所以我需要创建一个程序来读取包含文本的文件,然后为每一行添加行号。到目前为止,我打印出行号,但不是只打印每行,而是打印每行中的所有文本。我怎么才能把它打印出去?
这是我到目前为止的代码:
public static void main(String[] args) throws FileNotFoundException {
try {
ArrayList<String> poem = readPoem("src\\P7_2\\input.txt");
number("output.txt",poem);
}catch(Exception e){
System.out.println("File not found.");
}
}
public static ArrayList<String> readPoem(String filename) throws FileNotFoundException {
ArrayList<String> lineList = new ArrayList<String>();
Scanner in = new Scanner(new File(filename));
while (in.hasNextLine()) {
lineList.add(in.nextLine());
}
in.close();
return lineList;
}
public static void number (String filename,ArrayList<String> lines) throws FileNotFoundException{
PrintWriter out = new PrintWriter(filename);
for(int i = 0; i<lines.size(); i++){
out.println("/* " + i + "*/" + lines);
}
out.close();
}
答案 0 :(得分:1)
以下是使用Java 7提供的新功能的程序的简短版本;它假设你有一个足够短的源文件:
final Charset charset = StandardCharsets.UTF_8;
final String lineSeparator = System.lineSeparator();
final Path src = Paths.get("src\\P7_2\\input.txt");
final Path dst = Paths.get("output.txt");
try (
final BufferedWriter writer = Files.newBufferedWriter(src, charset, StandardOpenOption.CREATE);
) {
int lineNumber = 1;
for (final String line: Files.readAllLines(src, charset))
writer.write(String.format("/* %d */ %s%s", lineNumber++, line, lineSeparator));
writer.flush();
}
答案 1 :(得分:0)
使用
out.println("/* " + i + "*/" + lines.get(i));
取代
out.println("/* " + i + "*/" + lines);
您正在每行打印完整列表。
答案 2 :(得分:0)
我会说这是你的问题:
out.println("/* " + i + "*/" + lines);
//this prints all the lines each loop execution
您可以尝试使用:
int i = 1; //or the first value you wish
for(String a : lines){
out.println("/* " + i + "*/" + a);
i++;
}