reading text file and assigning strings from file to variables

Question

I have a few problems with my code. I want to be able to read input from a text file and take the strings from each line or between spaces and assign them to variables that I will pass to an object.

My first problem is that my program misreads one of my lines and omits the first letter from a variable, and the second problem is I don't know how to make my program read two strings on the same line and assign them to different variables.

    System.out.println("Input the file name of the text file you want to open:(remember .txt)");
    keyboard.nextLine();
    String filename=keyboard.nextLine();

    FileReader freader=new FileReader(filename);
    BufferedReader inputFile=new BufferedReader(freader);

    courseName=inputFile.readLine();

    while (inputFile.read()!= -1) {
        fName=inputFile.readLine(); 
        lName=inputFile.readLine();
        officeNumber=inputFile.readLine();
    }
    System.out.println(fName);
    Instructor inst=new Instructor(fName,lName,officeNumber);
    System.out.println(inst);
    inputFile.close();

}

I am not very good at using filereader and have tried to use the scanner keyboard method, but it lead me to even more errors :(

Output: Input from a file (F) or keyboard (K): F Input the file name of the text file you want to open: (remember .txt) test.txt un bun un bun won won's office number is null

text file: professor messor bun bun won won

nachokk · Accepted Answer · 2013-07-16 23:52:20Z

3

You have to read one line with readLine() then you say that you want to split with whitespace.

So you have to do something like this

    String line=null;
    List<Course> courses = new ArrayList<>();
        while ((line = inputFile.readLine())!= null) {
            String[] arrayLine= line.split("\\s+"); // here you are splitting with whitespace 
            courseName = arrayLine[0]
            lName=arrayLine[1];
            officeNumber=arrayLine[2];
            list.add(new Course(courseName,lName,officeNumber));   
          // you sure want do something with this create an object for example

        }

 // in some part br.close();

Here you have an example How to read a File

edited Jul 16, 2013 at 23:52

answered Jul 16, 2013 at 23:44

nachokk

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Vyassa Baratham · Accepted Answer · 2013-07-16 23:44:43Z

0

When you call read() in the condition of the while loop, the "cursor" of the BufferedReader advances one character. You don't want to do this to check if the stream can be read, you want to use the ready() method.

answered Jul 16, 2013 at 23:44

Vyassa Baratham

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nagendra547 · Accepted Answer · 2017-08-24 10:45:21Z

0

This is another solution using StringTokenizer

    String line=null;
    List<Course> courses = new ArrayList<>();
    while ((line = inputFile.readLine())!= null) {
       StringTokenizer sToken = new StringTokenizer(input, " ");
       list.add(new Course(sToken.nextToken(),sToken.nextToken(),sToken.nextToken())); 
    }

answered Aug 24, 2017 at 10:45

nagendra547

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