么会发生这种情况。我检查了csv文件，并确认它确实是15行，没有空行。也有人知道为什么我的Jpanes不显示没有这三行注释行，我的ide说变量没有在任何地方使用。

public static int getLineCount(){
    int line=0;
    try {
        Scanner inputStream = new Scanner(file);
        while (inputStream.hasNext()) {
            String data =inputStream.next();//this line is useless but the program doesn't display with out it
            String[] values = data.split(",");//this line is useless but the program doesn't display with out it
            i++;//this line is useless but the program doesn't display with out it
            line++;
        }
    }catch(FileNotFoundException e){
        e.printStackTrace();
    }
    return line;
}

Answer 1

使用BufferedReader而不是Scanner：

BufferedReader reader = new BufferedReader(new InputStreamReader(file));
while(reader.readLine() != null){
      line++;
}

Answer 2

public static int getLineCount(){
    String csvFilePath = "C:\\Users\\uzochi\\desktop\\txt.csv";
    String line = "";   
    int numberOfLines=0;
    try {
        BufferedReader br = new BufferedReader(new FileReader(csvFilePath));
        while (( line = br.readLine()) != null) {
        numberOfLines++;
        }
    }catch(FileNotFoundException e){
    //
    }catch (IOException ex) {
        //
    }
    return numberOfLines;
}

为什么我的方法返回66

2 个答案: