从Java中的文件读取数据 [英] read data from a file in java

问题描述

我有一个以下格式的文本文件:

I have a text file in the following format:

Details.txt

该文件是.txt文件.我想从该文件中读取课程标题，并打印相应的教科书和教师信息.但是我不确定该遵循什么程序?将信息存储在数组中效率不高！我应该如何进行?注意:我无法更改文件中的信息，因此不应更改！显然，文件将通过以下代码读取:

The file is a .txt file. I want to read course title from this file and print corresponding textbook and instructor information. But i am not sure about what process to follow ? storing the information in an array won't be efficient! How should i proceed ? NOTE: I can't change the info in the file, it should not be changed!! obviously the file will be read by the following code:

File newFile=new File("C:/details");

但是我应该如何根据课程标题，教科书和讲师的标签从该文件中提取数据！

but how should i extract the data from this file according to the labels course title, textbook and instructor!?

推荐答案

1. 首先正确逐行读取文件，然后搜索您输入的课程标题，让我们考虑"Java"

1. First read the file correctly line by line, and search for your entered course title, lets consider "Java"

现在您点击了标题，并且知道与该标题相关的所有信息都在文件中需要连续3行.

Now you hit your title and you know you need 3 consecutive lines from your file as all information related to that title are there.

if(str.startsWith(title)); {  // for title = "Java"
  line1 = 1st line  // contains ISBN and First Name
  line2 = 2nd line  // Title and Last Name
  line3 = 3rd line  // Author and Department
  line4 = 4th line  // Email
  break;  // this will take you out of while loop
}

现在，在这四行上执行字符串操作并根据需要提取并使用数据.

Now on those four lines do string operations and extract your data as you need and use it.

我在家，所以我不能给你确切的密码.但是，如果您遵循此步骤，则可以解决您的问题.让我知道您在执行此操作时是否遇到任何问题.

I am home so I can't give you exact code. But if you follow this it will solve your issue. Let me know if any problem you got while doing this.

遵循此步骤以获取有关String操作的一些信息

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