从文件读取信息到链接列表 [英] Reading information from a file to a linked list

问题描述

我已经获得了这段代码，用于从文件中读取信息并将其加载到链接的
节点列表.但是下面的代码崩溃了:-(

I''ve got this code for reading information from a file and load it into a linked
list of nodes. but the code below crashes :-(

if (btn == btnLoad)
		{
             try
             {
             	booklist.clear();
                BufferedReader reader = new BufferedReader(new FileReader("BOOKDATA.txt"));
                String line= reader.readLine();
                Books ObjBook = new Books();
                while(line!=null)
                  {
                  	 String[] ObjectArray =line.split(" ");
                  	 Books BookObject=new Books(ObjectArray[0],ObjectArray[1],Double.parseDouble(ObjectArray[2]),Integer.parseInt(ObjectArray[3]),Integer.parseInt(ObjectArray[4]),ObjectArray[5],ObjectArray[6],ObjectArray[7]);
             	     booklist.add(BookObject);
             	     line = reader.readLine();
                  }
                reader.close();
             
             }
             catch(EOFException eof)
             {
             	System.out.println("End of file");
             }
             catch(FileNotFoundException fnf)
             {
             	System.out.println("File Not Found");
             }
             catch(IOException error)
             {
             	System.out.println("IO error");
             }
        }

推荐答案

请确保首先从Object数组转换这些值，然后再使用它们-进行验证:

Please make sure to first convert those values from the Object array and afterwards to use them - with a validation:

// short form

Book oBook = new Book(
 value == null ? alternateValue:originalValue,
 args2,
 args3

);

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