i have a txt file that contains the data to fill an array list of objects example of object:
public class Student implements Serializable
{
protected String name;
protected int number;
...
}
I have already implemented a method to read a text file that has the data necessary to create objects and fill an arraylist example of txt file:
Matt,5
John,9
...
After reading the txt file, and adding another Student to the arraylist, how do i update the txt file with the new Student?
Edit: code that i used to read from txt file
private ArrayList<Student> loadTextFileStudent(String filename) {
ArrayList<Student> students= new ArrayList();
File f = new File(filename);
if (f.exists() && f.isFile()) {
try {
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String line;
while ((line = br.readLine()) != null) {
String[] s = line.split(",");
if (s.length!=0) {
String name;
int number;
try
{
name= s[0];
number= Integer.parseInt(s[1]);
} catch (NumberFormatException e) {
System.out.println("Error");
name="";
number= 0;
}
Student temp=new Student(name,number);
students.add(temp);
}
}
br.close();
} catch (FileNotFoundException ex) {
System.out.println("Error opening file.");
} catch (IOException ex) {
System.out.println("Error reading file.");
} catch (Exception e) {
System.out.println("ERROR");
e.printStackTrace();
}
} else {
System.out.println("File not found.");
}
return students;
}
