09-09-2008, 02:04 AM
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How do you Assign lines of a file to an aaraylist
If i have a file which contains some data..and say that i want to assign the values of every other line in the file to an arraylist of objects. How do you do it please? Thanx in advance...
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09-09-2008, 01:19 PM
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Re: How do you Assign lines of a file to an aaraylist
Hello nadman123.
Welcome to the Java Programming Forums! What type of file are you talking about? Is it a .txt file? To start, id read in the file line by line. You can find out exactly how to do this here: How to Read a file line by line You can then add the strLine String to an arraylist. Have you coded anything so far? Please post what you have here and we will help you fill in the gaps. If not, post an example of the data file and I will see what I can do.
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09-09-2008, 10:25 PM
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Re: How do you Assign lines of a file to an aaraylist
Quote:
Quote:
In the student class there are methods called setName, getName, setAddress, getAddres...and so on..you know the accessors and mutators with default constructor and the constructor... I know how to create an arraylist not from a file though. like Java Code:
private ArrayList<Student> students;
students = new ArrayList<Student>();
generateStudents();
private void generateStudents(){
students.add(new Student("John Smith", "19999999","100 Dandenong Road, Caulfield East, Vic 3145","0-99112233" ));
.............
............
...........
so on.....
}
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15-09-2008, 06:07 PM
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Re: How do you Assign lines of a file to an aaraylist
This should get you started..
The code below will read in a file line by line and grab the first line which tells you the number of students. You just need to add the ArrayList & methods. Java Code:
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
public class Class1 {
public static int numberOfStudents;
public static void main(String[] args) {
try
{
FileInputStream in = new FileInputStream("students.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read first line to isolate the number of students & convert String to int.
String strNumberOfStudents = br.readLine();
int numberOfStudents = Integer.parseInt(strNumberOfStudents);
//Print number of students first line.
System.out.println(numberOfStudents);
while((strLine = br.readLine())!= null)
{
// Print each line. Put arraylist add here
System.out.println(strLine);
}
}catch(Exception e){
System.out.println(e);
}
}
}
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