? StringWriter



public  class Fu {
 public static void main(String[] args){
  try(
   StringWriter load=new StringWriter())
  {
   load.write("符合,\n");
   load.write("工作量\n");
   load.write("装填");
   System.out.println(load);
  } catch (IOException ex) {
   ex.printStackTrace();
  }
 }
}

StringBuffer???

内容输入字符串???