Java:关于写入的空白文件

Question

我正在尝试使用以下函数写入 Java 中的文件:

public void writeTextFile(String filename, double s){
  FileWriter output=null;
  try{
    output= new FileWriter(filename);
    BufferedWriter writer=new BufferedWriter(output);
    String ss = String.valueOf(s);
    writer.write(ss);
  } catch (Exception e) {
    throw new RuntimeException(e);
  } finally {
    if (output != null) {
      try {
        output.flush();
        output.close();
      } catch (IOException e) {

      }
    }
  }
}

我也尝试过使用:

FileOutputStream out;
PrintStream prt;
try{
  out= new FileOutputStream("result");
  prt=new PrintStream(out);
  prt.println(value);
  prt.flush();
  prt.close();
}
catch(Exception e){
  System.out.println("File write error");}

但是我最终使用这两种方法得到了一个空白的输出文件。需要帮助!!:(

Answer 1

这会起作用，

public void writeTextFile(String filename, double s){
 FileWriter output=null;
 try{
  output= new FileWriter(filename);
  BufferedWriter writer=new BufferedWriter(output);
  String ss = String.valueOf(s);
  writer.append(ss);
  writer.close();
} catch (Exception e) {
  throw new RuntimeException(e);
} finally {
  if (output != null) {
  try {
    output.flush();
    output.close();
  } catch (IOException e) {

  }
}
}
}