Question

我已经在一个txt文件中读入Arraylist来格式化它，然后将该列表读入一个Hashset以删除重复项。当我尝试写入txt文件时，它将所有值放在一行上。如果我尝试将ArrayList写入txt文件，它会分隔行。欢迎任何帮助

public static void main(String[] args)
{
 String filename = "data.txt";
 String filename_out = "output.txt";
 boolean dataRead;
 ArrayList<String> textFile = new ArrayList<String>();

try{

         Scanner datafile = new Scanner(new FileReader(filename));

        while(datafile.hasNext()) {
            //Scanner readIn = new Scanner(datafile.next());//.useDelimiter("[,;:.!? ]") ;

            textFile.add (datafile.next().replaceAll("\\p{Punct}|\\d","").toLowerCase().trim()); //reads next line, removes punctuation, sets to lowercase

    }

   // Collections.sort(textFile); // sort into alphabetical order
    datafile.close();
    dataRead = true;

}
 catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

ArrayList<String> dictionary = new ArrayList<String>();
Set<String> s = new HashSet<String>(textFile);
for (String eachString : s)
{
    dictionary.add(eachString);
}
Collections.sort(dictionary);
//System.out.println(dictionary);

try{
FileWriter fw = new FileWriter(filename_out);
Writer output = new BufferedWriter(fw);
int listSize = dictionary.size();
for (int i = 0; i < listSize; i++){
    output.write(dictionary.get(i).toString()+ "\n"); //this is where i think the problem is
}

output.close();
    } 
     catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }        

}

Answer 1

Windows使用\r\n

所以改变

output.write(dictionary.get(i).toString()+ "\n");

到

output.write(dictionary.get(i).toString()+ "\r\n");

Answer 2

使输出成为BufferedWriter并使用其newLine（）方法。

BufferedWriter output = new BufferedWriter(fw);

...
output.write(dictionary.get(i).toString());
output.newLine();
...

Answer 3

尝试这个

output.write(dictionary.get(i).toString()+System.getProperty("line.separator"));

在单独的行上打印字符串哈希集

3 个答案: