Java Read Each Line Into Separate ArrayList (String)

Question

Is it posible to put eachline (from txt file) to sepperate arraylist etc and put them incide Array DATABASE

I have a file with info of students something like that

Name Lastname yearsOld address BEN DDD 12 14Drive Olga Benar 12 23Ave

So in result I would have an ArrayLIST with arraylist(of each student)?

What do you want to occupy the arraylist of students, strings with their information? — Kyle Spencer
– Kyle Spencer, Commented Mar 30, 2014 at 23:27
I have a txt file with each line has student info Later on I need to search them using contains method (so I was going to put each student int o seperat arrayList and into one ArrayList where all students are) — user3191018
– user3191018, Commented Mar 30, 2014 at 23:29
I'm looking for same thing but in STRING stackoverflow.com/questions/12523497/… — user3191018
– user3191018, Commented Mar 30, 2014 at 23:34

ssnielsen · Accepted Answer · 2014-03-31 00:38:31Z

1

How about creating a model of your data? E.g:

class Student {
    String name;
    String lastname;
    int yearsOld;
    ...more fields...
}

And use that to load your data into an ArrayList<Student>.

EDIT: However, to answer your question. Use the IO library to read the file line by line:

public List<List<String>> processFile(String file) throws IOException {      
    List<List<String>> data = new ArrayList<List<String>>();
    BufferedReader br = new BufferedReader(new FileReader(file));
    String line;
    while ((line = br.readLine()) != null) {
       data.add(processLine(line));
    }
    br.close();
    return data;
}

public List<String> processLine(String line) {
    return Arrays.asList(line.split(" ")); //  Be aware of spaces in names, addresses etc.
}

edited Mar 31, 2014 at 0:38

answered Mar 30, 2014 at 23:28

ssnielsen

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3 Comments

user3191018 Over a year ago

but how do I put each line into seperate arraylist?

user3191018 Over a year ago

I belive there is suntax error somewhere... cant work

Alan Over a year ago

This is object oriented programming. Store in your arraylist objects of type Student as suggested. Then you can iterate over the arraylist and discover the details as required.

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