Java:无法将 ArrayList<Long> 写入文本文件

Question

我将 size_list 定义为 Long 的 ArrayList。我已经import java.io.*;了。不知何故，以下仍然给我一个错误。我正在做与我遇到的其他帖子相同的事情。有人出了什么问题吗？

    ArrayList<Long> size_list = some_method();
    try{
        FileWriter fileWriter = new FileWriter("results.txt");
        BufferedWriter out = new BufferedWriter(fileWriter);
        for(int i = 0; i < size_list.size(); i++ ){
            out.write(size_list.get(i));
            out.newline();
        }
        out.close();
    } catch(IOException ex){
        System.out.println("Error writing to file " );
    }

我收到的错误消息:

 no suitable method found for write(Long)
                out.write(size_list.get(i));
                   ^
    method Writer.write(int) is not applicable
      (argument mismatch; Long cannot be converted to int)
    method Writer.write(char[]) is not applicable
      (argument mismatch; Long cannot be converted to char[])
    method Writer.write(String) is not applicable
      (argument mismatch; Long cannot be converted to String)
    method BufferedWriter.write(int) is not applicable
      (argument mismatch; Long cannot be converted to int)
SCCsAlgo.java:287: error: cannot find symbol
                out.newline();
                   ^
  symbol:   method newline()
  location: variable out of type BufferedWriter

Answer 1

out.write(size_list.get(i).toString());
out.newLine();

而不是

out.write(size_list.get(i));
out.newline();

Java 区分大小写。因此，在 BufferedWriter 中不再有写入 Long 的方法，也没有像 newline();

这样的方法